Some standard content:
National Standard of the People's Republic of China
Measuring methods for frequency counters
Measuring methods for frequency counters1 Subject content and scope of application
GB/T15151.2-94
The test methods specified in this standard are applicable to the test of the main performance characteristics specified in GB/T15151.1 General technical conditions for frequency counters.
2 Reference standards
IEC679-1\Quartz crystal oscillator components Part 1: Comprehensive information, test conditions and test methods GB6592 General provisions for errors of electronic measuring instruments GBn249.1-249.2 An interface system for programmable measuring instruments (bit serial, bit parallel format) GB/T15151.1-94 General technical conditions for frequency counters 3 General provisions
3.1 The test methods specified in this standard, their terms, technical requirements, performance characteristics test items and determination of test points shall comply with the relevant provisions of GB/T15151.1.
3-2 The test instrument must be measured and comply with the relevant provisions of GB6592. 3.3 The frequency counter under test (hereinafter referred to as the tested frequency counter) and the instrument to be tested can be tested only after reaching the preheating time specified in each specification.
3.4 The pre-adjustment of the tested frequency counter should be completed before the test begins. 3.5 The tested frequency counter with input attenuator should be adjusted to the ×1 position for basic measurement. 3.6 If the tested frequency counter is equipped with a trigger slope switch, the test should be carried out under positive and negative polarity. For the tested frequency counter with a trigger voltage regulator, the empty sensitivity position should be adjusted for testing. 3.7
The matching resistor should be prepared according to the needs of the test system. 3.B
The test should be carried out at a signal-to-noise ratio not lower than that specified in the product standard. 3.9
3.10 The frequency accuracy and stability of the synthetic signal generator used for measurement shall be 10 times and 3 times better than the accuracy and stability of the measured frequency timing base, respectively. Its frequency range shall include the frequency measurement range of the measured frequency meter. The output waveform shall be a sine wave with a distortion better than 5%. 4 Performance Characteristics Test
4.1 Frequency Measurement Range
4.1.1 Test Block Diagram
See Figure 1.
Instructions for use:
1) IEC 679--1 has been adopted as the recommended standard of the Ministry of Machinery and Electronics SI/Z 9155.1. Approved by the State Bureau of Technical Supervision on July 6, 1994 and implemented on February 1, 1995
4.1-2 Test steps
Synthetic signal generator
CE/T 15151.2-94
High attenuator
Voltmeter
(or without oscillator)
The voltmeter (or indicator) should be placed at the input port of the frequency meter under test; set the input voltage to the input sensitivity specified in the product standard; set the gate time to the position specified in the product standard, R
This measurement sequence is calculated,
so that the synthetic signal generator gradually decreases from near the lowest frequency specified in the product standard. When the frequency meter under test changes from a state that meets the accuracy requirements to a state that does not meet the accuracy requirements, the frequency at this time is measured as the lowest frequency of the measurement range: e.
Make the synthetic signal generator gradually increase from the vicinity of the highest frequency specified in the product standard. When the frequency meter under test changes from a state that meets the accuracy requirements to a state that does not meet the accuracy requirements, the frequency at this time is measured as the highest frequency of the measurement range; fix the frequency of the synthetic signal generator at any intermediate frequency, and check that the accuracy of the frequency meter under test meets the requirements of the product standard. If there are two input channels or a frequency meter equipped with a frequency converter, each input channel or frequency converter should be measured in d and e; g
Fix the input voltage at the maximum input voltage specified in the product standard; perform the test from b to f, and the measured frequency range is represented by the interval from the lowest frequency to the highest frequency, f, to f. 4.2 Sensitivity
4.2.1 Test block diagram
See Figure 1,
4.2.2 Test steps
Same as 4.1.2: Test steps: Fix the frequency of the input signal at the lowest point of the frequency range specified in the product standard; h.
Make the synthetic signal generator (or attenuator) gradually increase the voltage amplitude of the input signal from below the sensitivity specified in the product standard. When the frequency meter under test changes from a frequency measurement state that does not meet the accuracy requirements to a frequency measurement state that meets the accuracy requirements, the input voltage is the low-end sensitivity;
d. Fix the frequency of the input signal at the highest point of the frequency range specified in the product standard, and perform the above test c to measure the high-end sensitivity:
e. Fix the frequency of the synthetic signal generator at any intermediate frequency, and check whether the measured frequency "sensitivity" meets the requirements of the product standard;
f. The measured sensitivity is calculated by the millivolt value with the largest sensitivity value in the frequency range. 4.3 Dynamic range
4.3.1. Test block diagram
See Figure 1.
4.3.2 Test steps
Make the frequency of the output signal of the synthetic signal generator the lowest frequency in the frequency range specified by the product standard, a
h. The gate time is selected according to the product standard: GB/T15151.2-94
Adjust Adjust the output voltage of the synthetic signal generator, and gradually increase it from near the sensitivity amplitude specified in the product standard. When the frequency meter under test changes from a frequency measurement state that does not meet the accuracy requirements to a frequency measurement state that meets the accuracy requirements, the input voltage amplitude is the lowest voltage of the dynamic range Vaai
Adjust the output voltage of the synthetic signal generator, and gradually reduce it from near the maximum input signal amplitude value specified in the product standard. When the frequency meter under test changes from a frequency measurement state that does not meet the accuracy requirements to a frequency measurement state that meets the accuracy requirements, the input voltage amplitude is the highest voltage of the dynamic range Vmaz;||t t||Make the frequency of the output signal of the synthetic signal generator the highest frequency in the frequency range specified by the product standard, and repeat steps c and d; e.
f. When the dynamic range is divided into sections, each frequency band must be tested according to the requirements of steps ab, c, d, and c above; g. The measured dynamic range is represented by the smaller value Vmin~V. between the lowest voltage and the highest voltage measured in the frequency range.
4.4 Input impedance
4.4.1 Test block diagram
See Figure 2.
Tested
4.4.2 Test steps
Anode
a. The frequency meter under test is in the off state. At the frequency point specified in the product standard or the low end of the frequency range, use the impedance test equipment to test the input resistance.
b. The frequency meter under test is in the on state. At the frequency point specified in the product standard or the high end of the frequency measurement range, use the direct reading capacitance tester or meter to test the parallel capacitance.
c. For the frequency meter with a frequency quotient of more than 300MΩ, the input impedance of 50Ω is directly measured by the network analyzer or other impedance test equipment.
4.4.3 Test requirements
a. For the frequency meter with a frequency quotient of less than 300MΩ, use the network analyzer or other impedance test equipment to directly measure the input impedance value. For frequency meters with a frequency of MHz or higher, the input impedance is expressed as the lowest resistance and the maximum capacitance measured. b. For frequency meters with a frequency of 300MHz or higher, the impedance is expressed as the calculated impedance or characteristic impedance. 4.5 Waveform adaptability
4.5.1 Test block diagram
See Figure 1.
4.5.2 Test steps
The input voltage of the frequency meter under test is adjusted to a sine signal with an amplitude of 30% (the valley value of its envelope should meet the sensitivity requirements), and the test steps are the same as 4.1.2.
4.6 Accuracy
4.6.1 Test block diagram
See Figure! 。
4.6.2 Test steps
The output voltage of the synthetic signal generator (or after attenuation) is adjusted to the sensitivity specified in the product standard, and the gate time of the frequency meter under test is set to the gate time specified in the product standard: h.bzxZ.net
The frequency accuracy is calculated from the indication value of the frequency meter under test and the frequency indication value of the synthetic signal generator. The calculation formula is as follows: Where: A—Frequency accuracy:
f.-Indication value of the measured frequency, Hz;
GB/T 15151.2—94
f. ---Frequency of the synthetic signal generator, Hz. 4.7 Resolution
4.7.1 Test block diagram
See Figure 1.
4.7.2 Test steps
The frequency and amplitude of the output signal of the synthetic signal generator are adjusted within the frequency measurement range and dynamic range of the measured frequency meter respectively. The gate time of the measured frequency meter is changed according to the requirements of the product standard. The measured frequency meter should be able to measure the frequency stably, and the number of displayed digits should meet the requirements of the product standard. 4.8 Gate time
4.8-1 Test block diagram
See Figure 3.
Test steps
Output the frequency signal from the synthetic signal generator to the measured frequency meter; the measured frequency meter is in the frequency measurement state:
Excite the source
The gate time is the ratio of the value displayed by the measured frequency meter to the input frequency in seconds. That is: Gate time (s) =
4. 8.3 Test requirements
When there are multiple gate times, test each level one by one. 4.9 Gate indication
Displayed value
Input rate
Whether the gate indicator can indicate that the main gate is open and measurement is in progress. 4. 10 Display
Whether the display can be clearly read by a user with a visual acuity of 1.0 or above at a distance of 1 and a viewing angle of 45. Whether there is a measurement unit indication and automatic decimal point positioning.
4.11 Self-test
Test steps
a Select "gate time" and "time scale" respectively. The reading of the measured frequency meter should comply with the provisions of the product standard; the self-test method of other performance characteristics shall be specified by the product standard. 4.12 Time base
The time base signal aging rate, frequency temperature change, rated voltage change and other indicators of the measured frequency meter shall be tested in accordance with the requirements of 9.3.1, 8.2.5 and 8.2.7 of IEC679-1. 4.13 Time base output
4.13.1 Test block diagram
See Figure 4.
4.13.2 Test steps
Recovery frequency
15151.2 -- 94
Time base output
Voltmeter
Water-cooled device
Frequency measurement
Measurement device
The time base output signal of the measured frequency meter is input to the input terminal of the frequency measurement device, and its reading shall comply with the provisions of the product standard: the output voltage and waveform measured by the voltmeter and oscilloscope shall comply with the provisions of the product standard. h
Test requirements
The frequency measurement device shall have an accuracy 10 times higher than that of the measured frequency meter; the connection with the voltmeter and oscilloscope shall consider impedance matching. 4.14 External standard frequency output
Use the external standard frequency input that meets the requirements of the product standard to check the frequency meter under test according to the requirements of 4.1, 1.2 and 41.3. Its frequency measurement function shall comply with the provisions of the product standard. ||tt| |4.15 Input channel
Observe that each channel of the measured frequency meter can measure the frequency normally. 4.16 Input attenuation
Use a large signal within the dynamic range to input the measured frequency meter, check that the input attenuation meets the requirements of one, three, five steps or continuous reduction, and that the frequency can be measured normally.
4.17 Voltage standing wave ratio (VSWR)
4.17.1 Direct measurement method
Use a network analyzer or a wave ratio bridge: the value of the voltage standing wave ratio can be directly measured. 4.17.2 Voltage measurement method
4.17-2.1 Test block diagram
See Figure 5.
4.17.2.2 Test steps
Disease card makeup generator
(with internal organ system
GB/T 15151-2
According to the measurement
Measurement amplifier
Standard quality
a. According to Figure 5, equip the instrument and microwave device consistent with the frequency band to be measured: h send microwave signal to the measurement line, connect the 500 standard load (accessory of the measurement line) to the output end of the measurement line, adjust the variable attenuator to make the measurement amplifier have voltage indication, and fine-tune the external tuning cavity in the measurement line to make it resonate at the signal frequency. At this time, if the measurement amplifier is off, the signal output amplitude can be reduced or the attenuation can be increased or the amplifier can be reduced. Amplification: Move the probe position of the measuring line to find the maximum V and |Vmiml, and make the reading within the range of the measuring amplifier. At this time, the VSWR of the test system is the smallest; c
Remove the 50n standard load. Press the frequency to be measured, move the probe position of the measuring line. Find the value of |Vl and iVmal of the adjacent group: connect formula (3) to calculate the VSWR, that is: /iVm
WiVial
Change the frequency of the signal generator, repeat steps b and c, and get another set of data. Calculate the VSWR at this frequency. d
4.17.2.3 Test requirements
The measurement should be carried out under small signal conditions to avoid the increase of VSWR measurement error bh. The selected instruments and devices must be consistent with the frequency meter section to be measured; (3
requires that the standing wave ratio of the test system itself can be ignored, the standing wave ratio of each instrument and device itself should be small, and the connection between each instrument (device) is required to be tightly matched to minimize the system standing wave ratio. If the voltage standing wave is required to be measured more accurately, multiple sets of |Vi| and |Vri| values can be obtained, and then the average values of |V.μ| and [V| can be calculated. Then the mean values of IV..i and |V.| are calculated according to formula (3) to obtain a more accurate voltage standing wave ratio value. 4.18 Damage level
Take the DCA specified in the product standard as the reference C-value frequency signal, input to the measured frequency meter one minute later, the input voltage amplitude is reduced to the dynamic range, its frequency measurement function should meet the requirements of 4.1. 4.19 Manual trigger level range
Use a bidirectional voltmeter to measure the range of the dynamic trigger level change when the dynamic trigger knob is rotated at the trigger level test point, which should meet the requirements of the product standard.
4.20 Amplitude tolerance (AM)
A frequency signal with a modulation amplitude of \×10% (the signal envelope valley value should meet the sensitivity requirements) specified in the product standard is input to the measured frequency meter, according to 4.1 4.21 Display
GB/T15151.2-94
In the test of 4.1, observe whether the blanking and storage functions are normal. 4.22 Overflow
In the test of 4.1, observe whether the overflow function is positive. 4.23 Connection function
4.23.1 Test block diagram
See Figure 6.
Winning line separation
4.23.2 Test steps
Tested frequency meter
The tested frequency meter is connected to the bus analyzer according to Figure 6, and its interface function is tested according to the requirements of GBm249.1~249.2. 4.24 BCI) code input
4.24.1 Test block diagram
See Figure 7.
Signal generator
4.24.2 Test steps
The frequency meter
BCD input
Input the signal of the signal generator to the input terminal of the frequency meter under test: set the function switch to the "counting" position;
Oscilloscope
(or direct current meter)
Adjust the frequency of the signal generator from low to high, so that the counting circuits of each level of the frequency meter under test appear in the required state, and use an oscilloscope or a DC ammeter to measure the level of the "1" and (" states of the code input logic and the level of the print command signal point by point, which should comply with the provisions of the product standard.
4.25 Maximum power consumption
4.25.1 Test block diagram
AC ammeter
Telephone
4.25-2 Test steps
|Install the AC voltmeter and AC ammeter according to Figure 8: h.
Tested frequency meter
Electrical thin socket
Make the tested frequency meter in the maximum power consumption working state and measure the current and voltage values under the condition of rated power supply voltage, and calculate the maximum power consumption (W value).
Where: P.-power, W
V---AC voltage, V.
.-AC current, A.
Additional instructions:
GB/T15151.2—94
P=V·I
This standard is proposed by the Ministry of Electronics Industry of the People's Republic of China. This standard is under the jurisdiction of the Standardization Research Institute of the Ministry of Electronics Industry. This standard was drafted by Nanjing Telecommunications Instrument Factory and the Standardization Research Institute of the Ministry of Electronics Industry. The main drafters of this standard are Bao Chenghao, Wang Jiahua, Chen Zhen, and Qin Hua. 43 Test requirements
Test each time when there are multiple gate times. 4.9 Gate indication
Displayed value
Input lazy rate
Daily test gate indicator to indicate whether the main gate is open and measurement is in progress. 4. 10 Display
Daily test display to see clearly when the visual angle is 45 degrees at a distance of 1 degree. Whether there is indication of measurement unit and automatic positioning of decimal point.
4.11 Self-test
Test steps
a Select "gate time" and "time scale" respectively. The reading of the measured frequency meter should comply with the provisions of the product standard; the self-test method of other performance characteristics shall be specified by the product standard. 4.12 Time base
The time base signal aging rate, frequency temperature change, rated voltage change and other indicators of the measured frequency meter shall be tested in accordance with the requirements of 9.3.1, 8.2.5 and 8.2.7 of IEC679-1. 4.13 Time base output
4.13.1 Test block diagram
See Figure 4.
4.13.2 Test steps
Recovery frequency
15151.2 -- 94
Time base output
Voltmeter
Water-cooled device
Frequency measurement
Measurement device
The time base output signal of the measured frequency meter is input to the input terminal of the frequency measurement device, and its reading shall comply with the provisions of the product standard: the output voltage and waveform measured by the voltmeter and oscilloscope shall comply with the provisions of the product standard. h
Test requirements
The frequency measurement device shall have an accuracy 10 times higher than that of the measured frequency meter; the connection with the voltmeter and oscilloscope shall consider impedance matching. 4.14 External standard frequency output
Use the external standard frequency input that meets the requirements of the product standard to check the frequency meter under test according to the requirements of 4.1, 1.2 and 41.3. Its frequency measurement function shall comply with the provisions of the product standard. ||tt| |4.15 Input channel
Observe that each channel of the measured frequency meter can measure the frequency normally. 4.16 Input attenuation
Use a large signal within the dynamic range to input the measured frequency meter, check that the input attenuation meets the requirements of one, three, five steps or continuous reduction, and that the frequency can be measured normally.
4.17 Voltage standing wave ratio (VSWR)
4.17.1 Direct measurement method
Use a network analyzer or a wave ratio bridge: the value of the voltage standing wave ratio can be directly measured. 4.17.2 Voltage measurement method
4.17-2.1 Test block diagram
See Figure 5.
4.17.2.2 Test steps
Disease card makeup generator
(with internal organ system
GB/T 15151-2
According to the measurement
Measurement amplifier
Standard quality
a. According to Figure 5, equip the instrument and microwave device consistent with the frequency band to be measured: h send microwave signal to the measurement line, connect the 500 standard load (accessory of the measurement line) to the output end of the measurement line, adjust the variable attenuator to make the measurement amplifier have voltage indication, and fine-tune the external tuning cavity in the measurement line to make it resonate at the signal frequency. At this time, if the measurement amplifier is off, the signal output amplitude can be reduced or the attenuation can be increased or the amplifier can be reduced. Amplification: Move the probe position of the measuring line to find the maximum V and |Vmiml, and make the reading within the range of the measuring amplifier. At this time, the VSWR of the test system is the smallest; c
Remove the 50n standard load. Press the frequency to be measured, move the probe position of the measuring line. Find the value of |Vl and iVmal of the adjacent group: connect formula (3) to calculate the VSWR, that is: /iVm
WiVial
Change the frequency of the signal generator, repeat steps b and c, and get another set of data. Calculate the VSWR at this frequency. d
4.17.2.3 Test requirements
The measurement should be carried out under small signal conditions to avoid the increase of VSWR measurement error bh. The selected instruments and devices must be consistent with the frequency meter section to be measured; (3
requires that the standing wave ratio of the test system itself can be ignored, the standing wave ratio of each instrument and device itself should be small, and the connection between each instrument (device) is required to be tightly matched to minimize the system standing wave ratio. If the voltage standing wave is required to be measured more accurately, multiple sets of |Vi| and |Vri| values can be obtained, and then the average values of |V.μ| and [V| can be calculated. Then the mean values of IV..i and |V.| are calculated according to formula (3) to obtain a more accurate voltage standing wave ratio value. 4.18 Damage level
Take the DCA specified in the product standard as the reference C-value frequency signal, input to the measured frequency meter one minute later, the input voltage amplitude is reduced to the dynamic range, its frequency measurement function should meet the requirements of 4.1. 4.19 Manual trigger level range
Use a bidirectional voltmeter to measure the range of the dynamic trigger level change when the dynamic trigger knob is rotated at the trigger level test point, which should meet the requirements of the product standard.
4.20 Amplitude tolerance (AM)
A frequency signal with a modulation amplitude of \×10% (the signal envelope valley value should meet the sensitivity requirements) specified in the product standard is input to the measured frequency meter, according to 4.1 4.21 Display
GB/T15151.2-94
In the test of 4.1, observe whether the blanking and storage functions are normal. 4.22 Overflow
In the test of 4.1, observe whether the overflow function is positive. 4.23 Connection function
4.23.1 Test block diagram
See Figure 6.
Winning line separation
4.23.2 Test steps
Tested frequency meter
The tested frequency meter is connected to the bus analyzer according to Figure 6, and its interface function is tested according to the requirements of GBm249.1~249.2. 4.24 BCI) code input
4.24.1 Test block diagram
See Figure 7.
Signal generator
4.24.2 Test steps
The frequency meter
BCD input
Input the signal of the signal generator to the input terminal of the frequency meter under test: set the function switch to the "counting" position;
Oscilloscope
(or direct current meter)
Adjust the frequency of the signal generator from low to high, so that the counting circuits of each level of the frequency meter under test appear in the required state, and use an oscilloscope or a DC ammeter to measure the level of the "1" and (" states of the code input logic and the level of the print command signal point by point, which should comply with the provisions of the product standard.
4.25 Maximum power consumption
4.25.1 Test block diagram
AC ammeter
Telephone
4.25-2 Test steps
|Install the AC voltmeter and AC ammeter according to Figure 8: h.
Tested frequency meter
Electrical thin socket
Make the tested frequency meter in the maximum power consumption working state and measure the current and voltage values under the condition of rated power supply voltage, and calculate the maximum power consumption (W value).
Where: P.-power, W
V---AC voltage, V.
.-AC current, A.
Additional instructions:
GB/T15151.2—94
P=V·I
This standard is proposed by the Ministry of Electronics Industry of the People's Republic of China. This standard is under the jurisdiction of the Standardization Research Institute of the Ministry of Electronics Industry. This standard was drafted by Nanjing Telecommunications Instrument Factory and the Standardization Research Institute of the Ministry of Electronics Industry. The main drafters of this standard are Bao Chenghao, Wang Jiahua, Chen Zhen, and Qin Hua. 43 Test requirements
Test each time when there are multiple gate times. 4.9 Gate indication
Displayed value
Input lazy rate
Daily test gate indicator to indicate whether the main gate is open and measurement is in progress. 4. 10 Display
Daily test display to see clearly when the visual angle is 45 degrees at a distance of 1 degree. Whether there is indication of measurement unit and automatic positioning of decimal point.
4.11 Self-test
Test steps
a Select "gate time" and "time scale" respectively. The reading of the measured frequency meter should comply with the provisions of the product standard; the self-test method of other performance characteristics shall be specified by the product standard. 4.12 Time base
The time base signal aging rate, frequency temperature change, rated voltage change and other indicators of the measured frequency meter shall be tested in accordance with the requirements of 9.3.1, 8.2.5 and 8.2.7 of IEC679-1. 4.13 Time base output
4.13.1 Test block diagram
See Figure 4.
4.13.2 Test steps
Recovery frequency
15151.2 -- 94
Time base output
Voltmeter
Water-cooled device
Frequency measurement
Measurement device
The time base output signal of the measured frequency meter is input to the input terminal of the frequency measurement device, and its reading shall comply with the provisions of the product standard: the output voltage and waveform measured by the voltmeter and oscilloscope shall comply with the provisions of the product standard. h
Test requirements
The frequency measurement device shall have an accuracy 10 times higher than that of the measured frequency meter; the connection with the voltmeter and oscilloscope shall consider impedance matching. 4.14 External standard frequency output
Use the external standard frequency input that meets the requirements of the product standard to check the frequency meter under test according to the requirements of 4.1, 1.2 and 41.3. Its frequency measurement function shall comply with the provisions of the product standard. ||tt| |4.15 Input channel
Observe that each channel of the measured frequency meter can measure the frequency normally. 4.16 Input attenuation
Use a large signal within the dynamic range to input the measured frequency meter, check that the input attenuation meets the requirements of one, three, five steps or continuous reduction, and that the frequency can be measured normally.
4.17 Voltage standing wave ratio (VSWR)
4.17.1 Direct measurement method
Use a network analyzer or a wave ratio bridge: the value of the voltage standing wave ratio can be directly measured. 4.17.2 Voltage measurement method
4.17-2.1 Test block diagram
See Figure 5.
4.17.2.2 Test steps
Disease card makeup generator
(with internal organ system
GB/T 15151-2
According to the measurement
Measurement amplifier
Standard quality
a. According to Figure 5, equip the instrument and microwave device consistent with the frequency band to be measured: h send microwave signal to the measurement line, connect the 500 standard load (accessory of the measurement line) to the output end of the measurement line, adjust the variable attenuator to make the measurement amplifier have voltage indication, and fine-tune the external tuning cavity in the measurement line to make it resonate at the signal frequency. At this time, if the measurement amplifier is off, the signal output amplitude can be reduced or the attenuation can be increased or the amplifier can be reduced. Amplification: Move the probe position of the measuring line to find the maximum V and |Vmiml, and make the reading within the range of the measuring amplifier. At this time, the VSWR of the test system is the smallest; c
Remove the 50n standard load. Press the frequency to be measured, move the probe position of the measuring line. Find the value of |Vl and iVmal of the adjacent group: connect formula (3) to calculate the VSWR, that is: /iVm
WiVial
Change the frequency of the signal generator, repeat steps b and c, and get another set of data. Calculate the VSWR at this frequency. d
4.17.2.3 Test requirements
The measurement should be carried out under small signal conditions to avoid the increase of VSWR measurement error bh. The selected instruments and devices must be consistent with the frequency meter section to be measured; (3
requires that the standing wave ratio of the test system itself can be ignored, the standing wave ratio of each instrument and device itself should be small, and the connection between each instrument (device) is required to be tightly matched to minimize the system standing wave ratio. If the voltage standing wave is required to be measured more accurately, multiple sets of |Vi| and |Vri| values can be obtained, and then the average values of |V.μ| and [V| can be calculated. Then the mean values of IV..i and |V.| are calculated according to formula (3) to obtain a more accurate voltage standing wave ratio value. 4.18 Damage level
Take the DCA specified in the product standard as the reference C-value frequency signal, input to the measured frequency meter one minute later, the input voltage amplitude is reduced to the dynamic range, its frequency measurement function should meet the requirements of 4.1. 4.19 Manual trigger level range
Use a bidirectional voltmeter to measure the range of the dynamic trigger level change when the dynamic trigger knob is rotated at the trigger level test point, which should meet the requirements of the product standard.
4.20 Amplitude tolerance (AM)
A frequency signal with a modulation amplitude of \×10% (the signal envelope valley value should meet the sensitivity requirements) specified in the product standard is input to the measured frequency meter, according to 4.1 4.21 Display
GB/T15151.2-94
In the test of 4.1, observe whether the blanking and storage functions are normal. 4.22 Overflow
In the test of 4.1, observe whether the overflow function is positive. 4.23 Connection function
4.23.1 Test block diagram
See Figure 6.
Winning line separation
4.23.2 Test steps
Tested frequency meter
The tested frequency meter is connected to the bus analyzer according to Figure 6, and its interface function is tested according to the requirements of GBm249.1~249.2. 4.24 BCI) code input
4.24.1 Test block diagram
See Figure 7.
Signal generator
4.24.2 Test steps
The frequency meter
BCD input
Input the signal of the signal generator to the input terminal of the frequency meter under test: set the function switch to the "counting" position;
Oscilloscope
(or direct current meter)
Adjust the frequency of the signal generator from low to high, so that the counting circuits of each level of the frequency meter under test appear in the required state, and use an oscilloscope or a DC ammeter to measure the level of the "1" and (" states of the code input logic and the level of the print command signal point by point, which should comply with the provisions of the product standard.
4.25 Maximum power consumption
4.25.1 Test block diagram
AC ammeter
Telephone
4.25-2 Test steps
|Install the AC voltmeter and AC ammeter according to Figure 8: h.
Tested frequency meter
Electrical thin socket
Make the tested frequency meter in the maximum power consumption working state and measure the current and voltage values under the condition of rated power supply voltage, and calculate the maximum power consumption (W value).
Where: P.-power, W
V---AC voltage, V.
.-AC current, A.
Additional instructions:
GB/T15151.2—94
P=V·I
This standard is proposed by the Ministry of Electronics Industry of the People's Republic of China. This standard is under the jurisdiction of the Standardization Research Institute of the Ministry of Electronics Industry. This standard was drafted by Nanjing Telecommunications Instrument Factory and the Standardization Research Institute of the Ministry of Electronics Industry. The main drafters of this standard are Bao Chenghao, Wang Jiahua, Chen Zhen, and Qin Hua. 42 -- 94
Time base output
Voltmeter
Water-tight device
Frequency measurement
Measurement device
The time base output signal of the measured frequency meter is input to the input terminal of the frequency measurement device, and its reading shall comply with the provisions of the product standard: the output voltage and waveform measured by the voltmeter and oscilloscope shall comply with the provisions of the product standard. h
Test requirements
The frequency measurement device shall have an accuracy 10 times higher than that of the measured frequency meter; the connection with the voltmeter and oscilloscope shall consider impedance matching. 4.14 External standard frequency output
Use the external standard frequency input that meets the requirements of the product standard to check the frequency measurement function of the measured frequency meter according to the requirements of 4.1, 1.2 and 41.3. It shall comply with the provisions of the product standard.
4.15 Input channel
Observe that each channel of the measured frequency meter can measure the frequency normally. 4.16 Input attenuation
Use a large signal within the dynamic range to input the frequency meter to be tested, and check whether the input attenuation meets the requirements of one, three, five steps or continuous reduction, and whether the frequency can be measured normally.
4.17 Voltage Standing Wave Ratio (VSWR)
4.17.1 Direct measurement method
Use a network analyzer or a wave ratio bridge: the value of the voltage standing wave ratio can be directly measured. 4.17.2 Voltage measurement method
4.17-2.1 Test block diagram
See Figure 5.
4.17.2.2 Test steps
Disease card makeup generator
(with internal organ system
GB/T 15151-2
According to the measurement
Measurement amplifier
Standard quality
a. According to Figure 5, equip the instrument and microwave device consistent with the frequency band to be measured: h send microwave signal to the measurement line, connect 500 standard load (accessory of the measurement line) to the output end of the measurement line, adjust the variable attenuator to make the measurement amplifier have voltage indication, and fine-tune the external tuning cavity in the measurement line to make it resonate at the signal frequency. At this time, if the measurement amplifier is on, the signal output amplitude can be reduced or the attenuation can be increased or the amplifier amplification can be reduced: move the probe position of the measurement line to find the maximum V and |Vmiml , and make the reading within the range of the tester. At this time, the VSWR of the test system is the smallest; c
Remove the 50n standard load. Press the frequency meter to be tested, and move the probe position of the measuring line. Find the value of the adjacent group |Vl and iVmal: Connect formula (3) to calculate the VSWR, that is: /iVm
WiVial
Change the frequency of the signal generator, repeat steps b and c, and get another set of data. Calculate the VSWR at this frequency. d
4.17.2.3 Test requirements
The measurement should be carried out under small signal conditions to avoid the increase of VSWR measurement error bh. The selected instruments and devices must be consistent with the frequency meter section to be measured; (3
requires that the standing wave ratio of the test system itself can be ignored, the standing wave ratio of each instrument and device itself should be small, and the connection between each instrument (device) is required to be tightly matched to minimize the system standing wave ratio. If the voltage standing wave is required to be measured more accurately, multiple sets of |Vi| and |Vri| values can be obtained, and then the average values of |V.μ| and [V| can be calculated. Then the mean values of IV..i and |V.| are calculated according to formula (3) to obtain a more accurate voltage standing wave ratio value. 4.18 Damage level
Take the DCA specified in the product standard as the reference C-value frequency signal, input to the measured frequency meter one minute later, the input voltage amplitude is reduced to the dynamic range, its frequency measurement function should meet the requirements of 4.1. 4.19 Manual trigger level range
Use a bidirectional voltmeter to measure the range of the dynamic trigger level change when the dynamic trigger knob is rotated at the trigger level test point, which should meet the requirements of the product standard.
4.20 Amplitude tolerance (AM)
A frequency signal with a modulation amplitude of \×10% (the signal envelope valley value should meet the sensitivity requirements) specified in the product standard is input to the measured frequency meter, according to 4.1 4.21 Display
GB/T15151.2-94
In the test of 4.1, observe whether the blanking and storage functions are normal. 4.22 Overflow
In the test of 4.1, observe whether the overflow function is positive. 4.23 Connection function
4.23.1 Test block diagram
See Figure 6.
Winning line separation
4.23.2 Test steps
Tested frequency meter
The tested frequency meter is connected to the bus analyzer according to Figure 6, and its interface function is tested according to the requirements of GBm249.1~249.2. 4.24 BCI) code input
4.24.1 Test block diagram
See Figure 7.
Signal generator
4.24.2 Test steps
The frequency meter
BCD input
Input the signal of the signal generator to the input terminal of the frequency meter under test: set the function switch to the "counting" position;
Oscilloscope
(or direct current meter)
Adjust the frequency of the signal generator from low to high, so that the counting circuits of each level of the frequency meter under test appear in the required state, and use an oscilloscope or a DC ammeter to measure the level of the "1" and (" states of the code input logic and the level of the print command signal point by point, which should comply with the provisions of the product standard.
4.25 Maximum power consumption
4.25.1 Test block diagram
AC ammeter
Telephone
4.25-2 Test steps
|Install the AC voltmeter and AC ammeter according to Figure 8: h.
Tested frequency meter
Electrical thin socket
Make the tested frequency meter in the maximum power consumption working state and measure the current and voltage values under the condition of rated power supply voltage, and calculate the maximum power consumption (W value).
Where: P.-power, W
V---AC voltage, V.
.-AC current, A.
Additional instructions:
GB/T15151.2—94
P=V·I
This standard is proposed by the Ministry of Electronics Industry of the People's Republic of China. This standard is under the jurisdiction of the Standardization Research Institute of the Ministry of Electronics Industry. This standard was drafted by Nanjing Telecommunications Instrument Factory and the Standardization Research Institute of the Ministry of Electronics Industry. The main drafters of this standard are Bao Chenghao, Wang Jiahua, Chen Zhen, and Qin Hua. 42 -- 94
Time base output
Voltmeter
Water-tight device
Frequency measurement
Measurement device
The time base output signal of the measured frequency meter is input to the input terminal of the frequency measurement device, and its reading shall comply with the provisions of the product standard: the output voltage and waveform measured by the voltmeter and oscilloscope shall comply with the provisions of the product standard. h
Test requirements
The frequency measurement device shall have an accuracy 10 times higher than that of the measured frequency meter; the connection with the voltmeter and oscilloscope shall consider impedance matching. 4.14 External standard frequency output
Use the external standard frequency input that meets the requirements of the product standard to check the frequency measurement function of the measured frequency meter according to the requirements of 4.1, 1.2 and 41.3. It shall comply with the provisions of the product standard.
4.15 Input channel
Observe that each channel of the measured frequency meter can measure the frequency normally. 4.16 Input attenuation
Use a large signal within the dynamic range to input the frequency meter to be tested, and check whether the input attenuation meets the requirements of one, three, five steps or continuous reduction, and whether the frequency can be measured normally.
4.17 Voltage Standing Wave Ratio (VSWR)
4.17.1 Direct measurement method
Use a network analyzer or a wave ratio bridge: the value of the voltage standing wave ratio can be directly measured. 4.17.2 Voltage measurement method
4.17-2.1 Test block diagram
See Figure 5.
4.17.2.2 Test steps
Disease card makeup generator
(with internal organ system
GB/T 15151-2
According to the measurement
Measurement amplifier
Standard quality
a. According to Figure 5, equip the instrument and microwave device consistent with the frequency band to be measured: h send microwave signal to the measurement line, connect 500 standard load (accessory of the measurement line) to the output end of the measurement line, adjust the variable attenuator to make the measurement amplifier have voltage indication, and fine-tune the external tuning cavity in the measurement line to make it resonate at the signal frequency. At this time, if the measurement amplifier is on, the signal output amplitude can be reduced or the attenuation can be increased or the amplifier amplification can be reduced: move the probe position of the measurement line to find the maximum V and |Vmiml , and make the reading within the range of the tester. At this time, the VSWR of the test system is the smallest; c
Remove the 50n standard load. Press the frequency meter to be tested, and move the probe position of the measuring line. Find the value of the adjacent group |Vl and iVmal: Connect formula (3) to calculate the VSWR, that is: /iVm
WiVial
Change the frequency of the signal generator, repeat steps b and c, and get another set of data. Calculate the VSWR at this frequency. d
4.17.2.3 Test requirements
The measurement should be carried out under small signal conditions to avoid the increase of VSWR measurement error bh. The selected instruments and devices must be consistent with the frequency meter section to be measured; (3
requires that the standing wave ratio of the test system itself can be ignored, the standing wave ratio of each instrument and device itself should be small, and the connection between each instrument (device) is required to be tightly matched to minimize the system standing wave ratio. If the voltage standing wave is required to be measured more accurately, multiple sets of |Vi| and |Vri| values can be obtained, and then the average values of |V.μ| and [V| can be calculated. Then the mean values of IV..i and |V.| are calculated according to formula (3) to obtain a more accurate voltage standing wave ratio value. 4.18 Damage level
Take the DCA specified in the product standard as the reference C-value frequency signal, input to the measured frequency meter one minute later, the input voltage amplitude is reduced to the dynamic range, its frequency measurement function should meet the requirements of 4.1. 4.19 Manual trigger level range
Use a bidirectional voltmeter to measure the range of the dynamic trigger level change when the dynamic trigger knob is rotated at the trigger level test point, which should meet the requirements of the product standard.
4.20 Amplitude tolerance (AM)
A frequency signal with a modulation amplitude of \×10% (the signal envelope valley value should meet the sensitivity requirements) specified in the product standard is input to the measured frequency meter, according to 4.1 4.21 Display
GB/T15151.2-94
In the test of 4.1, observe whether the blanking and storage functions are normal. 4.22 Overflow
In the test of 4.1, observe whether the overflow function is positive. 4.23 Connection function
4.23.1 Test block diagram
See Figure 6.
Winning line separation
4.23.2 Test steps
Tested frequency meter
The tested frequency meter is connected to the bus analyzer according to Figure 6, and its interface function is tested according to the requirements of GBm249.1~249.2. 4.24 BCI) code input
4.24.1 Test block diagram
See Figure 7.
Signal generator
4.24.2 Test steps
The frequency meter
BCD input
Input the signal of the signal generator to the input terminal of the frequency meter under test: set the function switch to the "counting" position;
Oscilloscope
(or direct current meter)
Adjust the frequency of the signal generator from low to high, so that the counting circuits of each level of the frequency meter under test appear in the required state, and use an oscilloscope or a DC ammeter to measure the level of the "1" and (" states of the code input logic and the level of the print command signal point by point, which should comply with the provisions of the product standard.
4.25 Maximum power consumption
4.25.1 Test block diagram
AC ammeter
Telephone
4.25-2 Test steps
|Install the AC voltmeter and AC ammeter according to Figure 8: h.
Tested frequency meter
Electrical thin socket
Make the tested frequency meter in the maximum power consumption working state and measure the current and voltage values under the condition of rated power supply voltage, and calculate the maximum power consumption (W value).
Where: P.-power, W
V---AC voltage, V.
.-AC current, A.
Additional instructions:
GB/T15151.2—94
P=V·I
This standard is proposed by the Ministry of Electronics Industry of the People's Republic of China. This standard is under the jurisdiction of the Standardization Research Institute of the Ministry of Electronics Industry. This standard was drafted by Nanjing Telecommunications Instrument Factory and the Standardization Research Institute of the Ministry of Electronics Industry. The main drafters of this standard are Bao Chenghao, Wang Jiahua, Chen Zhen, and Qin Hua. 4Calculate the voltage standing wave ratio at this frequency. d
4.17.2.3 Test requirements
The measurement needs to be carried out under small signal conditions to avoid the increase of voltage standing wave ratio measurement error. The selected instruments and devices must be consistent with the frequency range being measured; (3
Requires that the standing wave ratio of the test system itself can be ignored, the standing wave ratio of each instrument and device itself should be small, and the connection between each instrument (device) is required to be tightly matched to minimize the system standing wave ratio. dIf the voltage standing wave is required to be measured more accurately, multiple groups of |Vi| and |Vri[values can be obtained, and then the average values of |V.μ| and [V| are calculated. Then the mean values of IV..i and |V.| are calculated according to formula (3) to obtain a more accurate voltage standing wave ratio value. 4.18 Damage level
Use the DCA specified in the product standard C-value frequency signal, input to the measured frequency meter one minute later, the input voltage amplitude is reduced to the dynamic range, its frequency measurement function should meet the requirements of 4.1. 4.19 Manual trigger level range
Use a bidirectional voltmeter to measure the range of the dynamic trigger level change when the dynamic trigger knob is rotated at the trigger level test point, which should meet the requirements of the product standard.
4.20 Amplitude tolerance (AM)
A frequency signal with a modulation amplitude of \×10% (the signal envelope valley value should meet the sensitivity requirements) specified in the product standard is input to the measured frequency meter, according to 4.1 4.21 Display
GB/T15151.2-94
In the test of 4.1, observe whether the blanking and storage functions are normal. 4.22 Overflow
In the test of 4.1, observe whether the overflow function is positive. 4.23 Connection function
4.23.1 Test block diagram
See Figure 6.
Winning line separation
4.23.2 Test steps
Tested frequency meter
The tested frequency meter is connected to the bus analyzer according to Figure 6, and its interface function is tested according to the requirements of GBm249.1~249.2. 4.24 BCI) code input
4.24.1 Test block diagram
See Figure 7.
Signal generator
4.24.2 Test steps
The frequency meter
BCD input
Input the signal of the signal generator to the input terminal of the frequency meter under test: set the function switch to the "counting" position;
Oscilloscope
(or direct current meter)
Adjust the frequency of the signal generator from low to high, so that the counting circuits of each level of the frequency meter under test appear in the required state, and use an oscilloscope or a DC ammeter to measure the level of the "1" and (" states of the code input logic and the level of the print command signal point by point, which should comply with the provisions of the product standard.
4.25 Maximum power consumption
4.25.1 Test block diagram
AC ammeter
Telephone
4.25-2 Test steps
|Install the AC voltmeter and AC ammeter according to Figure 8: h.
Tested frequency meter
Electrical thin socket
Make the tested frequency meter in the maximum power consumption working state and measure the current and voltage values under the condition of rated power supply voltage, and calculate the maximum power consumption (W value).
Where: P.-power, W
V---AC voltage, V.
.-AC current, A.
Additional instructions:
GB/T15151.2—94
P=V·I
This standard is proposed by the Ministry of Electronics Industry of the People's Republic of China. This standard is under the jurisdiction of the Standardization Research Institute of the Ministry of Electronics Industry. This standard was drafted by Nanjing Telecommunications Instrument Factory and the Standardization Research Institute of the Ministry of Electronics Industry. The main drafters of this standard are Bao Chenghao, Wang Jiahua, Chen Zhen, and Qin Hua. 4Calculate the voltage standing wave ratio at this frequency. d
4.17.2.3 Test requirements
The measurement must be carried out under small signal conditions to avoid increasing the voltage standing wave ratio measurement error. The selected instruments and devices must be consistent with the frequency range being measured; (3
Requires that the standing wave ratio of the test system itself can be ignored, the standing wave ratio of each instrument and device itself should be small, and the connections between each instrument (device) are required to be tightly matched to minimize the system standing wave ratio. dIf the voltage standing wave is required to be measured more accurately, multiple groups of |Vi| and |Vri[values can be obtained, and then the average values of |V.μ| and [V| are calculated. Then the mean values of IV..i and |V.| are calculated according to formula (3) to obtain a more accurate voltage standing wave ratio value. 4.18 Damage level
Use the DCA specified in the product standard C-value frequency signal, input to the measured frequency meter one minute later, the input voltage amplitude is reduced to the dynamic range, its frequency measurement function should meet the requirements of 4.1. 4.19 Manual trigger level range
Use a bidirectional voltmeter to measure the range of the dynamic trigger level change when the dynamic trigger knob is rotated at the trigger level test point, which should meet the requirements of the product standard.
4.20 Amplitude tolerance (AM)
A frequency signal with a modulation amplitude of \×10% (the signal envelope valley value should meet the sensitivity requirements) specified in the product standard is input to the measured frequency meter, according to 4.1 4.21 Display
GB/T15151.2-94
In the test of 4.1, observe whether the blanking and storage functions are normal. 4.22 Overflow
In the test of 4.1, observe whether the overflow function is positive. 4.23 Connection function
4.23.1 Test block diagram
See Figure 6.
Winning line separation
4.23.2 Test steps
Tested frequency meter
The tested frequency meter is connected to the bus analyzer according to Figure 6, and its interface function is tested according to the requirements of GBm249.1~249.2. 4.24 BCI) code input
4.24.1 Test block diagram
See Figure 7.
Signal generator
4.24.2 Test steps
The frequency meter
BCD input
Input the signal of the signal generator to the input terminal of the frequency meter under test: set the function switch to the "counting" position;
Oscilloscope
(or direct current meter)
Adjust the frequency of the signal generator from low to high, so that the counting circuits of each level of the frequency meter under test appear in the required state, and use an oscilloscope or a DC ammeter to measure the level of the "1" and (" states of the code input logic and the level of the print command signal point by point, which should comply with the provisions of the product standard.
4.25 Maximum power consumption
4.25.1 Test block diagram
AC ammeter
Telephone
4.25-2 Test steps
|Install the AC voltmeter and AC ammeter according to Figure 8: h.
Tested frequency meter
Electrical socket
Make the tested frequency meter in the maximum power consumption working state and measure the current and voltage values under the condition of rated power supply voltage, and calculate the maximum power consumption (W value).
Where: P.-power, W
V---AC voltage, V.
.-AC current, A.
Additional instructions:
GB/T15151.2—94
P=V·I
This standard is proposed by the Ministry of Electronics Industry of the People's Republic of China. This standard is under the jurisdiction of the Standardization Research Institute of the Ministry of Electronics Industry. This standard was drafted by Nanjing Telecommunications Instrument Factory and the Standardization Research Institute of the Ministry of Electronics Industry. The main drafters of this standard are Bao Chenghao, Wang Jiahua, Chen Zhen, and Qin Hua. 4
Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.