GB 16281-1996 Technical requirements and test methods for wired fire alarm dispatch console
Some standard content:
National Standard of the People's Republic of China
Wired Fire Alarm Dispatching Console
Technical requirenents and test methodsfor wired fire alarm dispatching console1 Subject content and scope of application
GB16281—1996
1.1 This standard specifies the product classification, technical requirements and test methods for wired fire alarm dispatching console, squadron fire alarm console and enterprise fire alarm dispatching console (hereinafter referred to as fire alarm dispatching console).
1.2 This standard applies to the wired fire alarm dispatching console installed in the communication command center of the public security fire brigade, the squadron fire alarm console installed in the squadron communication room, and also applies to the enterprise fire alarm dispatching console installed by the professional fire brigade of mining enterprises and institutions. 2 Reference standards
(B156 Rated voltage
GB2423.1 Japan
Basic environmental testing procedures for electric and electronic products Test A: Low temperature test method Basic environmental testing procedures for electric and electronic products GB 2423. 2
Test B: High temperature test method
(B2423.3 Basic environmental test procedures for electrical and electronic products Test Ca: Steady-state damp heat test method GB2423.5 Basic environmental test procedures for electrical and electronic products Test Ea: Impact test method GB6113 Electromagnetic interference measuring instrument
3 Terminology
3.1 Fire alarm relay door
The relay door in the fire alarm dispatch station connected to the 119 users of the city telephone exchange. 3.2 Ordinary relay door
The relay door in the fire repair dispatch station connected to the ordinary users of the city telephone exchange. 3.3 Dedicated line door
The direct line door in the fire dispatch station connected to the user's telephone User door. 3.4 Team production door
A direct user door connected to the team fire alarm station of the fire squadron and fed by the wired fire alarm dispatch station. 4 Product classification
4.1 According to its place of use, it can be divided into
4.1.1 Wired fire alarm dispatch station specially used in the communication command center of the public security fire brigade (personnel). 4.1.2 Team fire alarm station specially used in the communication room of the public security fire brigade. 4.1.3 Enterprise fire alarm dispatch station specially used by professional fire brigades in industrial and mining enterprises and institutions. Approved by the State Bureau of Technical Supervision on April 5, 1996 438
Implementation on November 1, 1996
5 Technical requirements
5.1 Basic parameters| |tt||5.1.1 The capacity of the fire alarm dispatch desk can be selected as follows: 4 doors 8 doors: 16 doors: 50 doors: 100 doors
5.1.2 Working voltage
G16281-1996
The AC working voltage of the fire alarm dispatch desk should be 220+18%V, and the DC working voltage should comply with the provisions of the national standard GB156 "Rated voltage". The following can be selected as follows: 24V; 48V. 5.2 Overall performance
5.2.1 The wired fire alarm dispatch desk should have fire alarm relay doors, ordinary relay doors, squadron user doors, and dedicated line user doors. 5.2.2 The squadron fire alarm desk should have fire alarm relay doors, ordinary relay doors, and dedicated line doors. 5.2.3 The enterprise fire alarm dispatch desk should have fire alarm relay door, ordinary relay door and dedicated line user door. 5.2.4 The fire alarm dispatch desk should have no less than two call lines. 5.2.5 The fire alarm relay door and ordinary relay door should be able to connect to the telephones in the corresponding cities. 5.2.6 The fire alarm dispatch desk should have automatic or manual control inspection performance for each fire alarm relay line fault (short circuit, open circuit); it can send out obvious and light signals in case of fault, and the sound signal will stop automatically after a delay of 10s, and the light signal should be maintained before the fault is eliminated; during the fault period, it will not affect the normal acceptance of fire alarms on the fault-free line.
5.2.7 During the acceptance of fire alarms, no sound shall be emitted when the non-fire alarm relay user door is open, but the incoming call light shall be on. 5.2.8 The fire alarm dispatch desk shall be able to cooperate with the telephone office to have the fire alarm reverse number query function. 5.2.9 The fire alarm dispatch desk and each door have the following operating functions. 5.2.9.1 When a call comes in from any of the fire alarm relay doors, ordinary relay doors, squadron user doors, and dedicated line user doors, and the dispatcher picks up the phone to answer, the fire alarm dispatch desk shall have the basic functions specified in Table 1. 5.2.9.2 When the dispatcher calls any of the ordinary relay doors, squadron user doors, and dedicated line user doors, and each user picks up the phone to answer, the fire alarm dispatch desk shall have the basic functions specified in Table 2.
5.2.10 The doors of the fire alarm dispatch desk can be interchanged when the basic functions of each door (i.e., sound, light, and call line) are met. 5.2.11 When a fire alarm is called in, the fire alarm dispatch desk can automatically memorize the alarm time of not less than two times, and can automatically display the alarm reception time until it disappears manually: during the alarm reception process, the alarm time should automatically return to the normal time after staying for 10s±1s. 5.2.12 The fire alarm station should have a loudspeaker output device of no less than 25W. The wired fire alarm dispatch station should have a loudspeaker input interface circuit and output one or two fire alarm recording signals. 5.2.13 When it is confirmed that the fire alarm signal is incoming, the fire alarm dispatch station should have: manual or automatic control output 2-way DC5V, 100mA; 2-way DC12V, 100mA; 1-way DC48V, 50mA interface circuit. 5.2.14 The wired fire alarm dispatch station should also have the following functions. 5.2.14.1 It can call out to any number of squadron user doors at the same time, and it can also call all; it can broadcast to several or all squadron user doors by wire. 5.2.14.2 When there is an incoming fire alarm signal, if two ropes are selected, in the same rope, when calling out one or several squadron user doors, the squadron user door that is called should be able to monitor the alarm situation. 439
Dispatcher
Off-hook answer
Dispatcher call
Off-hook answer
Incoming light
Nighttime lighting
Incoming light
Rope street light
Recording equipment
Rope street light
Belling light
Rope street light
Belling light
Calling light
GB162811996
Fire alarm relay
Continuous or flashing
Display alarm time
Auto start
Auto start
Restore to original state
Squadron user
Restore to original state
5.2.14.3 A wired fax machine interface is reserved. Squadron users
Continuous light
Manual start
Restore to original state
Special line users
Continuous or flashing
Manual start
Restore to original state
Special line users
Restore to original state
5.2.14.4 Under the control of the system computer, there is a data transmission interface between the dispatching dedicated line and the computer. Ordinary relay
Intermittent light
Restore to original state
Ordinary relay
Restore to original state
5.2.15 The power supply of the fire alarm dispatch desk should be AC and DC, and can be automatically converted. When the main power supply is cut off, it can automatically switch to the backup power supply; when the main power supply is restored, it can automatically switch to the main power supply. The main and backup power supplies should have working status indication and overcurrent protection measures, and both the main power supply and the backup power supply should have fault display. The capacity of the main power supply should be able to ensure that the fire alarm dispatch console can work continuously for 1 hour under the load conditions of half of the fire alarm relay incoming calls and calling half of the squadron users at the same time. When both the main and backup power supplies fail, the squadron fire alarm console should be able to receive the fire alarm incoming call signal.
5.3 Technical indicators
5.3.1 Line parameters
GB16281-1996
5.3.1.1 The maximum line resistance of the dedicated line is not less than 1ko (including the telephone) and the feeding current is not less than 18mA. 5.3.1.2 The insulation resistance between dedicated lines is not less than 20k0. 5.3.1.3 The capacitance between dedicated lines is not more than 0.5uF. 5.3.2 Transmission loss
5.3.2.1 The transmission loss of the dedicated line loop is not more than 1dB5.3.2.2 The transmission loss of the relay circuit is not more than 0.5dB. 5.3.3 Crosstalk loss
The crosstalk loss between any two pairs of adjacent call loops shall not be less than 70dB. 5.3.4 Unbalance to ground
The unbalanced loss of the call loop in the 300~600Hz cheek band shall not be less than 40dB, and the unbalanced loss in the 600-3400Hz frequency band shall not be less than}46dB.
5.3.5 Ringing current
5.3.5.1 The output voltage of the ringing current is 90±15V, and the frequency is 1650Hz. 5.3.5.2 The ringing current is divided into continuous ringing current and intermittent ringing current, and the intermittent time is 0.71.5s on and 3~5s off. 5.3.6 Buzzer
5.3.6.1 The frequency of the buzzer is 400±25Hz, and the power is not less than 50mW. 5.3.6.2 The buzzer sound is divided into continuous buzzer sound and intermittent buzzer sound. The intermittent buzzer sound has a duration of 0.7~1.5s send.0.7~1.55 off. 5.3.7 Simulcast level
When the simulcast circuit is fully loaded, the level of any user on the 600α impedance should not be less than 0dBmo when the frequency is 800±5Hz. 5.3.8 Loudspeaker amplifier characteristics
5.3.8.1 When the input frequency of the second line of the fire alarm relay is 800Hz and the level is -6.5dBmo, the output power shall not be less than 80mW. 5.3.8.2 Frequency characteristics
In the frequency band of 300~3400Hz, the variation is allowed to be ±3cB compared with the rated output level at 800Hz. 5.3.8.3 Distortion coefficient
The nonlinear distortion coefficient of the amplifier shall not exceed 10%. 5.3.9 The daily error of the timekeeping device shall not exceed 30s. 5.3.10 The delay after the alarm is automatically turned on is 10~30s (adjustable). 5.4 The fire alarm dispatch console shall be able to withstand the tests under the climatic conditions specified in Table 3, and the performance during and after the tests shall meet the requirements of the relevant tests in Chapter 6 of this standard.
5.5 The fire alarm dispatch console shall be able to withstand the tests under the mechanical impact conditions specified in Table 4, and the performance during and after the tests shall meet the requirements of the relevant tests in Chapter 6 of this standard.
5.6 The fire alarm dispatch console shall be able to withstand the tests under the electrical interference conditions specified in Table 5, and the performance during and after the tests shall meet the requirements of the relevant tests in Chapter 6 of this standard.
5.7 The dispatch console shall operate normally when the amplitude of the AC power supply voltage variation does not exceed 19% of the rated voltage (220V) and the frequency deviation does not exceed ±1% of the standard frequency (50Hz). 441
Test name
High temperature test
Low temperature test
High temperature storage test
Low temperature storage test
Steady-state damp heat test
Test name
Shock test
Test name
Radio electromagnetic field test
Power supply transient test
GB162811996
Test parameters
Burst time
Duration
Duration
Duration
Relative humidity
Duration
Test parameters
Acceleration
Pulse duration
Number of shocks
Test parameters
Frequency range
Power transient mode
Number of applications
Test conditions
Test conditions
Half sine wave
Test conditions
10 V/m
0. 1~150 MHz
Power on for 9s, power off for 1s
500 times
Working state
Normal monitoring state
Normal monitoring state
Non-working state
Normal monitoring state
Working state
Non-working state
Working state
Normal monitoring state
Normal monitoring state
5.8 The insulation resistance between the external live terminals with insulation requirements and the casing, and between the power plug (or power wiring terminal) and the casing of the fire alarm dispatch console shall be greater than 20M0 and 50MQ respectively under normal atmospheric conditions. The above-mentioned parts shall also be subjected to a withstand voltage test of 1500V (effective value, when the rated voltage exceeds 50V) or 500V (effective value, when the rated voltage does not exceed 50V) AC voltage for 1 minute according to the rated voltage. The performance during and after the test shall meet the requirements of the relevant tests in Chapter 6 of this standard. 5.9 The fire alarm dispatch console shall withstand the various tests specified in Chapter 6 of this standard and meet all the requirements of this standard. 5.10 Performance of main components
·General requirements
GB16281-1996
The main components of the fire alarm dispatch console shall adopt the finalized products that meet the relevant national standards and shall meet the requirements of the following relevant clauses. 5.10.2 Indicator lights
5.10.2.1 If tungsten filament bulbs are used, two lamps shall be operated in parallel, otherwise there shall be monitoring measures for filament breakage. 5.10.2.2 Under normal ambient light conditions, the indicator lights should be clearly visible at a distance of 3m. 5.10.2.3 All indicator lights should clearly indicate their functions. 5.10.3 Electromagnetic relays
5.10.3.1 The contacts shall adopt a double contact structure. 5.10.3.2 Non-enclosed relays shall be equipped with dust covers. 5.10.3.3 The internal and external circuits of the fire alarm dispatch console shall not be controlled by indirect contacts. 5.10.4 Transformers
The primary rated voltage of the transformer shall be below 300V, and the casing shall be equipped with a grounding terminal. 5.10.5 Electronic components
5.10.5.1 Three-proof (moisture-proof, mildew-proof, and salt spray-proof) treatment shall be carried out. 5.10.5.2 The parameters shall meet the requirements of the minimum working voltage and maximum working current. 5.10.6 Voltmeter
Indicating voltmeter··Generally, the voltage value to be indicated by the voltmeter should be about two-thirds of the full scale. 5.10.7 Terminals (rows)
Each terminal (row) should be clearly and firmly marked with its number or symbol, and its purpose should be explained in the relevant documents. 5.10.8 Switches and buttons
Switches and buttons should be sturdy and durable, and their functions should be clearly marked on them (or in a nearby position). The "vehicle alarm" (dispatch) button should have a special mark and have anti-misoperation measures. 6 Test method
6.1 General requirements for testing
6.1.1 The test procedure of the fire alarm dispatch console should be carried out in the order specified in Table 6. 6.1.2 The fire alarm dispatch console under test (hereinafter referred to as the sample) should be visually inspected before the test, and the test can be carried out only when it meets the following requirements.
Item No.
Table 6 Test procedure
Specimen No.
Test items
Main component inspection test
Basic function test
Technical index test
Power-on test
Power supply test
Electrical transient test
Insulation resistance test
Withstand voltage test
Item No.
GB 16281-1996
Continued Table 6
Test items
Radiated electromagnetic field test
High temperature test
Low temperature test
Impact test
Steady-state damp heat test
High temperature test
Low temperature storage test
Note: V indicates that the sample is subjected to the test of this item. a.
Sample number
There shall be no corrosion, peeling or blistering of the coating layer, or obvious mechanical damage such as scratches, cracks or burrs on the surface; the fastening parts shall not be loose and the control mechanism shall be flexible; the marking, numbering, text symbols and signs of all indicator lights, switches, buttons, terminals, etc. shall be clear. 6.1.3 If there is no explanation in the relevant clauses, all tests shall be carried out under the following normal atmospheric conditions. Air temperature: 15~35C;
Relative humidity: 45%~~75%;
Atmospheric pressure: 86~106kPa.
6.1.4 If there is no explanation in the relevant clauses, the tolerance of all test data shall be ±5%. 6.1.5 The number of samples for each batch of products shall not be less than 2 and shall be numbered before testing. 6.2 Inspection test of main components
6.2.1 Purpose
To inspect the performance of the main components of the fire alarm dispatch console. 6.2.2 Requirements
The performance of the main components of the fire alarm dispatch console shall meet the requirements of Article 5.10. 6.2.3 Methods
6.2.3.1 Check and record the function labeling of each switch and button of the sample. 6.2.3.2 Check and record the usage, visibility and function labeling of the indicator lights. 6.2.3.3 Check and record the function labeling of the terminal blocks. 6.3 Basic Function Test
6.3.1 Purpose
Check the basic functions of the fire alarm dispatch console.
6.3.2 Requirements
The basic functions of the fire alarm dispatch console shall meet the requirements of Article 5.2. 6.3.3 Method
6.3.3.1 According to the requirements of normal monitoring status, connect the fire alarm relay door of the sample to at least two magnetophones as fire alarm phones; connect the ordinary relay door to at least one magnetophone or directly connect to any program automatic switch user as ordinary phone; connect the squadron user door and the dedicated line user door to at least two automatic telephones as users. Turn on the power supply to put the sample in normal monitoring status. 6.3.3.2 Make one fire alarm relay line of the sample open or short circuit, and make the other fire alarm relay door simulate a fire alarm call. Observe the fault inspection, record the sound and light alarm signals, and observe the call of the sample. 6.3.3.3 For the test of the basic functions between the sample and each door, operate according to the provisions of Table 1 and Table 2, observe and record the sound and light monitoring signals and call conditions.
6.3.3.4 When simulating two fire alarms calling in at the same time and simulating more than two fire alarm signals calling in continuously, observe and record the timing, recording and call of the sample.
6.3.3.5 Simulate the operation of selective calling, full calling and broadcasting, and observe their working conditions. 6.3.3.6 Manually start the linkage control button of the sample, observe and record the control conditions of each channel. 6.3.3.7 Cut off the main power supply first, then restore it to normal, observe and record the conversion of the main power supply and backup power supply of the sample and the changes of the power indicator light.
6.3.3.8 Switch the main power supply to the backup power supply, and repeat the test process of 6.3.3.2~~6.3.3.6. 6.4 Technical index test
6.4.1 Purpose
Inspect the correctness of the technical index of the fire alarm dispatch console. 6.4.2 Requirements
The test results of the technical index of the sample should meet the requirements of 5.3.1~5.3.8. 6.4.3 Test the loop resistance of the Guangmen line for the squadron and dedicated line. 6.4.3.1 Test equipment
DC milliammeter: test range 1~100mA, accuracy 0.5 level. 6.4.3.2 Test method
The test circuit is shown in Figure 1.
Xin'an meter
In the figure: R is the maximum resistance of the loop.
User circuit
b. Put the user under test in the call state, close K, and make R=1kα, and the DC milliammeter reading should be no less than 18mA. 6.4.4 Test the insulation resistance and capacitance between the squadron user and the dedicated line user line. 6.4.4.1 Test equipment
Audio oscillator: balanced output, impedance is 0Q and 600Q. Frequency range: 300～3400Hz; output level range: 40~+20 dB.
Frequency-selective level meter: balanced input impedance is not less than 30kQ, frequency selection range: 20Hz～10kHz; frequency selectivity is not more than 8Hz, and the measurement level range is -80～+20dB.
Transfer coil: turns ratio 1:1, DC resistance is not more than 75α. 6.4.4.2 Test method
The test circuit is shown in Figure 2.
Transfer wire cabinet
GB16281-1996
In the figure: R1=R2=R3m R4R rated maximum loop resistance- 300 0+9%R5 20-*ako
C-0. 5*B, ns μF
C1-C2- 4+ 0. 4 μF
Guang Ningdian
hSet K to open and close t: K1, change the frequency of the audio oscillator output signal according to the test frequency, keep the output signal at 0dB, use the level meter to measure the output signal level of each frequency point, and record it in Table 7. Set K to close and repeat the test in item b.
6.4.5 Test transmission loss
6.4.5.1 Test equipment
F, Hz
Output 1
Output 2
Audio oscillator, frequency selection level meter, transfer coil: Same as 6.4.4.1. 1200
Balanced variable attenuator: Frequency range: 300-3400Hz; Attenuation value 0~100dB; Error ±0.02dB, Characteristic impedance 60006.4.5.2 Test method
The test line is shown in Figure 3.
Connect any loop to the dispatcher's telephone circuit, adjust the audio oscillator to output a signal with a frequency of 800Hz and a level of 0dBno.
Set switches K1 and K2 to the measured call loop -, and take the frequency selection level meter reading U1 (when the frequency selection is 800H2); then, set switches K1K2 to one side of the balanced attenuator, and adjust the attenuator to make the frequency selection level meter reading U2 - U1. The attenuator reading at this time is the transmission attenuation of the measured call loop. 446
Transfer coil
In the figure: R1-R2=R3=R4300±10Www.bzxZ.net
R5=R6=600±50
C1=C2=4±0. 4 μF
6.4.6 Test crosstalk attenuation
6.4.6.1 Test equipment
GB 16281--1996
Audio oscillator, balanced variable attenuator, transfer coil: Same as 6.4.4.1. a
Frequency-selective level meter: Balanced input, impedance not less than 30kQ, balance not less than 66dB, frequency range: 15Hz～200kHz, frequency selectivity not more than 8Hz, sensitivity -120dB, internal self-distortion attenuation should be no more than 80dB. 6.4.6.2 Test method
8. The test circuit is shown in Figure 4.
Transfer coil
In the figure: R1=R2R3=R4=300±10
R5=R6R7=R8-600±50
C1=C2=4±0.4μF
GB16281-1996
Talk circuit
bSelect two adjacent loops at random and connect them with the operator circuit to form a talk loop, as the main series talk loop and the series talk loop, and connect 600Q resistors to the terminals of the main and series loops respectively. Place switch K on the balanced attenuator side, adjust the balanced attenuator to 0 dB, adjust the audio oscillator output (frequency is c.
1100Hz, output impedance is 0Q), so that the frequency selection table reading is 11.4dBmo. d. Place switch K on the side of the loop being tested, read the value of the frequency-selective level meter as U1, and then place K on the side of the balanced variable attenuator. At this time, adjust the attenuator so that the value of the frequency-selective level meter U2=U1, and the value of the variable attenuator is the crosstalk attenuation between the two adjacent call loops being tested.
6.4.7, Test the unbalanced degree to ground
6.4.7.1 Test equipment
Audio oscillator, frequency-selective level meter, same as 6.4.4.1. 6.4.7.2 Test method
The test circuit is shown in Figure 5.
Audio oscillator
Figure: R1R2-R3=R30010
C1C2-100±10 μF
C3C4 4 +0. 1 μF
GB 16281-1996
Any squadron user (or dedicated line user) and the operator circuit form a call loop. h.
Set switches K1 and K2 to 1, change the frequency of the audio oscillator output signal according to the test frequency, keep the output signal at 0dB, turn K3 and use the frequency-selective level meter to measure the unbalanced attenuation value of the resistance bridge of the test system in the 300～3400Hz band when it is grounded or not grounded at point A. Both should be no less than 66dB. Fill in the test results in Table 6.3 respectively. d. Leave switches K1 and K2 at 2 and cut off the external line of the call loop. Change the frequency of the audio oscillator output signal according to the test frequency, keep the output signal at 0dB, turn the switch K3, and measure the unbalanced attenuation value of point A grounded and ungrounded at each test frequency. Fill in the test results in Table 8. Table 8
K12 set to 1 terminal
K1K22 terminal
Unbalance
Unbalance
6.4.8 Test ringing current
6.4.8.1 Test equipment
Ungrounded
Ungrounded
16002000
AC ammeter: Measurement range: 1~200V, error not more than 2%, input impedance not less than 100k0, should be able to measure the effective value of the signal voltage of 15~60Hz
Digital frequency meter: Measurement frequency range: 10~100Hz, error not more than ±0.1Hz. Measuring time instrument: can measure the duration of pulses, the interval between step pulses, etc. The measuring time range is 10ms to 10s, and the measuring error is not more than 1ms.
6.4.8.2 Test method
The test circuit is shown in Figure 6.5Simulate the operation of selective calling, general calling and broadcasting, and observe their working conditions. 6.3.3.6Manually start the linkage control button of the sample, observe and record the control conditions of each channel. 6.3.3.7 Cut off the main power supply first, then restore it to normal, observe and record the conversion of the main power supply and backup power supply of the sample and the changes of the power indicator light.
6.3.3.8 Switch the main power supply to the backup power supply, and repeat the test process of 6.3.3.2~~6.3.3.6. 6.4 Technical index test
6.4.1 Purpose
To check the correctness of the technical indicators of the fire alarm dispatch console. 6.4.2 Requirements
The test results of the technical indicators of the sample should meet the requirements of 5.3.1~5.3.8. 6.4.3 Test the loop resistance of the wide-gate line for squadrons and dedicated lines. 6.4.3.1 Test equipment
DC milliammeter: test range 1～100mA, accuracy 0.5 level. 6.4.3.2 Test method
The test circuit is shown in Figure 1.
Xin'an meter
In the figure: R is the maximum resistance of the loop.
User circuit
b. Put the user under test in the call state, close K, and make R=1kα, and the recorded DC milliammeter reading should be no less than 18mA. 6.4.4 Test the insulation resistance and capacitance between the squadron user and the dedicated line user line. 6.4.4.1 Test equipment
Audio oscillator: balanced output, impedance is 0Q and 600Q. Frequency range: 300～3400Hz; output level range: 40~+20 dB.
Frequency-selective level meter: balanced input impedance not less than 30kΩ, frequency-selective range: 20Hz～10kHz; frequency selectivity not greater than 8Hz, measurement level range: -80～+20dB.
Transmission coil: turns ratio 1:1, DC resistance not greater than 75α. 6.4.4.2 Test method
The physical test circuit is shown in Figure 2.
Transfer wire cabinet
GB16281-1996
In the figure: R1=R2=R3m R4R rated maximum loop resistance - 300 0+9%R5 20-*ako
C-0. 5*B, ns μF
C1-C2- 4+ 0. 4 μF
Guang Ningdian
hPut K in open and close positions t:K1, change the frequency of the audio oscillator output signal according to the test frequency, keep the output signal at 0dB, use the level meter to measure the output signal level of each frequency point, and record it in Table 7. Put K in close position and repeat the test b.
6.4.5 Test transmission loss
6.4.5.1 Test equipment
F, Hz
Output 1
Output 2
Audio oscillator, frequency selection level meter, transfer coil: Same as 6.4.4.1. 1200
Balanced variable attenuator: Frequency range: 300-3400Hz; Attenuation value 0~100dB; Error ±0.02dB, Characteristic impedance 60006.4.5.2 Test method
The test line is shown in Figure 3.
Connect any loop to the dispatcher's telephone circuit, adjust the audio oscillator to output a signal with a frequency of 800Hz and a level of 0dBno.
Set switches K1 and K2 to the measured call loop -, and take the frequency selection level meter reading U1 (when the frequency selection is 800H2); then, set switches K1K2 to one side of the balanced attenuator, and adjust the attenuator to make the frequency selection level meter reading U2 - U1. The attenuator reading at this time is the transmission attenuation of the measured call loop. 446
Transfer coil
In the figure: R1-R2=R3=R4300±10
R5=R6=600±50
C1=C2=4±0. 4 μF
6.4.6 Test crosstalk attenuation
6.4.6.1 Test equipment
GB 16281--1996
Audio oscillator, balanced variable attenuator, transfer coil: Same as 6.4.4.1. a
Frequency-selective level meter: Balanced input, impedance not less than 30kQ, balance not less than 66dB, frequency range: 15Hz～200kHz, frequency selectivity not more than 8Hz, sensitivity -120dB, internal self-distortion attenuation should be no more than 80dB. 6.4.6.2 Test method
8. The test circuit is shown in Figure 4.
Transfer coil
In the figure: R1=R2R3=R4=300±10
R5=R6R7=R8-600±50
C1=C2=4±0.4μF
GB16281-1996
Talk circuit
bSelect two adjacent loops at random and connect them with the operator circuit to form a talk loop, as the main series talk loop and the series talk loop, and connect 600Q resistors to the terminals of the main and series loops respectively. Place switch K on the balanced attenuator side, adjust the balanced attenuator to 0 dB, adjust the audio oscillator output (frequency is c.
1100Hz, output impedance is 0Q), so that the frequency selection table reading is 11.4dBmo. d. Place switch K on the side of the loop being tested, read the value of the frequency-selective level meter as U1, and then place K on the side of the balanced variable attenuator. At this time, adjust the attenuator so that the value of the frequency-selective level meter U2=U1, and the value of the variable attenuator is the crosstalk attenuation between the two adjacent call loops being tested.
6.4.7, Test the unbalanced degree to ground
6.4.7.1 Test equipment
Audio oscillator, frequency-selective level meter, same as 6.4.4.1. 6.4.7.2 Test method
The test circuit is shown in Figure 5.
Audio oscillator
Figure: R1R2-R3=R30010
C1C2-100±10 μF
C3C4 4 +0. 1 μF
GB 16281-1996
Any squadron user (or dedicated line user) and the operator circuit form a call loop. h.
Set switches K1 and K2 to 1, change the frequency of the audio oscillator output signal according to the test frequency, keep the output signal at 0dB, turn K3 and use the frequency-selective level meter to measure the unbalanced attenuation value of the resistance bridge of the test system in the 300～3400Hz band when it is grounded or not grounded at point A. Both should be no less than 66dB. Fill in the test results in Table 6.3 respectively. d. Leave switches K1 and K2 at 2 and cut off the external line of the call loop. Change the frequency of the audio oscillator output signal according to the test frequency, keep the output signal at 0dB, turn the switch K3, and measure the unbalanced attenuation value of point A grounded and ungrounded at each test frequency. Fill in the test results in Table 8. Table 8
K12 set to 1 terminal
K1K22 terminal
Unbalance
Unbalance
6.4.8 Test ringing current
6.4.8.1 Test equipment
Ungrounded
Ungrounded
16002000
AC ammeter: Measurement range: 1~200V, error not more than 2%, input impedance not less than 100k0, should be able to measure the effective value of the signal voltage of 15~60Hz
Digital frequency meter: Measurement frequency range: 10~100Hz, error not more than ±0.1Hz. Measuring time instrument: can measure the duration of pulses, the interval between step pulses, etc. The measuring time range is 10ms to 10s, and the measuring error is not more than 1ms.
6.4.8.2 Test method
The test circuit is shown in Figure 6.5Simulate the operation of selective calling, general calling and broadcasting, and observe their working conditions. 6.3.3.6Manually start the linkage control button of the sample, observe and record the control conditions of each channel. 6.3.3.7 Cut off the main power supply first, then restore it to normal, observe and record the conversion of the main power supply and backup power supply of the sample and the changes of the power indicator light.
6.3.3.8 Switch the main power supply to the backup power supply, and repeat the test process of 6.3.3.2~~6.3.3.6. 6.4 Technical index test
6.4.1 Purpose
To check the correctness of the technical indicators of the fire alarm dispatch console. 6.4.2 Requirements
The test results of the technical indicators of the sample should meet the requirements of 5.3.1~5.3.8. 6.4.3 Test the loop resistance of the wide-gate line for squadrons and dedicated lines. 6.4.3.1 Test equipment
DC milliammeter: test range 1～100mA, accuracy 0.5 level. 6.4.3.2 Test method
The test circuit is shown in Figure 1.
Xin'an meter
In the figure: R is the maximum resistance of the loop.
User circuit
b. Put the user under test in the call state, close K, and make R=1kα, and the recorded DC milliammeter reading should be no less than 18mA. 6.4.4 Test the insulation resistance and capacitance between the squadron user and the dedicated line user line. 6.4.4.1 Test equipment
Audio oscillator: balanced output, impedance is 0Q and 600Q. Frequency range: 300～3400Hz; output level range: 40~+20 dB.
Frequency-selective level meter: balanced input impedance not less than 30kΩ, frequency-selective range: 20Hz～10kHz; frequency selectivity not greater than 8Hz, measurement level range: -80～+20dB.
Transmission coil: turns ratio 1:1, DC resistance not greater than 75α. 6.4.4.2 Test method
The physical test circuit is shown in Figure 2.
Transfer wire cabinet
GB16281-1996
In the figure: R1=R2=R3m R4R rated maximum loop resistance - 300 0+9%R5 20-*ako
C-0. 5*B, ns μF
C1-C2- 4+ 0. 4 μF
Guang Ningdian
hPut K in open and close positions t:K1, change the frequency of the audio oscillator output signal according to the test frequency, keep the output signal at 0dB, use the level meter to measure the output signal level of each frequency point, and record it in Table 7. Put K in close position and repeat the test b.
6.4.5 Test transmission loss
6.4.5.1 Test equipment
F, Hz
Output 1
Output 2
Audio oscillator, frequency selection level meter, transfer coil: Same as 6.4.4.1. 1200
Balanced variable attenuator: Frequency range: 300-3400Hz; Attenuation value 0~100dB; Error ±0.02dB, Characteristic impedance 60006.4.5.2 Test method
The test line is shown in Figure 3.
Connect any loop to the dispatcher's telephone circuit, adjust the audio oscillator to output a signal with a frequency of 800Hz and a level of 0dBno.
Set switches K1 and K2 to the measured call loop -, and take the frequency selection level meter reading U1 (when the frequency selection is 800H2); then, set switches K1K2 to one side of the balanced attenuator, and adjust the attenuator to make the frequency selection level meter reading U2 - U1. The attenuator reading at this time is the transmission attenuation of the measured call loop. 446
Transfer coil
In the figure: R1-R2=R3=R4300±10
R5=R6=600±50
C1=C2=4±0. 4 μF
6.4.6 Test crosstalk attenuation
6.4.6.1 Test equipment
GB 16281--1996
Audio oscillator, balanced variable attenuator, transfer coil: Same as 6.4.4.1. a
Frequency-selective level meter: Balanced input, impedance not less than 30kQ, balance not less than 66dB, frequency range: 15Hz～200kHz, frequency selectivity not more than 8Hz, sensitivity -120dB, internal self-distortion attenuation should be no more than 80dB. 6.4.6.2 Test method
8. The test circuit is shown in Figure 4.
Transfer coil
In the figure: R1=R2R3=R4=300±10
R5=R6R7=R8-600±50
C1=C2=4±0.4μF
GB16281-1996
Talk circuit
bSelect two adjacent loops at random and connect them with the operator circuit to form a talk loop, as the main series talk loop and the series talk loop, and connect 600Q resistors to the terminals of the main and series loops respectively. Place switch K on the balanced attenuator side, adjust the balanced attenuator to 0 dB, adjust the audio oscillator output (frequency is c.
1100Hz, output impedance is 0Q), so that the frequency selection table reading is 11.4dBmo. d. Place switch K on the side of the loop being tested, read the value of the frequency-selective level meter as U1, and then place K on the side of the balanced variable attenuator. At this time, adjust the attenuator so that the value of the frequency-selective level meter U2=U1, and the value of the variable attenuator is the crosstalk attenuation between the two adjacent call loops being tested.
6.4.7, Test the unbalanced degree to ground
6.4.7.1 Test equipment
Audio oscillator, frequency-selective level meter, same as 6.4.4.1. 6.4.7.2 Test method
The test circuit is shown in Figure 5.
Audio oscillator
Figure: R1R2-R3=R30010
C1C2-100±10 μF
C3C4 4 +0. 1 μF
GB 16281-1996
Any squadron user (or dedicated line user) and the operator circuit form a call loop. h.
Set switches K1 and K2 to 1, change the frequency of the audio oscillator output signal according to the test frequency, keep the output signal at 0dB, turn K3 and use the frequency-selective level meter to measure the unbalanced attenuation value of the resistance bridge of the test system in the 300～3400Hz band when it is grounded or not grounded at point A. Both should be no less than 66dB. Fill in the test results in Table 6.3 respectively. d. Leave switches K1 and K2 at 2 and cut off the external line of the call loop. Change the frequency of the audio oscillator output signal according to the test frequency, keep the output signal at 0dB, turn the switch K3, and measure the unbalanced attenuation value of point A grounded and ungrounded at each test frequency. Fill in the test results in Table 8. Table 8
K12 set to 1 terminal
K1K22 terminal
Unbalance
Unbalance
6.4.8 Test ringing current
6.4.8.1 Test equipment
Ungrounded
Ungrounded
16002000
AC ammeter: Measurement range: 1~200V, error not more than 2%, input impedance not less than 100k0, should be able to measure the effective value of the signal voltage of 15~60Hz
Digital frequency meter: Measurement frequency range: 10~100Hz, error not more than ±0.1Hz. Measuring time instrument: can measure the duration of pulses, the interval between step pulses, etc. The measuring time range is 10ms to 10s, and the measuring error is not more than 1ms.
6.4.8.2 Test method
The test circuit is shown in Figure 6.2 Test method
The test circuit is shown in Figure 1.
Xin'an meter
In the figure: R is the maximum resistance of the loop.
User circuit
b. Put the user under test in a call state, close K, and make R=1kα, and record the DC milliammeter reading, which should be no less than 18mA. 6.4.4 Test the insulation resistance and capacitance between the squadron user and the dedicated line user line. 6.4.4.1 Test equipment
Audio oscillator: balanced output, impedance is 0Q and 600Q. Frequency range: 300~3400Hz; output level range: 40~+20dB.
Frequency-selective level meter: balanced input impedance is not less than 30kQ, frequency selection range: 20Hz~10kHz; frequency selectivity is not more than 8Hz, and measurement level range: -80~+20dB.
Transfer coil: turns ratio 1:1, DC resistance not more than 75α. 6.4.4.2 Test method
The physical test circuit is shown in Figure 2.
Transfer wire cabinet
GB16281-1996
In the figure: R1=R2=R3m R4R rated maximum loop resistance - 300 0+9%R5 20-*ako
C-0. 5*B, ns μF
C1-C2- 4+ 0. 4 μF
Guang Ningdian
hPut K in open and close positions: K1, change the frequency of the audio oscillator output signal according to the test frequency, keep the output signal at 0dB, use the select lock level meter to measure the output signal level of each frequency point, and record it in Table 7. Put K in close position and repeat the test b.
6.4.5 Test transmission loss
6.4.5.1 Test equipment
F, Hz
Output 1
Output 2
Audio oscillator, frequency selection level meter, transfer coil: Same as 6.4.4.1. 1200
Balanced variable attenuator: Frequency range: 300-3400Hz; Attenuation value 0~100dB; Error ±0.02dB, Characteristic impedance 60006.4.5.2 Test method
The test line is shown in Figure 3.
Connect any loop to the dispatcher's telephone circuit, adjust the audio oscillator to output a signal with a frequency of 800Hz and a level of 0dBno.
Set switches K1 and K2 to the measured call loop -, and take the frequency selection level meter reading U1 (when the frequency selection is 800H2); then, set switches K1K2 to one side of the balanced attenuator, and adjust the attenuator to make the frequency selection level meter reading U2 - U1. The attenuator reading at this time is the transmission attenuation of the measured call loop. 446
Transfer coil
In the figure: R1-R2=R3=R4300±10
R5=R6=600±50
C1=C2=4±0. 4 μF
6.4.6 Test crosstalk attenuation
6.4.6.1 Test equipment
GB 16281--1996
Audio oscillator, balanced variable attenuator, transfer coil: Same as 6.4.4.1. a
Frequency-selective level meter: Balanced input, impedance not less than 30kQ, balance not less than 66dB, frequency range: 15Hz～200kHz, frequency selectivity not more than 8Hz, sensitivity -120dB, internal self-distortion attenuation should be no more than 80dB. 6.4.6.2 Test method
8. The test circuit is shown in Figure 4.
Transfer coil
In the figure: R1=R2R3=R4=300±10
R5=R6R7=R8-600±50
C1=C2=4±0.4μF
GB16281-1996
Talk circuit
bSelect two adjacent loops at random and connect them with the operator circuit to form a talk loop, as the main series talk loop and the series talk loop, and connect 600Q resistors to the terminals of the main and series loops respectively. Place switch K on the balanced attenuator side, adjust the balanced attenuator to 0 dB, adjust the audio oscillator output (frequency is c.
1100Hz, output impedance is 0Q), so that the frequency selection table reading is 11.4dBmo. d. Place switch K on the side of the loop being tested, read the value of the frequency-selective level meter as U1, and then place K on the side of the balanced variable attenuator. At this time, adjust the attenuator so that the value of the frequency-selective level meter U2=U1, and the value of the variable attenuator is the crosstalk attenuation between the two adjacent call loops being tested.
6.4.7, Test the unbalanced degree to ground
6.4.7.1 Test equipment
Audio oscillator, frequency-selective level meter, same as 6.4.4.1. 6.4.7.2 Test method
The test circuit is shown in Figure 5.
Audio oscillator
Figure: R1R2-R3=R30010
C1C2-100±10 μF
C3C4 4 +0. 1 μF
GB 16281-1996
Any squadron user (or dedicated line user) and the operator circuit form a call loop. h.
Set switches K1 and K2 to 1, change the frequency of the audio oscillator output signal according to the test frequency, keep the output signal at 0dB, turn K3 and use the frequency-selective level meter to measure the unbalanced attenuation value of the resistance bridge of the test system in the 300～3400Hz band when it is grounded or not grounded at point A. Both should be no less than 66dB. Fill in the test results in Table 6.3 respectively. d. Leave switches K1 and K2 at 2 and cut off the external line of the call loop. Change the frequency of the audio oscillator output signal according to the test frequency, keep the output signal at 0dB, turn the switch K3, and measure the unbalanced attenuation value of point A grounded and ungrounded at each test frequency. Fill in the test results in Table 8. Table 8
K12 set to 1 terminal
K1K22 terminal
Unbalance
Unbalance
6.4.8 Test ringing current
6.4.8.1 Test equipment
Ungrounded
Ungrounded
16002000
AC ammeter: Measurement range: 1~200V, error not more than 2%, input impedance not less than 100k0, should be able to measure the effective value of the signal voltage of 15~60Hz
Digital frequency meter: Measurement frequency range: 10~100Hz, error not more than ±0.1Hz. Measuring time instrument: can measure the duration of pulses, the interval between step pulses, etc. The measuring time range is 10ms to 10s, and the measuring error is not more than 1ms.
6.4.8.2 Test method
The test circuit is shown in Figure 6.2 Test method
The test circuit is shown in Figure 1.
Xin'an meter
In the figure: R is the maximum resistance of the loop.
User circuit
b. Put the user under test in a call state, close K, and make R=1kα, and record the DC milliammeter reading, which should be no less than 18mA. 6.4.4 Test the insulation resistance and capacitance between the squadron user and the dedicated line user line. 6.4.4.1 Test equipment
Audio oscillator: balanced output, impedance is 0Q and 600Q. Frequency range: 300~3400Hz; output level range: 40~+20dB.
Frequency-selective level meter: balanced input impedance is not less than 30kQ, frequency selection range: 20Hz~10kHz; frequency selectivity is not more than 8Hz, and measurement level range: -80~+20dB.
Transfer coil: turns ratio 1:1, DC resistance not more than 75α. 6.4.4.2 Test method
The physical test circuit is shown in Figure 2.
Transfer wire cabinet
GB16281-1996
In the figure: R1=R2=R3m R4R rated maximum loop resistance - 300 0+9%R5 20-*ako
C-0. 5*B, ns μF
C1-C2- 4+ 0. 4 μF
Guang Ningdian
hPut K in open and close positions: K1, change the frequency of the audio oscillator output signal according to the test frequency, keep the output signal at 0dB, use the select lock level meter to measure the output signal level of each frequency point, and record it in Table 7. Put K in close position and repeat the test b.
6.4.5 Test transmission loss
6.4.5.1 Test equipment
F, Hz
Output 1
Output 2
Audio oscillator, frequency selection level meter, transfer coil: Same as 6.4.4.1. 1200
Balanced variable attenuator: Frequency range: 300-3400Hz; Attenuation value 0~100dB; Error ±0.02dB, Characteristic impedance 60006.4.5.2 Test method
The test line is shown in Figure 3.
Connect any loop to the dispatcher's telephone circuit, adjust the audio oscillator to output a signal with a frequency of 800Hz and a level of 0dBno.
Set switches K1 and K2 to the measured call loop -, and take the frequency selection level meter reading U1 (when the frequency selection is 800H2); then, set switches K1K2 to one side of the balanced attenuator, and adjust the attenuator to make the frequency selection level meter reading U2 - U1. The attenuator reading at this time is the transmission attenuation of the measured call loop. 446
Transfer coil
In the figure: R1-R2=R3=R4300±10
R5=R6=600±50
C1=C2=4±0. 4 μF
6.4.6 Test crosstalk attenuation
6.4.6.1 Test equipment
GB 16281--1996
Audio oscillator, balanced variable attenuator, transfer coil: Same as 6.4.4.1. a
Frequency-selective level meter: Balanced input, impedance not less than 30kQ, balance not less than 66dB, frequency range: 15Hz～200kHz, frequency selectivity not more than 8Hz, sensitivity -120dB, internal self-distortion attenuation should be no more than 80dB. 6.4.6.2 Test method
8. The test circuit is shown in Figure 4.
Transfer coil
In the figure: R1=R2R3=R4=300±10
R5=R6R7=R8-600±50
C1=C2=4±0.4μF
GB16281-1996
Talk circuit
bSelect two adjacent loops at random and connect them with the operator circuit to form a talk loop, as the main series talk loop and the series talk loop, and connect 600Q resistors to the terminals of the main and series loops respectively. Place switch K on the balanced attenuator side, adjust the balanced attenuator to 0 dB, adjust the audio oscillator output (frequency is c.
1100Hz, output impedance is 0Q), so that the frequency selection table reading is 11.4dBmo. d. Place switch K on the side of the loop being tested, read the value of the frequency-selective level meter as U1, and then place K on the side of the balanced variable attenuator. At this time, adjust the attenuator so that the value of the frequency-selective level meter U2=U1, and the value of the variable attenuator is the crosstalk attenuation between the two adjacent call loops being tested.
6.4.7, Test the unbalanced degree to ground
6.4.7.1 Test equipment
Audio oscillator, frequency-selective level meter, same as 6.4.4.1. 6.4.7.2 Test method
The test circuit is shown in Figure 5.
Audio oscillator
Figure: R1R2-R3=R30010
C1C2-100±10 μF
C3C4 4 +0. 1 μF
GB 16281-1996
Any squadron user (or dedicated line user) and the operator circuit form a call loop. h.
Set switches K1 and K2 to 1, change the frequency of the audio oscillator output signal according to the test frequency, keep the output signal at 0dB, turn K3 and use the frequency-selective level meter to measure the unbalanced attenuation value of the resistance bridge of the test system in the 300～3400Hz band when it is grounded or not grounded at point A. Both should be no less than 66dB. Fill in the test results in Table 6.3 respectively. d. Leave switches K1 and K2 at 2 and cut off the external line of the call loop. Change the frequency of the audio oscillator output signal according to the test frequency, keep the output signal at 0dB, turn the switch K3, and measure the unbalanced attenuation value of point A grounded and ungrounded at each test frequency. Fill in the test results in Table 8. Table 8
K12 set to 1 terminal
K1K22 terminal
Unbalance
Unbalance
6.4.8 Test ringing current
6.4.8.1 Test equipment
Ungrounded
Ungrounded
16002000
AC ammeter: Measurement range: 1~200V, error not more than 2%, input impedance not less than 100k0, should be able to measure the effective value of the signal voltage of 15~60Hz
Digital frequency meter: Measurement frequency range: 10~100Hz, error not more than ±0.1Hz. Measuring time instrument: can measure the duration of pulses, the interval between step pulses, etc. The measuring time range is 10ms to 10s, and the measuring error is not more than 1ms.
6.4.8.2 Test method
The test circuit is shown in Figure 6.2 Test method
The test line is shown in Figure 3.
Connect any loop to the dispatcher's telephone circuit, adjust the audio oscillator to output a signal with a frequency of 800Hz and a level of 0dBno.
Set switches K1 and K2 to the tested call loop -, and take the frequency selection level meter reading U1 (when the frequency selection is 800Hz); then, set switches K1K2 to one side of the balanced attenuator, and adjust the attenuator to make the frequency selection level meter reading U2-U1. The attenuator reading is the transmission loss of the tested call loop. 446
Transfer coil
In the figure: R1-R2=R3=R4300±10
R5=R6=600±50
C1=C2=4±0. 4 μF
6.4.6 Test crosstalk attenuation
6.4.6.1 Test equipment
GB 16281--1996
Audio oscillator, balanced variable attenuator, transfer coil: Same as 6.4.4.1. a
Frequency-selective level meter: Balanced input, impedance not less than 30kQ, balance not less than 66dB, frequency range: 15Hz～200kHz, frequency selectivity not more than 8Hz, sensitivity -120dB, internal self-distortion attenuation should be no more than 80dB. 6.4.6.2 Test method
8. The test circuit is shown in Figure 4.
Transfer coil
In the figure: R1=R2R3=R4=300±10
R5=R6R7=R8-600±50
C1=C2=4±0.4μF
GB16281-1996
Talk circuit
bSelect two adjacent loops at random and connect them with the operator circuit to form a talk loop, as the main series talk loop and the series talk loop, and connect 600Q resistors to the terminals of the main and series loops respectively. Place switch K on the balanced attenuator side, adjust the balanced attenuator to 0 dB, adjust the audio oscillator output (frequency is c.
1100Hz, output impedance is 0Q), so that the frequency selection table reading is 11.4dBmo. d. Place switch K on the side of the loop being tested, read the value of the frequency-selective level meter as U1, and then place K on the side of the balanced variable attenuator. At this time, adjust the attenuator so that the value of the frequency-selective level meter U2=U1, and the value of the variable attenuator is the crosstalk attenuation between the two adjacent call loops being tested.
6.4.7, Test the unbalanced degree to ground
6.4.7.1 Test equipment
Audio oscillator, frequency-selective level meter, same as 6.4.4.1. 6.4.7.2 Test method
The test circuit is shown in Figure 5.
Audio oscillator
Figure: R1R2-R3=R30010
C1C2-100±10 μF
C3C4 4 +0. 1 μF
GB 16281-1996
Any squadron user (or dedicated line user) and the operator circuit form a call loop. h.
Set switches K1 and K2 to 1, change the frequency of the audio oscillator output signal according to the test frequency, keep the output signal at 0dB, turn K3 and use the frequency-selective level meter to measure the unbalanced attenuation value of the resistance bridge of the test system in the 300～3400Hz band when it is grounded or not grounded at point A. Both should be no less than 66dB. Fill in the test results in Table 6.3 respectively. d. Leave switches K1 and K2 at 2 and cut off the external line of the call loop. Change the frequency of the audio oscillator output signal according to the test frequency, keep the output signal at 0dB, turn the switch K3, and measure the unbalanced attenuation value of point A grounded and ungrounded at each test frequency. Fill in the test results in Table 8. Table 8
K12 set to 1 terminal
K1K22 terminal
Unbalance
Unbalance
6.4.8 Test ringing current
6.4.8.1 Test equipment
Ungrounded
Ungrounded
16002000
AC ammeter: Measurement range: 1~200V, error not more than 2%, input impedance not less than 100k0, should be able to measure the effective value of the signal voltage of 15~60Hz
Digital frequency meter: Measurement frequency range: 10~100Hz, error not more than ±0.1Hz. Measuring time instrument: can measure the duration of pulses, the interval between step pulses, etc. The measuring time range is 10ms to 10s, and the measuring error is not more than 1ms.
6.4.8.2 Test method
The test circuit is shown in Figure 6.2 Test method
The test line is shown in Figure 3.
Connect any loop to the dispatcher's telephone circuit, adjust the audio oscillator to output a signal with a frequency of 800Hz and a level of 0dBno.
Set switches K1 and K2 to the tested call loop -, and take the frequency selection level meter reading U1 (when the frequency selection is 800Hz); then, set switches K1K2 to one side of the balanced attenuator, and adjust the attenuator to make the frequency selection level meter reading U2-U1. The attenuator reading is the transmission loss of the tested call loop. 446
Transfer coil
In the figure: R1-R2=R3=R4300±10
R5=R6=600±50
C1=C2=4±0. 4 μF
6.4.6 Test crosstalk attenuation
6.4.6.1 Test equipment
GB 16281--1996
Audio oscillator, balanced variable attenuator, transfer coil: Same as 6.4.4.1. a
Frequency-selective level meter: Balanced input, impedance not less than 30kQ, balance not less than 66dB, frequency range: 15Hz～200kHz, frequency selectivity not more than 8Hz, sensitivity -120dB, internal self-distortion attenuation should be no more than 80dB. 6.4.6.2 Test method
8. The test circuit is shown in Figure 4.
Transfer coil
In the figure: R1=R2R3=R4=300±10
R5=R6R7=R8-600±50
C1=C2=4±0.4μF
GB16281-1996
Talk circuit
bSelect two adjacent loops at random and connect them with the operator circuit to form a talk loop, as the main series talk loop and the series talk loop, and connect 600Q resistors to the terminals of the main and series loops respectively. Place switch K on the balanced attenuator side, adjust the balanced attenuator to 0 dB, adjust the audio oscillator output (frequency is c.
1100Hz, output impedance is 0Q), so that the frequency selection table reading is 11.4dBmo. d. Place switch K on the side of the loop being tested, read the value of the frequency-selective level meter as U1, and then place K on the side of the balanced variable attenuator. At this time, adjust the attenuator so that the value of the frequency-selective level meter U2=U1, and the value of the variable attenuator is the crosstalk attenuation between the two adjacent call loops being tested.
6.4.7, Test the unbalanced degree to ground
6.4.7.1 Test equipment
Audio oscillator, frequency-selective level meter, same as 6.4.4.1. 6.4.7.2 Test method
The test circuit is shown in Figure 5.
Audio oscillator
Figure: R1R2-R3=R30010
C1C2-100±10 μF
C3C4 4 +0. 1 μF
GB 16281-1996
Any squadron user (or dedicated line user) and the operator circuit form a call loop. h.
Set switches K1 and K2 to 1, change the frequency of the audio oscillator output signal according to the test frequency, keep the output signal at 0dB, turn K3 and use the frequency-selective level meter to measure the unbalanced attenuation value of the resistance bridge of the test system in the 300～3400Hz band when it is grounded or not grounded at point A. Both should be no less than 66dB. Fill in the test results in Table 6.3 respectively. d. Leave switches K1 and K2 at 2 and cut off the external line of the call loop. Change the frequency of the audio oscillator output signal according to the test frequency, keep the output signal at 0dB, turn the switch K3, and measure the unbalanced attenuation value of point A grounded and ungrounded at each test frequency. Fill in the test results in Table 8. Table 8
K12 set to 1 terminal
K1K22 terminal
Unbalance
Unbalance
6.4.8 Test ringing current
6.4.8.1 Test equipment
Ungrounded
Ungrounded
16002000
AC ammeter: Measurement range: 1~200V, error not more than 2%, input impedance not less than 100k0, should be able to measure the effective value of the signal voltage of 15~60Hz
Digital frequency meter: Measurement frequency range: 10~100Hz, error not more than ±0.1Hz. Measuring time instrument: can measure the duration of pulses, the interval between step pulses, etc. The measuring time range is 10ms to 10s, and the measuring error is not more than 1ms.
6.4.8.2 Test method
The test circuit is shown in Figure 6.1Hz. Time measuring instrument: can measure the duration of pulses, the interval between step pulses, etc. The measuring time range is 10ms to 10s, and the measuring error is not more than 1ms.
6.4.8.2 Test method
The test circuit is shown in Figure 6.1Hz. Time measuring instrument: can measure the duration of pulses, the interval between step pulses, etc. The measuring time range is 10ms to 10s, and the measuring error is not more than 1ms.
6.4.8.2 Test method
The test circuit is shown in Figure 6.
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