This standard specifies the terminology, technical requirements, test methods, inspection rules, marking, packaging, transportation, storage and other requirements of frequency counters. This standard is applicable to frequency counters whose frequency measurement range partially or completely covers 0Hz to 3GHz. GB/T 15151.1-1994 General Technical Requirements for Frequency Counters GB/T15151.1-1994 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
General Technical Case for Frequency Counters
Cenerlc specification for frequency countersSubject content and scope of application
1.1Subject content
CB/T 15151.1-94
This standard specifies the terminology, technical requirements, test methods, inspection rules, marking, packaging, transportation, storage and other requirements of frequency counters (hereinafter referred to as frequency counters).
1.2Scope of application
This standard is applicable to frequency counters that partially or completely cover the frequency measurement range of 0Hz~3GHz. This standard is the common technical basis for the design, production, use and inspection of frequency counter products, and is also the basis for formulating corresponding product standards for various types of frequency counters.
Various types of frequency counters should have product standards that comply with the provisions of this standard, and the product standards should include other supplementary requirements in accordance with the specific requirements specified in this standard.
2 Reference standards
GB 191
Packaging, storage and transportation pictorial symbols
Basic dimensions series for desktop cases of electronic equipmentGB3047.6
GB4793
Safety requirements for electronic measuring instruments
GB 6587. 1
GB 6587.2
GB 6587. 3
GB 6587. 4
GB 6587.5
General outline for environmental testing of electronic measuring instruments
Temperature test of electronic measuring instruments
Humidity test of electronic measuring instruments
Vibration test of electronic measuring instruments
Shock test of electronic measuring instruments
Transport test of electronic measuring instruments
GB 6587.6
Basic safety test for electronic measuring instruments
GB 6587. 7
GB6587.8 Power supply frequency and voltage test for electronic measuring instrumentsGB6592
GB6593
GB6B33
General provisions for errors of electronic measuring instruments
Quality inspection rules for electronic measuring instruments
Specification for electromagnetic compatibility test of electronic measuring instrumentsGB11463 Operability test for electronic measuring instrumentsGB/T15151.2 Test methods for frequency countersGBn249.1~249.2 Interface systems for programmable measuring instruments (bit parallel, bit parallel format) 3 Terminology
3.1 Electronic counter
f electronic counter
An instrument that uses electronic methods to measure the number of pulses within a certain period of time and displays the results. - generally include frequency counter,
State Administration of Technology approved on July 6, 1994, implemented on February 1, 1995
GB/T 15151. 1-94
Time interval counter, universal counter, micro-frequency counter and special counter. 3.2 Frequency counter Frequency counter is an electronic counter mainly used to measure frequency. 3.3 Time interval counter is an electronic counter mainly used to measure signal time interval. Generally, it measures the time interval between two pulses, and can also measure a pulse width, pulse width, the rise or fall time of the pulse signal edge, etc. 3.4 Universal counter is an electronic counter with more than two functions of measuring rate and time. It should generally have the following functions: measuring frequency, measuring time, measuring period, measuring multiple periods, measuring rate ratio and accumulating count. 3.5 Microwave frequency counter Microwave frequency counter is a frequency meter with the upper limit of frequency measurement reaching the microwave frequency band. 3.6 Special counters All electronic counters with special functions are collectively called special counters, generally including reversible counters, preset counters, program counters and difference counters, etc. They are mainly used in industrial production automation, especially automatic control and automatic measurement. 3.7 Frequency rangebZxz.net
The frequency range in which the instrument can normally measure under certain technical requirements. 3.8 Sensitivity
The amplitude of the minimum input signal when the frequency meter works normally. 3.9 Maximum input
The amplitude of the maximum input signal when the frequency meter works normally. 3.10 Dynamic range
The range from sensitivity to maximum input.
3.11 Input impedance input impedance The impedance presented by the input circuit measured between the input terminal and the ground. 3.12 Attenuator
A device that reduces the voltage value according to a certain ratio. 3.13Accuracy
A quality that characterizes the closeness of the measured indication value to the corresponding true value. The closer the indication value is to the corresponding true value, the higher the accuracy.
3.14Resolution
The minimum change in the signal frequency that can be measured. 3.15Gate time
The time interval of the main gate opening during the measurement process. 3.16Self-check
Use the gate time and time scale in the frequency meter to check the measurement function. 3.17Time base
It is the time base. It is the standard signal output by the crystal oscillator, also known as the time scale signal. 3.18Conventional mode
This mode of frequency meter refers to the gate time being synchronized with the integer of the time scale, and the error is ±1 input signal cycle. 3.19 Reciprocal mode This mode of frequency meter means that the gate time is synchronized with the integer of the input signal period, with an error of ±1 time scale. 3.20 Least significant digit (LSD) For reciprocal mode frequency meters, the unit value of the least significant digit is displayed. For example, for the time scale multiple of Ins: GB/T 15151. 1-94
Display LSI)
Nanmen time quotient × input rate
All LSD calculations must be rounded to the nearest decimal number. For example, 0.8Hz is rounded to 1Hz. 3.21 Trigger error
For reciprocal mode, the measurement error caused by noise and trigger level jitter. For arbitrary waveforms; trigger error = signal slope × peak-to-peak noise voltage 1
For sine waveforms:
Trigger error:
Where: S/N-
-is the signal-to-noise ratio.
For example, for = 100 (40dB):
Input frequency × S/N
Trigger error-
3.22Time base error time base crron
is the relative deviation of the actual value of the time base frequency from the nominal value. 3×10-
Input frequency
3.23Aging rateageing rate
Aging is the relationship between the frequency and time of the crystal oscillator. This long-term frequency drift is caused by the long-term changes in the parameters of the crystal element and (or) other components in the crystal oscillator circuit. The relative drift of the rate value per unit time is called the aging rate. If the unit time is day, week, month, or year, it is called the day, week, month, or year aging rate, respectively.
3.24 Frequency temperature variation frequencylemperaturevariation refers to the relative change of the output frequency of the crystal oscillator relative to the reference temperature when other conditions remain under the reference conditions and within the specified temperature range.
3.25 Frequency voltage variation frequencyvoltagevariation refers to the relative change of the output frequency of the crystal oscillator relative to the reference power supply voltage when other conditions remain under the reference conditions and the power supply voltage is within the specified variation range. 3.26 Warm up characteristic warm up characteristic The maximum change of the rate value within a period of time after the crystal oscillator is initially warmed up. 3.27 day frequency stability (day frequency fluctuation) The maximum relative change value of the crystal oscillator output frequency within 24h after the specified warm-up time when the external conditions remain relatively stable. 3.28 ls frequency stability for 1s The degree of random fluctuation of the average frequency of the crystal oscillator within a 1s time interval. The Is time interval is called the sampling time. 3.29 frequency accuracy refers to the relative deviation between the actual value and the nominal value of the crystal oscillator frequency. GB/T15151.1—94
3.30 frequency adjustment range frequencyadjust range The range of changing the output frequency through a variable element without disassembling the crystal oscillator. 3.31 frequency load variation frequencyload variation refers to the relative change of the output frequency of the crystal oscillator relative to the nominal load impedance when other conditions remain under the reference conditions and the load impedance is within the specified variation range. 3.32 Frequency repeatability After the output frequency of the crystal oscillator is stable, the power supply is disconnected for a period of time, and then the power supply is turned on again. Within the specified working time, the output frequency returns to the stable frequency before the power supply is disconnected. It is usually measured by the relative frequency difference between the two output frequencies. 3.33 Input channel
is the input amplification and shaping component. Their function is to amplify the measured signal and convert it into a pulse that meets the requirements of the counting circuit. 4 Technical requirements
4.1 Frequency range
The frequency measurement range should be given in the product standard. 4.2 Sensitivity
Should comply with formula (5):
n×0.lmV<sine wave)
Where: n-
is an integer from 1 to 10,000.
It is allowed to make regulations in different frequency bands. For the 1～3(>Hz frequency band, the corresponding sensitivity millisecond value must be indicated. 4.3 Dynamic range
Sensitivity should be given as ~n×maximum input voltage (V)×preset attenuation value, where n is an integer from 1 to 10.
4.4 Input impedance
The input resistance should meet the requirements of: ≥1Mα including 500kn or including 100k; the input capacitance should meet the requirements of; ≤n×5pF. Where: n is an integer from 1 to 20. The input impedance can be set as needed.
4.5 Waveform adaptability
It should at least be able to adapt to a sine signal with an amplitude modulation of 30% (the valley value of its envelope should meet the sensitivity requirements). 4. 6 Accuracy
Input frequency gate time
± time base error
In the product standard, it can be simplified as:
± 1 digit ± time base error (traditional method) XLSD
Trigger error
± time base error (reciprocal method)
Input frequency
(Pulse time
(5)
(9)
In Chinese: n
can be 1, 2.
4.7 Resolution
± 1 digit (traditional method)
GB/T 15151. 1—94
± (nXI.SD) ± 1. 4×
Where: n—
can be 1,2.
4.8 Gate time
Trigger error
X Input frequency (inverse mode)
Gate time
There should be the following two gate times: 0, 1s, 1s (traditional mode). 4. 9 Measurement indication
It should be able to indicate that the measurement is in progress.
4.10 Display
（10）
All panel displays should be clearly readable at a distance of 1m at a 45\ diagonal angle. The characters should be single-sided digital displays in horizontal rows. The measurement unit should be selected from Hz, kHz, MHz, GHz, and the decimal point should be automatically positioned. 4. 11 Self-test
It should have a self-test function.
4. 12 Time base
It should be the following value specified in the product standard. 4. 12. 1 Nominal frequency: 10,5,1MHz or 100kHz4.12.2 Aging rate:
≤×10\#/month, year, week or day
In the formula, n-
can be 1,3.5:
can be an integer from 5 to 11.
4.12.3 Frequency temperature aging: 0～40℃: reference 20±2℃nX10-2
In the formula: n
can be 1,3,5;
can be an integer from 4 to 11.
4.12.4 Frequency change: ±10%
In the formula: n-
can be 1,3,5;
- can be an integer from 4 to 11.
Base 220V±2%
（13）| ...
4.75 Input channel
Multiple input channels can be specified, named input channel A, input channel B, and input channel C. 4.16 Input attenuation
The attenuation should meet the requirements of 1, 3, 5, 10 or continuous attenuation. 4.17 Voltage standing wave ratio (VSWR)
Should meet the requirements of ≤1.5, 2.0, 2.5 or 3.0. 4.18 Coupling
AC, DC or one of them.
4.19 Damage level
The DC+ACr--value should be specified in the product standard, and can be specified in frequency bands. 4.20 Low-pass filter
The frequency nominal value and noise suppression capability should be specified in the product standard. 4.21 Manual trigger level range
The variable range should meet the following requirements:
×（-1~+1V)× plug reduction period
Wu, n-
- can be 0.1, 0.2, 0.3.0.5.1, 2, 3, 5. 4.22 Amplitude modulation tolerance (AM)
n×10%
Note: The valley value of the signal envelope should meet the sensitivity requirements. In the formula: -
- can be an integer from 4 to 9.
4.23 Display
Blanking: All leading invalid zeros should be blanked. Storage; memory and non-memory display, or one of the two methods can be used. 4.24 Overflow
When the maximum number is exceeded, there should be an obvious indication. 4.25 Interface requirements
For frequency meters with programmable functions, their interfaces shall comply with the requirements of GBn249.1~249.2. 4.26 BCD output
(15)
BCD code is provided for each bit, plus overflow, unit, decimal point and print command. The level is TTL level or MOS level. 4.27 Special requirements
Special technical requirements not specified in this standard shall be given in the product standard. 4.28 Environmental requirements
Should comply with the provisions of GB6587.1~6587.6. The environmental test group and transportation and circulation condition level of the frequency meter shall be specified in the product standard.
4.29 Other requirements
GB/T 15151. 1-94
4.29.1 Input and output plug socket system--Use Q9 and L16 plug sockets. 4.29.2 The warm-up time of the instrument, except for the crystal oscillator, should be normal after 3 minutes of power-on. For frequency meters with a crystal oscillator warm-up time of more than 1 hour, the crystal oscillator power supply should be separated from the host power supply and ensure the ability to work for a long time. 4.29.3 The AC power supply frequency and voltage range should comply with the provisions of GB6587.8. 4.29.4 Battery-powered instruments should state the battery specifications, the number of hours the battery can guarantee normal operation and the minimum voltage for battery replacement. 4.29.5 The maximum power consumption should be given in the product standard. 4.29.6 Overload protection device (such as fuse, overload relay, thermal circuit breaker) and its cut-off value. 4.29.7 Quality
The quality of the whole machine should be stated in the product standard.
4.29.8 The overall dimensions of the instrument are ×6×, mm. They should comply with the provisions of GB3047.6. 4.29.9 Appearance and structural requirements
The structure should be complete, without obvious mechanical damage and coating damage. Each control should be installed correctly, firm and reliable, and flexible to operate. 4.30, Reliability requirements
Should comply with the requirements of GB 11453, and the mean time between failures (MTBF) value and the selected test plan should be given in the product standard. 4.31 Electromagnetic compatibility requirements should comply with the provisions of GB6833 4.32 Safety requirements should comply with the provisions of GB4793 and GB6587.7, and the safety category of the instrument should be stated. According to the safety category, the values ​​of insulation resistance, leakage current, and dielectric strength voltage should be given in the product standard. 5 Test methods
5. 1 Test conditions
Should comply with the provisions of GB 6592 and product standards. 5.2 Test instrument requirements
Requirements for the instruments to be used shall comply with the provisions of GB6592. 5.3 Test methods for performance characteristics
Should comply with the provisions of GB/T15151.2.
5.4 Environmental tests
Should comply with the provisions of GB6587.1~6587.6, 5.5 Electromagnetic compatibility tests
Should comply with the provisions of GB6833.
5.6 Reliability tests
Should comply with the provisions of GB11463.
5.7 Safety tests
Should comply with the provisions of GB 4793 and GB 6587.7. 5.8 Power supply current and voltage test
Should be carried out in accordance with the provisions of GB 6587.8. 6 Inspection rules
Should comply with the provisions of GB 6593.
6.1 Identification inspection
Should be carried out in accordance with the provisions of Article 3.5 of GB 6593. All performance characteristics should be tested in the inspection. 6.2 Quality-conformity inspection
The performance characteristics of each group of inspections are shown in Table 1.
GB/T 15151. 1-94
Group A inspection: The number of defects shall generally not exceed 20, or the number of unqualified products shall not exceed 5 units, and fatal defects shall not be allowed. The specific number of defects shall be specified in the product standard.
Group B inspection: AQL shall not exceed 6.5,
Inspection level, S-3.
The specific value of AQ1 shall be specified in the product standard. C group inspection: AQI is not more than 25; inspection level S-1. AQI should be specified in the product standard. Specific values ​​Table 1 Performance characteristics items for quality consistency inspection Technical requirements Performance characteristics Frequency range Sensitivity Dynamic range Input impedance Waveform adaptability Accuracy Resolution Gate time Measurement indication ||Time base output
External standard input
Input attenuation
Voltage standing wave ratio
Ring level
Low pass filter
Manual trigger level range
Test items for each group in quality conformity inspection Group B
Corresponding clause
GB/T15151.1
Continued table 1
Performance characteristics
Interface requirements
BCD Output
Environmental requirements
Input and output plugs
Instrument warm-up time
AC power supply voltage and frequency range
Battery specifications
Maximum power consumption
Overload protection
Instrument dimensions
Appearance and structural requirements
Reliability requirements
Electromagnetic compatibility requirements
Basic safety requirements
Note: Indicates items that must be inspected, ○ indicates items that are inspected when necessary, 7 Marking, packaging, transportation, storage
7.1 Contents of instrument marking
7.1.1 Name and model.
7.1.2 Serial number.
7.1.3 Production date.
7.2 Contents of packaging box marking
7.2.1 Name and trademark (code) of the manufacturer. 7.2.2 Name and model of the product.
7.2.3 Year and month of packing.
7.2.4 Gross mass.
7.2.5 Dimensions of the packing box.
Test items for each group in the mass leakage consistency test A
GB/T15151.1—94
7.2.6 Other storage and transportation indications of the packing box shall comply with the provisions of GB191. 7.3 Instrument packaging
The packaging of the instrument shall be based on the specified storage and transportation conditions, and appropriate packaging shall be adopted to ensure that the instrument is not damaged during transportation.
7.4 Storage
7.4.1. Warehouse requirements:
There should be heating, heat preservation, ventilation and cooling equipment, and it should be kept dry, and there should be no acid, splashing and corrosive gas in the air. Especially strong mechanical vibration impact, strong electromagnetic field and sunlight, should not be close to the ground, four walls and roof. 7.4.2 Storage period
When the storage period exceeds six months, it should be taken out of the packaging box. After power-on re-inspection, it can be placed in the warehouse. Additional remarks:
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 Institute of the Ministry of Electronics Industry. This standard was drafted by Nanjing Telecommunications Instrument Factory and the Standardization Institute of the Ministry of Electronics Industry. The main drafters of this standard are Bao Chenghao, Wang Jiahua, Chen Zhen and An Hua.Specific numerical values ​​Table 1 Performance characteristics items for quality consistency inspection Technical
Corresponding clauses
Technical requirements
Performance characteristics
Frequency range
Sensitivity
Dynamic range
Input impedance
Waveform adaptability
Accuracy
Resolution
Gate time
Measurement indication
Time base output ||t t||External standard input
Input attenuation
VSWR
Ring level
Low-pass filter
Manual trigger level range
Test items for each group in quality conformity inspection Group B
Corresponding clause
GB/T15151.1
Continued Table 1
Performance characteristics
Interface requirements
BCD Output
Environmental requirements
Input and output plugs
Instrument warm-up time
AC power supply voltage and frequency range
Battery specifications
Maximum power consumption
Overload protection
Instrument dimensions
Appearance and structural requirements
Reliability requirements
Electromagnetic compatibility requirements
Basic safety requirements
Note: Indicates items that must be inspected, ○ indicates items that are inspected when necessary, 7 Marking, packaging, transportation, storage
7.1 Contents of instrument marking
7.1.1 Name and model.
7.1.2 Serial number.
7.1.3 Production date.
7.2 Contents of packaging box marking
7.2.1 Name and trademark (code) of the manufacturer. 7.2.2 Name and model of the product.
7.2.3 Year and month of packing.
7.2.4 Gross mass.
7.2.5 Dimensions of the packing box.
Test items for each group in the mass leakage consistency test A
GB/T15151.1—94
7.2.6 Other storage and transportation indications of the packing box shall comply with the provisions of GB191. 7.3 Instrument packaging
The packaging of the instrument shall be based on the specified storage and transportation conditions, and appropriate packaging shall be adopted to ensure that the instrument is not damaged during transportation.
7.4 Storage
7.4.1. Warehouse requirements:
There should be heating, heat preservation, ventilation and cooling equipment, and it should be kept dry, and there should be no acid, splashing and corrosive gas in the air. Especially strong mechanical vibration impact, strong electromagnetic field and sunlight, should not be close to the ground, four walls and roof. 7.4.2 Storage period
When the storage period exceeds six months, it should be taken out of the packaging box. After power-on re-inspection, it can be placed in the warehouse. Additional remarks:
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 Institute of the Ministry of Electronics Industry. This standard was drafted by Nanjing Telecommunications Instrument Factory and the Standardization Institute of the Ministry of Electronics Industry. The main drafters of this standard are Bao Chenghao, Wang Jiahua, Chen Zhen and An Hua.Specific numerical values ​​Table 1 Performance characteristics items for quality consistency inspection Technical
Corresponding clauses
Technical requirements
Performance characteristics
Frequency range
Sensitivity
Dynamic range
Input impedance
Waveform adaptability
Accuracy
Resolution
Gate time
Measurement indication
Time base output ||t t||External standard input
Input attenuation
VSWR
Ring level
Low-pass filter
Manual trigger level range
Test items for each group in quality conformity inspection Group B
Corresponding clause
GB/T15151.1
Continued Table 1
Performance characteristics
Interface requirements
BCD Output
Environmental requirements
Input and output plugs
Instrument warm-up time
AC power supply voltage and frequency range
Battery specifications
Maximum power consumption
Overload protection
Instrument dimensions
Appearance and structural requirements
Reliability requirements
Electromagnetic compatibility requirements
Basic safety requirements
Note: Indicates items that must be inspected, ○ indicates items that are inspected when necessary, 7 Marking, packaging, transportation, storage
7.1 Contents of instrument marking
7.1.1 Name and model.
7.1.2 Serial number.
7.1.3 Production date.
7.2 Contents of packaging box marking
7.2.1 Name and trademark (code) of the manufacturer. 7.2.2 Name and model of the product.
7.2.3 Year and month of packing.
7.2.4 Gross mass.
7.2.5 Dimensions of the packing box.
Test items for each group in the mass leakage consistency test A
GB/T15151.1—94
7.2.6 Other storage and transportation indications of the packing box shall comply with the provisions of GB191. 7.3 Instrument packaging
The packaging of the instrument shall be based on the specified storage and transportation conditions, and appropriate packaging shall be adopted to ensure that the instrument is not damaged during transportation.
7.4 Storage
7.4.1. Warehouse requirements:
There should be heating, heat preservation, ventilation and cooling equipment, and it should be kept dry, and there should be no acid, splashing and corrosive gas in the air. Especially strong mechanical vibration impact, strong electromagnetic field and sunlight, should not be close to the ground, four walls and roof. 7.4.2 Storage period
When the storage period exceeds six months, it should be taken out of the packaging box. After power-on re-inspection, it can be placed in the warehouse. Additional remarks:
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 Institute of the Ministry of Electronics Industry. This standard was drafted by Nanjing Telecommunications Instrument Factory and the Standardization Institute of the Ministry of Electronics Industry. The main drafters of this standard are Bao Chenghao, Wang Jiahua, Chen Zhen and An Hua.
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