Some standard content:
National Metrology Verification Regulation of the People's Republic of China JJG723—2008
Time Interval Generator
Promulgated on 2008-03-25
Implementation on 2008-09-25
Promulgated by the General Administration of Quality Supervision, Inspection and Quarantine JJG723-—2008
Verification Regulation of
TimeIntervalGenerator
JJG723--2008
Replaces JJG723—1991
JJG803—-1993
This regulation was approved by the General Administration of Quality Supervision, Inspection and Quarantine on March 25, 2008, and came into effect on September 25, 2008.
Responsible unit: National Technical Committee for Time and Frequency Metrology Drafting unit: Hebei Institute of Metrology This regulation entrusts the National Technical Committee for Time and Frequency Metrology to be responsible for the interpretation of this regulation Drafters of this regulation:
JJG723-2008
Bai Lijun (Hebei Institute of Metrology) Huang Jianzhe (Hebei Institute of Metrology) Su Guan (Hebei Institute of Metrology) 1
Metrological performance requirements
4.1 Internal crystal oscillator
4.2 Time interval output
4.3 Pulse output
5 General technical requirements·
5.1 Appearance and logo·
5.2 Other requirements
6 Measurement Measuring instrument control
6.1 Verification conditions.
6.2 Verification items.
6.3 Verification method
6.1 Processing of verification results
6.5 Verification cycle·
Appendix A Verification certificate (inner page) format
JJG723—2008
(1)
(2)
(3)
(3)
1 Scope
JJG723-2008
Verification procedure for time interval generator
This procedure applies to the initial verification, subsequent verification and in-service inspection of time interval generators with an output range of 10ns to 10000s.
2 Overview
U.S. crystal oscillator oscillation period as the standard, time interval generator also shift
is a high stability
speed can be set pulse period, delay pulse width and other time intervals using digital synthesis technology,
signal.
Time interval generator
can be used as a standard source
3 Terminology
Pulse width
Pre-pulse
3.2 Delay date
Synchronous pulse
Metering performance
General application
pulsewidth)
City point to the middle point of the trailing edge
(time delay)
Input pulse midpoint to output pulse standard
In-machine crystal
Output step
oscillator
MHz, 5 MF
Power-on characteristics
Daily frequency fluctuation
Daily aging rate
1 second frequency stability
(10-8~
Time along the midpoint
Time control coefficient
In the calibration time measuring instrument
10~1×10-12
AOMETROLOGY
Frequency reproducibility: 1>
Frequency accuracy: 1×10
Time interval output
Output range: 10ns～10000s
1.2.2 Output Output mode:
The pulse period and pulse width of a single output pulse train; the time interval between two output pulse trains, etc. The time interval generator can have multiple output channels, and the polarity of the output pulse can be positive or negative, with logical positive pulses and reverse pulses.
4.2.3 Maximum allowable error of time interval: ±(T×crystal frequency accuracy+△). T is the given time interval; △ is the maximum error introduced by the crystal oscillator, which is given in the manual of the instrument under test. 1
4.3 Pulse output
JJG723—2008
4.3.1 Pulse Amplitude: 0.5V~10V continuously adjustable or a fixed value in between; Maximum allowable error: ±(5%×output amplitude value + 50mV). 4.3.2 Output pulse rise time: ≤10ns; Output pulse fall time: ≤10ns Note: The above are the measurement range and maximum allowable error requirements of the parameters of the time interval generator. During the calibration, the technical parameters given in the instruction manual of the time interval generator to be tested shall prevail. 5 General technical requirements
5.1 Appearance and marking
The appearance of the time interval generator should be free of defects and mechanical damage that affects normal operation. The time interval generator should There are markings such as instrument name, specification model, manufacturer's name, manufacturing date, factory number and power supply requirements.
5.2 Other requirements
The time interval generator should have an internal crystal frequency or time base signal output port and an external frequency standard input port. The control knob, key switch and input and output ports of the time interval generator should be firmly installed; various function switches and keys should be flexible and reliable.
When the time interval generator is sent for inspection, it should be accompanied by the instruction manual and the verification certificate of the last verification. 6 Measuring instrument control
Measuring instrument control includes initial verification, subsequent verification and in-use inspection. 6.1 Verification conditions
6.1.1 Environmental conditions
6.1.1.1 Ambient temperature: any point within the range of (15~30)℃, the change of ambient temperature during the verification process shall not exceed ±2℃, and there should be no sudden temperature change.
6.1.1.2 Ambient relative humidity ≤80%.
6.1.1.3 Power supply voltage: 2201±10%)V; frequency: (50±2)Hz. 6.1.1.4 There should be no electromagnetic field and mechanical vibration around that affect the normal calibration work. 6.1.2 Standard equipment for calibration
6.1.2.1 Reference frequency standard
The output frequency of the reference frequency standard is 1MHz, 5MHz or 10MHz. The frequency stability should be better than 3 times the frequency stability of the crystal oscillator of the time interval generator being tested, and other indicators should be one order of magnitude better than the corresponding indicators of the crystal oscillator being tested. 6.1.2.2 Frequency standard comparator
Input signal: 1MHz, 5MHz or 10MHz
Comparison uncertainty: (3×10-11～3×10-13)/s6.1.2.3 General electronic counter
Measurement range: 10Hz～100MHz, and it should have an external frequency standard function. 6.1.2.4 Time interval measuring instrument
Measurement range: 1ns～10000s, and it should have external frequency marker function. 2
JJG723—2008
The trigger level is continuously adjustable within the range of -5V～5V, and the trigger level display resolution should be better than 10mV6.1.2.5 Oscilloscope
The pulse establishment time should be less than 1/3 of the pulse rise time and pulse fall time of the time interval generator under test. The voltage measurement range covers the adjustable range of the output amplitude of the time interval generator under test, and the measurement error should be less than 1/3 of the pulse output amplitude error of the time interval generator under test.6.2 Verification items
See Table 1.
List of verification items
Verification items
Appearance and normal working inspection
Internal crystal oscillator
Continuous pulse period
Continuous pulse width
Single pulse width
Delay time
Time interval between two single pulses (step voltage)Pulse rise time and fall time
Pulse amplitude
First verification
Subsequent verification
In-use inspection
Note: "X" means items to be inspected, "I" means items that may not be inspected, and "*" means items that may not be inspectedDaily frequency fluctuation and daily aging rate. 6.3 Verification method
Verification of continuous pulse period
The instrument connection is shown in Figure 1.
Tested time interval
Reference frequency standard
Time interval measuring instrument
Figure 1 Measurement of continuous pulse period
Tested time interval generator function is set to "pulse period output", and the output amplitude is 1V. Generator
Pulse output
The function of the time interval measuring instrument is set to "period measurement". Select an appropriate gate time and read the period value. Selection of verification points: The minimum output value is the first verification point, and the remaining points are increased by 10 times, and the last verification point is the maximum output value. Each verification point is measured at least 3 times, and the average value is taken as the actual value of the point. Calculate the error of the output pulse period according to formula (1): error - nominal value - actual value
6.3.2 Verification of continuous pulse width
The instrument connection is shown in Figure 2.
Reference frequency standard
JJG723—2008
Time interval measuring instrument
Figure 2 Measurement of continuous pulse width
In the verification of this item and the following items
, the coaxial cable lines of equal length are used.
6.3.2.1 Positive pulse width
The time interval to be tested occurs
as 1V.
The input polarity setting
Time interval measurement
The function setting of the time interval measuring instrument
is
set to "ten" respectively
and all are 0.5V, and the trigger residue
is selected in the same way as in 6.3.1.
Calculate the error of continuous pulse according to formula (1)
6.3.2.2 Negative pulse
generator output polarity is set
to start and stop the channel
width value during the time under test. Calibration point
Calculate the
generator level according to formula (1)
to be 10
The selection of the number of temperature measurements is the same as 6
Continuous pulse error
6.3.3 Single pulse width
Given
The instrument connection is as shown in the figure
to set the output polarity of the generator to 1V during the time under test.
According to the method of 6.3.2.1, 6.3.4 Delay time verification. The instrument connection is shown in Figure 3.
Reference frequency standard
", measuring pulse
Tested time interval
Generator
Pulse output
When the two input lines use the same standard
Adjust the trigger level
width value of the start and stop channels.
Verification point
and||the number of measurements
1V, adjust the time
trigger slope division
function setting
and the interval measuring instrument
measure the pulse
pulse width
MEROLOGY PUE
Output amplitude
Tested time interval
Time interval measuring instrument
Figure 3 Delay time measurement
Generator
The tested time interval generator is set to internal trigger, output polarity is set to "ten", function is set to "delay time output", and output amplitude is 1V.
JJG723-—2008
The function of the time interval measuring instrument is set to "time interval measurement". Adjust the trigger levels of the start and stop channels to 50% and 0.5V of the synchronization pulse amplitude respectively, set the trigger slope to "ten", and measure the delay time value. Calibration points and number of measurements The selection is the same as in 6.3.1.
The output polarity of the time interval generator to be tested is set to "1", the output amplitude is -1V, and the trigger levels of the start and stop channels of the time interval measuring instrument are adjusted to 50% of the synchronization pulse amplitude and -0.5V respectively. The trigger slope is set according to the polarity and the delay time value is measured. The selection of the calibration point and the number of measurements is the same as in 6.3.1. The error of the delay time
is calculated according to formula (1). 6.3.5 Calibration of the time interval between two single pulses (step voltage) The time interval generator to be tested can output a single channel. The connection of the combined version of the double sand instrument is shown in Figure 2: The two pulses of the time interval generator to be tested
consist of two When the output is different, the instrument is connected as shown in Figure 4. HOU
reference frequency
tested time
time port interval
tested time interval
generator
pulse 1
pulse 2
Figure 4 Measurement of two single pulse time intervals
"Ten", the function is set to "double pulse output" interval generator output polarity set
time interval measurement instrument function setting
both are 0.5V
fixed point and measurement
slope are both set to "
" and the selection is the same as in 6.3.1
"Time interval measurement: Output two single pulses. The output polarity of the time interval generator to be tested is set to start and stop. The trigger levels of both channels are the time interval value. Adjust the start and stop (step voltage) output amplitudes to -1V and 5V. The trigger slopes are set to the same 6 elements. Select the fixed points and the number of measurements. Calculate the error of the time interval between the two single pulses according to formula (1). The instrument connection is as shown in the figure. The time interval error of the pulse rise and fall time is calculated. The output amplitude is 1V. The trigger level of the channel is the time interval value. The time interval measuring instrument can produce the time interval between two single pulses. The measured time interval is shown in Figure 5. The measurement of pulse rise time and fall time. The output polarity of the measured time interval generator is set to "+", the function is set to "pulse width output", the output amplitude is 1V, and the output pulse width is the minimum output value. The oscilloscope is matched with the time interval generator and connected. The oscilloscope is adjusted to obtain a stable pulse waveform with an amplitude of about 80% of the effective height of the screen on the screen. The time interval corresponding to the pulse amplitude rising from 10% to 90% is the pulse rise time, and the time interval corresponding to the pulse amplitude falling from 90% to 10% is the pulse fall time. 5
6.3.7 Pulse amplitude verification
The instrument connection is shown in Figure 5.
JJG723—2008
The output polarity of the time interval generator under test is set to "+", the function is set to "pulse width output", the output amplitude is minimum, and the output pulse width is 1ms.
The oscilloscope is matched with the time interval generator and connected. The oscilloscope is adjusted to obtain a stable pulse waveform with an amplitude of more than 50% of the effective height of the screen on the screen. Measure the amplitude value U. of the pulse waveform. Change the output amplitude U. of the time interval generator under test to 1V, 3V, 5V, 8V, and 10V in sequence, and repeat the above measurement.
The output pulse amplitude error is calculated according to formula (2): 8=(U.-U)/U,X100%
Where: pulse amplitude error;
U. Actual value of pulse amplitude;
U. Nominal value of pulse amplitude.
Note: When the pulse output amplitude of the time interval generator under test is a fixed value, the calibration is only performed at the fixed output amplitude value. 6.4 Handling of verification results
According to the provisions and requirements of this regulation, a verification certificate shall be issued for time interval generators that pass the verification items; if the verification fails, a verification result notice shall be issued, indicating the failed items. 6.5 Verification cycle
The verification cycle of the time interval generator is 1 year. 6
Appendix A
JJG723-2008
Verification certificate (inner page) format
A.1Verification certificate (inner page) format
1.Verification of crystal oscillator inside the machine
Power-on characteristics
Daily frequency fluctuation
Daily aging rate
1s frequency stability
Frequency reproducibility
Frequency accuracy
2.Verification of continuous pulse period
Nominal value of period
Measured value||tt ||Test results
3.Test of continuous pulse width
Nominal value
Pulse amplitude: +1V
Measured value
Single pulse width
Nominal value
JJG723—2008
Measured value
Pulse amplitude: -1V
ONHSTHAN
Pulse amplitude: +1V
Pulse amplitude:
PUBLISHING
MIETROLOGYVerification of continuous pulse width
Nominal value
Pulse amplitude: +1V
Measured value
Single pulse width
Nominal value
JJG723—2008
Measured value
Pulse amplitude: -1V
ONHSTHAN
Pulse amplitude: +1V
Pulse amplitude:
PUBLISHING
MIETROLOGYVerification of continuous pulse width
Nominal value
Pulse amplitude: +1V
Measured value
Single pulse width
Nominal value
JJG723—2008
Measured value
Pulse amplitude: -1V
ONHSTHAN
Pulse amplitude: +1V
Pulse amplitude:
PUBLISHING
MIETROLOGY2 Verification of continuous pulse width
The instrument connection is shown in Figure 2.
Reference frequency standard
JJG723—2008
Time interval measuring instrument
Figure 2 Measurement of continuous pulse width
In the verification of this item and the following items
, the coaxial cable lines of equal length are used.
6.3.2.1 Positive pulse width
The time interval to be tested is 1V.
The input polarity is set
Time interval measurement
The function setting of the time interval measuring instrument
is
set to "ten" respectively
all are 0.5V, and the trigger residue
is selected in the same way as in 6.3.1.
Calculate the error of continuous pulse according to formula (1)
6.3.2.2 Negative pulse
generator output polarity is set
to start and stop the channel
width value during the time under test. Calibration point
Calculate the
generator level according to formula (1)
to be 10
The selection of the number of temperature measurements is the same as 6
Continuous pulse error
6.3.3 Single pulse width
Given
The instrument connection is as shown in the figure
to set the output polarity of the generator to 1V during the time under test.
According to the method of 6.3.2.1, 6.3.4 Delay time verification. The instrument connection is shown in Figure 3.
Reference frequency standard
", measuring pulse
Tested time interval
Generator
Pulse output
When the two input lines use the same standard
Adjust the trigger level
width value of the start and stop channels.
Verification point
and||the number of measurements
1V, adjust the time
trigger slope division
function setting
and the interval measuring instrument
measure the pulse
pulse width
MEROLOGY PUE
Output amplitude
Tested time interval
Time interval measuring instrument
Figure 3 Delay time measurement
Generator
The tested time interval generator is set to internal trigger, output polarity is set to "ten", function is set to "delay time output", and output amplitude is 1V.
JJG723-—2008
The function of the time interval measuring instrument is set to "time interval measurement". Adjust the trigger levels of the start and stop channels to 50% and 0.5V of the synchronization pulse amplitude respectively, set the trigger slope to "ten", and measure the delay time value. Calibration points and number of measurements The selection is the same as in 6.3.1.
The output polarity of the time interval generator to be tested is set to "1", the output amplitude is -1V, and the trigger levels of the start and stop channels of the time interval measuring instrument are adjusted to 50% of the synchronization pulse amplitude and -0.5V respectively. The trigger slope is set according to the polarity and the delay time value is measured. The selection of the calibration point and the number of measurements is the same as in 6.3.1. The error of the delay time
is calculated according to formula (1). 6.3.5 Calibration of the time interval between two single pulses (step voltage) The time interval generator to be tested can output a single channel. The connection of the combined version of the double sand instrument is shown in Figure 2: The two pulses of the time interval generator to be tested
consist of two When the output is different, the instrument is connected as shown in Figure 4. HOU
reference frequency
tested time
time port interval
tested time interval
generator
pulse 1
pulse 2
Figure 4 Measurement of two single pulse time intervals
"Ten", the function is set to "double pulse output" interval generator output polarity set
time interval measurement instrument function setting
both are 0.5V
fixed point and measurement
slope are both set to "
" and the selection is the same as in 6.3.1
"Time interval measurement: Output two single pulses. The output polarity of the time interval generator to be tested is set to start and stop. The trigger levels of both channels are the time interval value. Adjust the start and stop (step voltage) output amplitudes to -1V and 5V. The trigger slopes are set to the same 6 elements. Select the fixed points and the number of measurements. Calculate the error of the time interval between the two single pulses according to formula (1). The instrument connection is as shown in the figure. The time interval error of the pulse rise and fall time is calculated. The output amplitude is 1V. The trigger level of the channel is the time interval value. The time interval measuring instrument can produce the time interval between two single pulses. The measured time interval is shown in Figure 5. The measurement of pulse rise time and fall time. The output polarity of the measured time interval generator is set to "+", the function is set to "pulse width output", the output amplitude is 1V, and the output pulse width is the minimum output value. The oscilloscope is matched with the time interval generator and connected. The oscilloscope is adjusted to obtain a stable pulse waveform with an amplitude of about 80% of the effective height of the screen on the screen. The time interval corresponding to the pulse amplitude rising from 10% to 90% is the pulse rise time, and the time interval corresponding to the pulse amplitude falling from 90% to 10% is the pulse fall time. 5
6.3.7 Pulse amplitude verification
The instrument connection is shown in Figure 5.
JJG723—2008
The output polarity of the time interval generator under test is set to "+", the function is set to "pulse width output", the output amplitude is minimum, and the output pulse width is 1ms.
The oscilloscope is matched with the time interval generator and connected. The oscilloscope is adjusted to obtain a stable pulse waveform with an amplitude of more than 50% of the effective height of the screen on the screen. Measure the amplitude value U. of the pulse waveform. Change the output amplitude U. of the time interval generator under test to 1V, 3V, 5V, 8V, and 10V in sequence, and repeat the above measurement.
The output pulse amplitude error is calculated according to formula (2): 8=(U.-U)/U,X100%
Where: pulse amplitude error;
U. Actual value of pulse amplitude;
U. Nominal value of pulse amplitude.
Note: When the pulse output amplitude of the time interval generator under test is a fixed value, the calibration is only performed at the fixed output amplitude value. 6.4 Handling of verification results
According to the provisions and requirements of this regulation, a verification certificate shall be issued for time interval generators that pass the verification items; if the verification fails, a verification result notice shall be issued, indicating the failed items. 6.5 Verification cycle
The verification cycle of the time interval generator is 1 year. 6
Appendix A
JJG723-2008
Verification certificate (inner page) format
A.1Verification certificate (inner page) format
1.Verification of crystal oscillator inside the machine
Power-on characteristics
Daily frequency fluctuation
Daily aging rate
1s frequency stability
Frequency reproducibility
Frequency accuracy
2.Verification of continuous pulse period
Nominal value of period
Measured value||tt ||Test results
3.Test of continuous pulse width
Nominal value
Pulse amplitude: +1V
Measured value
Single pulse width
Nominal value
JJG723—2008
Measured value
Pulse amplitude: -1V
ONHSTHAN
Pulse amplitude: +1V
Pulse amplitude:
PUBLISHING
MIETROLOGY2 Verification of continuous pulse width
The instrument connection is shown in Figure 2.
Reference frequency standard
JJG723—2008
Time interval measuring instrument
Figure 2 Measurement of continuous pulse width
In the verification of this item and the following items
, the coaxial cable lines of equal length are used.
6.3.2.1 Positive pulse width
The time interval to be tested is 1V.
The input polarity is set
Time interval measurement
The function setting of the time interval measuring instrument
is
set to "ten" respectively
all are 0.5V, and the trigger residue
is selected in the same way as in 6.3.1.
Calculate the error of continuous pulse according to formula (1)
6.3.2.2 Negative pulse
generator output polarity is set
to start and stop the channel
width value during the time under test. Calibration point
Calculate the
generator level according to formula (1)
to be 10
The selection of the number of temperature measurements is the same as 6
Continuous pulse error
6.3.3 Single pulse width
Given
The instrument connection is as shown in the figure
to set the output polarity of the generator to 1V during the time under test.
According to the method of 6.3.2.1, 6.3.4 Delay time verification. The instrument connection is shown in Figure 3.
Reference frequency standard
", measuring pulse
Tested time interval
Generator
Pulse output
When the two input lines use the same standard
Adjust the trigger level
width value of the start and stop channels.
Verification point
and||the number of measurements
1V, adjust the time
trigger slope division
function setting
and the interval measuring instrument
measure the pulse
pulse width
MEROLOGY PUE
Output amplitude
Tested time interval
Time interval measuring instrument
Figure 3 Delay time measurement
Generator
The tested time interval generator is set to internal trigger, output polarity is set to "ten", function is set to "delay time output", and output amplitude is 1V.
JJG723-—2008
The function of the time interval measuring instrument is set to "time interval measurement". Adjust the trigger levels of the start and stop channels to 50% and 0.5V of the synchronization pulse amplitude respectively, set the trigger slope to "ten", and measure the delay time value. Calibration points and number of measurements The selection is the same as in 6.3.1.
The output polarity of the time interval generator to be tested is set to "1", the output amplitude is -1V, and the trigger levels of the start and stop channels of the time interval measuring instrument are adjusted to 50% of the synchronization pulse amplitude and -0.5V respectively. The trigger slope is set according to the polarity and the delay time value is measured. The selection of the calibration point and the number of measurements is the same as in 6.3.1. The error of the delay time
is calculated according to formula (1). 6.3.5 Calibration of the time interval between two single pulses (step voltage) The time interval generator to be tested can output a single channel. The connection of the combined version of the double sand instrument is shown in Figure 2: The two pulses of the time interval generator to be tested
consist of two When the output is different, the instrument is connected as shown in Figure 4. HOU
reference frequency
tested time
time port interval
tested time interval
generator
pulse 1
pulse 2
Figure 4 Measurement of two single pulse time intervals
"Ten", the function is set to "double pulse output" interval generator output polarity set
time interval measurement instrument function setting
both are 0.5V
fixed point and measurement
slope are both set to "
" and the selection is the same as in 6.3.1
"Time interval measurement: Output two single pulses. The output polarity of the time interval generator to be tested is set to start and stop. The trigger levels of both channels are the time interval value. Adjust the start and stop (step voltage) output amplitudes to -1V and 5V. The trigger slopes are set to the same 6 elements. Select the fixed points and the number of measurements. Calculate the error of the time interval between the two single pulses according to formula (1). The instrument connection is as shown in the figure. The time interval error of the pulse rise and fall time is calculated. The output amplitude is 1V. The trigger level of the channel is the time interval value. The time interval measuring instrument can produce the time interval between two single pulses. The measured time interval is shown in Figure 5. The measurement of pulse rise time and fall time. The output polarity of the measured time interval generator is set to "+", the function is set to "pulse width output", the output amplitude is 1V, and the output pulse width is the minimum output value. The oscilloscope is matched with the time interval generator and connected. The oscilloscope is adjusted to obtain a stable pulse waveform with an amplitude of about 80% of the effective height of the screen on the screen. The time interval corresponding to the pulse amplitude rising from 10% to 90% is the pulse rise time, and the time interval corresponding to the pulse amplitude falling from 90% to 10% is the pulse fall time. 5
6.3.7 Pulse amplitude verification
The instrument connection is shown in Figure 5.
JJG723—2008
The output polarity of the time interval generator under test is set to "+", the function is set to "pulse width output", the output amplitude is minimum, and the output pulse width is 1ms.
The oscilloscope is matched with the time interval generator and connected. The oscilloscope is adjusted to obtain a stable pulse waveform with an amplitude of more than 50% of the effective height of the screen on the screen. Measure the amplitude value U. of the pulse waveform. Change the output amplitude U. of the time interval generator under test to 1V, 3V, 5V, 8V, and 10V in sequence, and repeat the above measurement.
The output pulse amplitude error is calculated according to formula (2): 8=(U.-U)/U,X100%
Where: pulse amplitude error;
U. Actual value of pulse amplitude;
U. Nominal value of pulse amplitude.
Note: When the pulse output amplitude of the time interval generator under test is a fixed value, the calibration is only performed at the fixed output amplitude value. 6.4 Handling of verification results
According to the provisions and requirements of this regulation, a verification certificate shall be issued for time interval generators that pass the verification items; if the verification fails, a verification result notice shall be issued, indicating the failed items. 6.5 Verification cycle
The verification cycle of the time interval generator is 1 year. 6
Appendix A
JJG723-2008
Verification certificate (inner page) format
A.1Verification certificate (inner page) format
1.Verification of crystal oscillator inside the machine
Power-on characteristics
Daily frequency fluctuation
Daily aging rate
1s frequency stability
Frequency reproducibility
Frequency accuracy
2.Verification of continuous pulse period
Nominal value of period
Measured value||tt ||Test results
3.Test of continuous pulse width
Nominal value
Pulse amplitude: +1V
Measured value
Single pulse width
Nominal value
JJG723—2008
Measured value
Pulse amplitude: -1V
ONHSTHAN
Pulse amplitude: +1V
Pulse amplitude:
PUBLISHING
MIETROLOGY2 Negative pulse
generator output polarity set
time interval to be tested
start and stop channel
width value. Verification point
calculated according to (1)
generator level is 10
temperature measurement times are selected in the same way 6
continuous pulse error
6.3.3 single pulse width
given
instrument connection as shown
time interval to be tested generator output polarity set
to 1V.
According to the method of 6.3.2.1, 6.3.4 Delay time verification. The instrument connection is shown in Figure 3.
Reference frequency standard
", measuring pulse
Tested time interval
Generator
Pulse output
When the two input lines use the same standard
Adjust the trigger level
width value of the start and stop channels.
Verification point
and||the number of measurements
1V, adjust the time
trigger slope division
function setting
and the interval measuring instrument
measure the pulse
pulse width
MEROLOGY PUE
Output amplitude
Tested time interval
Time interval measuring instrument
Figure 3 Delay time measurement
Generator
The tested time interval generator is set to internal trigger, output polarity is set to "ten", function is set to "delay time output", and output amplitude is 1V.
JJG723-—2008
The function of the time interval measuring instrument is set to "time interval measurement". Adjust the trigger levels of the start and stop channels to 50% and 0.5V of the synchronization pulse amplitude respectively, set the trigger slope to "ten", and measure the delay time value. Calibration points and number of measurements The selection is the same as in 6.3.1.
The output polarity of the time interval generator to be tested is set to "1", the output amplitude is -1V, and the trigger levels of the start and stop channels of the time interval measuring instrument are adjusted to 50% of the synchronization pulse amplitude and -0.5V respectively. The trigger slope is set according to the polarity and the delay time value is measured. The selection of the calibration point and the number of measurements is the same as in 6.3.1. The error of the delay time
is calculated according to formula (1). 6.3.5 Calibration of the time interval between two single pulses (step voltage) The time interval generator to be tested can output a single channel. The connection of the combined version of the double sand instrument is shown in Figure 2: The two pulses of the time interval generator to be tested
consist of two When the output is different, the instrument is connected as shown in Figure 4. HOU
reference frequency
tested time
time port interval
tested time interval
generator
pulse 1
pulse 2
Figure 4 Measurement of two single pulse time intervals
"Ten", the function is set to "double pulse output" interval generator output polarity set
time interval measurement instrument function setting
both are 0.5V
fixed point and measurement
slope are both set to "
" and the selection is the same as in 6.3.1
"Time interval measurement: Output two single pulses. The output polarity of the time interval generator to be tested is set to start and stop. The trigger levels of both channels are the time interval value. Adjust the start and stop (step voltage) output amplitudes to -1V and 5V. The trigger slopes are set to the same 6 elements. Select the fixed points and the number of measurements. Calculate the error of the time interval between the two single pulses according to formula (1). The instrument connection is as shown in the figure. The time interval error of the pulse rise and fall time is calculated. The output amplitude is 1V. The trigger level of the channel is the time interval value. The time interval measuring instrument can produce the time interval between two single pulses. The measured time interval is shown in Figure 5. The measurement of pulse rise time and fall time. The output polarity of the measured time interval generator is set to "+", the function is set to "pulse width output", the output amplitude is 1V, and the output pulse width is the minimum output value. The oscilloscope is matched with the time interval generator and connected. The oscilloscope is adjusted to obtain a stable pulse waveform with an amplitude of about 80% of the effective height of the screen on the screen. The time interval corresponding to the pulse amplitude rising from 10% to 90% is the pulse rise time, and the time interval corresponding to the pulse amplitude falling from 90% to 10% is the pulse fall time. 5
6.3.7 Pulse amplitude verification
The instrument connection is shown in Figure 5.
JJG723—2008
The output polarity of the time interval generator under test is set to "+", the function is set to "pulse width output", the output amplitude is minimum, and the output pulse width is 1ms.
The oscilloscope is matched with the time interval generator and connected. The oscilloscope is adjusted to obtain a stable pulse waveform with an amplitude of more than 50% of the effective height of the screen on the screen. Measure the amplitude value U. of the pulse waveform. Change the output amplitude U. of the time interval generator under test to 1V, 3V, 5V, 8V, and 10V in sequence, and repeat the above measurement.
The output pulse amplitude error is calculated according to formula (2): 8=(U.-U)/U,X100%
Where: pulse amplitude error;
U. Actual value of pulse amplitude;
U. Nominal value of pulse amplitude.
Note: When the pulse output amplitude of the time interval generator under test is a fixed value, the calibration is only performed at the fixed output amplitude value. 6.4 Handling of verification results
According to the provisions and requirements of this regulation, a verification certificate shall be issued for time interval generators that pass the verification items; if the verification fails, a verification result notice shall be issued, indicating the failed items. 6.5 Verification cycle
The verification cycle of the time interval generator is 1 year. 6
Appendix A
JJG723-2008
Verification certificate (inner page) format
A.1Verification certificate (inner page) format
1.Verification of crystal oscillator inside the machine
Power-on characteristics
Daily frequency fluctuation
Daily aging rate
1s frequency stability
Frequency reproducibility
Frequency accuracy
2.Verification of continuous pulse period
Nominal value of period
Measured value||tt ||Test results
3.Test of continuous pulse width
Nominal value
Pulse amplitude: +1V
Measured value
Single pulse width
Nominal value
JJG723—2008
Measured value
Pulse amplitude: -1V
ONHSTHAN
Pulse amplitude: +1V
Pulse amplitude:
PUBLISHING
MIETROLOGY2 Negative pulse
generator output polarity set
time interval to be tested
start and stop channel
width value. Verification point
calculated according to (1)
generator level is 10
temperature measurement times are selected in the same way 6
continuous pulse error
6.3.3 single pulse width
given
instrument connection as shown
time interval to be tested generator output polarity set
to 1V.
According to the method of 6.3.2.1, 6.3.4 Delay time verification. The instrument connection is shown in Figure 3.
Reference frequency standard
", measuring pulse
Tested time interval
Generator
Pulse output
When the two input lines use the same standard
Adjust the trigger level
width value of the start and stop channels.
Verification point
and||the number of measurements
1V, adjust the time
trigger slope division
function setting
and the interval measuring instrument
measure the pulse
pulse width
MEROLOGY PUE
Output amplitude
Tested time interval
Time interval measuring instrument
Figure 3 Delay time measurement
Generator
The tested time interval generator is set to internal trigger, output polarity is set to "ten", function is set to "delay time output", and output amplitude is 1V.
JJG723-—2008
The function of the time interval measuring instrument is set to "time interval measurement". Adjust the trigger levels of the start and stop channels to 50% and 0.5V of the synchronization pulse amplitude respectively, set the trigger slope to "ten", and measure the delay time value. Calibration points and number of measurements The selection is the same as in 6.3.1.
The output polarity of the time interval generator to be tested is set to "1", the output amplitude is -1V, and the trigger levels of the start and stop channels of the time interval measuring instrument are adjusted to 50% of the synchronization pulse amplitude and -0.5V respectively. The trigger slope is set according to the polarity and the delay time value is measured. The selection of the calibration point and the number of measurements is the same as in 6.3.1. The error of the delay time
is calculated according to formula (1). 6.3.5 Calibration of the time interval between two single pulses (step voltage) The time interval generator to be tested can output a single channel. The connection of the combined version of the double sand instrument is shown in Figure 2: The two pulses of the time interval generator to be tested
consist of two When the output is different, the instrument is connected as shown in Figure 4. HOU
reference frequency
tested time
time port interval
tested time interval
generator
pulse 1
pulse 2
Figure 4 Measurement of two single pulse time intervals
"Ten", the function is set to "double pulse output" interval generator output polarity set
time interval measurement instrument function setting
both are 0.5V
fixed point and measurement
slope are both set to "
" and the selection is the same as in 6.3.1
"Time interval measurement: Output two single pulses. The output polarity of the time interval generator to be tested is set to start and stop. The trigger levels of both channels are the time interval value. Adjust the start and stop (step voltage) output amplitudes to -1V and 5V. The trigger slopes are set to the same 6 elements. Select the fixed points and the number of measurements. Calculate the error of the time interval between the two single pulses according to formula (1). The instrument connection is as shown in the figure. The time interval error of the pulse rise and fall time is calculated. The output amplitude is 1V. The trigger level of the channel is the time interval value. The time interval measuring instrument can produce the time interval between two single pulses. The measured time interval is shown in Figure 5. The measurement of pulse rise time and fall time. The output polarity of the measured time interval generator is set to "+", the function is set to "pulse width output", the output amplitude is 1V, and the output pulse width is the minimum output value. The oscilloscope is matched with the time interval generator and connected. The oscilloscope is adjusted to obtain a stable pulse waveform with an amplitude of about 80% of the effective height of the screen on the screen. The time interval corresponding to the pulse amplitude rising from 10% to 90% is the pulse rise time, and the time interval corresponding to the pulse amplitude falling from 90% to 10% is the pulse fall time. 5
6.3.7 Pulse amplitude verification
The instrument connection is shown in Figure 5.
JJG723—2008
The output polarity of the time interval generator under test is set to "+", the function is set to "pulse width output", the output amplitude is minimum, and the output pulse width is 1ms.
The oscilloscope is matched with the time interval generator and connected. The oscilloscope is adjusted to obtain a stable pulse waveform with an amplitude of more than 50% of the effective height of the screen on the screen. Measure the amplitude value U. of the pulse waveform. Change the output amplitude U. of the time interval generator under test to 1V, 3V, 5V, 8V, and 10V in sequence, and repeat the above measurement.
The output pulse amplitude error is calculated according to formula (2): 8=(U.-U)/U,X100%
Where: pulse amplitude error;
U. Actual value of pulse amplitude;
U. Nominal value of pulse amplitude.
Note: When the pulse output amplitude of the time interval generator under test is a fixed value, the calibration is only performed at the fixed output amplitude value. 6.4 Handling of verification results
According to the provisions and requirements of this regulation, a verification certificate shall be issued for time interval generators that pass the verification items; if the verification fails, a verification result notice shall be issued, indicating the failed items. 6.5 Verification cycle
The verification cycle of the time interval generator is 1 year. 6
Appendix A
JJG723-2008
Verification certificate (inner page) format
A.1Verification certificate (inner page) format
1.Verification of crystal oscillator inside the machine
Power-on characteristics
Daily frequency fluctuation
Daily aging rate
1s frequency stability
Frequency reproducibility
Frequency accuracy
2.Verification of continuous pulse period
Nominal value of period
Measured value||tt ||Test results
3.Test of continuous pulse width
Nominal value
Pulse amplitude: +1V
Measured value
Single pulse width
Nominal value
JJG723—2008
Measured value
Pulse amplitude: -1V
ONHSTHAN
Pulse amplitude: +1V
Pulse amplitude:
PUBLISHING
MIETROLOGY1.
The output polarity of the time interval generator to be tested is set to "1", the output amplitude is -1V, the trigger level of the start and stop channels of the time interval measuring instrument is adjusted to 50% of the synchronous pulse amplitude and -0.5V respectively, the trigger slope is set according to the polarity, and the delay time value is measured. The selection of the calibration point and the number of measurements is the same as that of 6.3.1. According to formula (1), the error of the delay time is calculated
6.3.5 The calibration of the time interval between two single pulses (step voltage) The time interval generator to be tested can be single-channel output and the instrument connection is shown in Figure 2: When the two pulses of the time interval generator to be tested are output by two channels, the instrument connection is shown in Figure 4. HOU
reference frequency
tested time
time interval
tested time interval
generator
pulse 1
pulse 2
Figure 4 Measurement of two single pulse time intervals
"Ten", the function is set to "dual pulse output", the output polarity of the interval generator is set to
, the time measurement function of the measuring instrument is set to
both are 0.5V
fixed point and measurement
slope are both set to "
". The selection is the same as 6.3.1
"Time Interval Measurement
output two single pulses
tested time question, the output polarity of the interval generator is set to the trigger level for starting and stopping the operation is the time interval value.
Adjust the start and stop
(step voltage)
output amplitude is -1V,
5V. The trigger slope is set to 1V.
Select the same 6 elements
fixed points and measurement times
Calculate the error of the time interval between two single pulses
pulse rise
instrument connection as shown in the figure
fall time verification
output amplitude is 1V.
Channel trigger level
time interval value. The time interval measuring instrument can produce the time interval between two single pulses. The measured time interval is shown in Figure 5. The measurement of pulse rise time and fall time. The output polarity of the measured time interval generator is set to "+", the function is set to "pulse width output", the output amplitude is 1V, and the output pulse width is the minimum output value. The oscilloscope is matched with the time interval generator and connected. The oscilloscope is adjusted to obtain a stable pulse waveform with an amplitude of about 80% of the effective height of the screen on the screen. The time interval corresponding to the pulse amplitude rising from 10% to 90% is the pulse rise time, and the time interval corresponding to the pulse amplitude falling from 90% to 10% is the pulse fall time. 5
6.3.7 Pulse amplitude verification
The instrument connection is shown in Figure 5.
JJG723—2008
The output polarity of the time interval generator under test is set to "+", the function is set to "pulse width output", the output amplitude is minimum, and the output pulse width is 1ms.
The oscilloscope is matched with the time interval generator and connected. The oscilloscope is adjusted to obtain a stable pulse waveform with an amplitude of more than 50% of the effective height of the screen on the screen. Measure the amplitude value U. of the pulse waveform. Change the output amplitude U. of the time interval generator under test to 1V, 3V, 5V, 8V, and 10V in sequence, and repeat the above measurement.
The output pulse amplitude error is calculated according to formula (2): 8=(U.-U)/U,X100%
Where: pulse amplitude error;
U. Actual value of pulse amplitude;
U. Nominal value of pulse amplitude.
Note: When the pulse output amplitude of the time interval generator under test is a fixed value, the calibration is only performed at the fixed output amplitude value. 6.4 Handling of verification results
According to the provisions and requirements of this regulation, a verification certificate shall be issued for time interval generators that pass the verification items; if the verification fails, a verification result notice shall be issued, indicating the failed items. 6.5 Verification cycle
The verification cycle of the time interval generator is 1 year. 6
Appendix A
JJG723-2008
Verification certificate (inner page) format
A.1Verification certificate (inner page) format
1.Verification of crystal oscillator inside the machine
Power-on characteristics
Daily frequency fluctuation
Daily aging rate
1s frequency stability
Frequency reproducibility
Frequency accuracy
2.Verification of continuous pulse period
Nominal value of period
Measured value||tt ||Test results
3.Test of continuous pulse width
Nominal value
Pulse amplitude: +1V
Measured value
Single pulse width
Nominal value
JJG723—2008
Measured value
Pulse amplitude: -1V
ONHSTHAN
Pulse amplitude: +1V
Pulse amplitude:
PUBLISHING
MIETROLOGY1.
The output polarity of the time interval generator to be tested is set to "1", the output amplitude is -1V, the trigger level of the start and stop channels of the time interval measuring instrument is adjusted to 50% of the synchronous pulse amplitude and -0.5V respectively, the trigger slope is set according to the polarity, and the delay time value is measured. The selection of the calibration point and the number of measurements is the same as that of 6.3.1. According to formula (1), the error of the delay time is calculated
6.3.5 The calibration of the time interval between two single pulses (step voltage) The time interval generator to be tested can be single-channel output and the instrument connection is shown in Figure 2: When the two pulses of the time interval generator to be tested are output by two channels, the instrument connection is shown in Figure 4. HOU
reference frequency
tested time
time interval
tested time interval
generator
pulse 1
pulse 2
Figure 4 Measurement of two single pulse time intervals
"Ten", the function is set to "dual pulse output", the output polarity of the interval generator is set to
, the time measurement function of the measuring instrument is set to
both are 0.5V
fixed point and measurement
slope are both set to "
". The selection is the same as 6.3.1
"Time Interval Measurement
output two single pulses
tested time question, the output polarity of the interval generator is set to the trigger level for starting and stopping the operation is the time interval value.
Adjust the start and stop
(step voltage)
output amplitude is -1V,
5V. The trigger slope is set to 1V.
Select the same 6 elements
fixed points and measurement times
Calculate the error of the time interval between two single pulses
pulse rise
instrument connection as shown in the figure
fall time verification
output amplitude is 1V.
Channel trigger level
time interval value. The time interval measuring instrument can produce the time interval between two single pulses. The measured time interval is shown in Figure 5. The measurement of pulse rise time and fall time. The output polarity of the measured time interval generator is set to "+", the function is set to "pulse width output", the output amplitude is 1V, and the output pulse width is the minimum output value. The oscilloscope is matched with the time interval generator and connected. The oscilloscope is adjusted to obtain a stable pulse waveform with an amplitude of about 80% of the effective height of the screen on the screen. The time interval corresponding to the pulse amplitude rising from 10% to 90% is the pulse rise time, and the time interval corresponding to the pulse amplitude falling from 90% to 10% is the pulse fall time. 5
6.3.7 Pulse amplitude verification
The instrument connection is shown in Figure 5.
JJG723—2008
The output polarity of the time interval generator under test is set to "+", the function is set to "pulse width output", the output amplitude is minimum, and the output pulse width is 1ms.
The oscilloscope is matched with the time interval generator and connected. The oscilloscope is adjusted to obtain a stable pulse waveform with an amplitude of more than 50% of the effective height of the screen on the screen. Measure the amplitude value U. of the pulse waveform. Change the output amplitude U. of the time interval generator under test to 1V, 3V, 5V, 8V, and 10V in sequence, and repeat the above measurement.
The output pulse amplitude error is calculated according to formula (2): 8=(U.-U)/U,X100%
Where: pulse amplitude error;
U. Actual value of pulse amplitude;
U. Nominal value of pulse amplitude.
Note: When the pulse output amplitude of the time interval generator under test is a fixed value, the calibration is only performed at the fixed output amplitude value. 6.4 Handling of verification results
According to the provisions and requirements of this regulation, a verification certificate shall be issued for time interval generators that pass the verification items; if the verification fails, a verification result notice shall be issued, indicating the failed items. 6.5 Verification cycle
The verification cycle of the time interval generator is 1 year. 6
Appendix A
JJG723-2008
Verification certificate (inner page) format
A.1Verification certificate (inner page) format
1.Verification of crystal oscillator inside the machine
Power-on characteristics
Daily frequency fluctuation
Daily aging rate
1s frequency stability
Frequency reproducibility
Frequency accuracy
2.Verification of continuous pulse period
Nominal value of period
Measured value||tt ||Test results
3.Test of continuous pulse width
Nominal value
Pulse amplitude: +1Vwww.bzxz.net
Measured value
Single pulse width
Nominal value
JJG723—2008
Measured value
Pulse amplitude: -1V
ONHSTHAN
Pulse amplitude: +1V
Pulse amplitude:
PUBLISHING
MIETROLOGY4 Handling of verification results
According to the provisions and requirements of this regulation, a verification certificate shall be issued for time interval generators that pass the verification items; if the verification fails, a verification result notice shall be issued, indicating the failed items. 6.5 Verification cycle
The verification cycle of the time interval generator is 1 year. 6
Appendix A
JJG723-2008
Verification certificate (inner page) format
A.1Verification certificate (inner page) format
1.Verification of crystal oscillator inside the machine
Power-on characteristics
Daily frequency fluctuation
Daily aging rate
1s frequency stability
Frequency reproducibility
Frequency accuracy
2.Verification of continuous pulse period
Nominal value of period
Measured value||tt ||Test results
3.Test of continuous pulse width
Nominal value
Pulse amplitude: +1V
Measured value
Single pulse width
Nominal value
JJG723—2008
Measured value
Pulse amplitude: -1V
ONHSTHAN
Pulse amplitude: +1V
Pulse amplitude:
PUBLISHING
MIETROLOGY4 Handling of verification results
According to the provisions and requirements of this regulation, a verification certificate shall be issued for time interval generators that pass the verification items; if the verification fails, a verification result notice shall be issued, indicating the failed items. 6.5 Verification cycle
The verification cycle of the time interval generator is 1 year. 6
Appendix A
JJG723-2008
Verification certificate (inner page) format
A.1Verification certificate (inner page) format
1.Verification of crystal oscillator inside the machine
Power-on characteristics
Daily frequency fluctuation
Daily aging rate
1s frequency stability
Frequency reproducibility
Frequency accuracy
2.Verification of continuous pulse period
Nominal value of period
Measured value||tt ||Test results
3.Test of continuous pulse width
Nominal value
Pulse amplitude: +1V
Measured value
Single pulse width
Nominal value
JJG723—2008
Measured value
Pulse amplitude: -1V
ONHSTHAN
Pulse amplitude: +1V
Pulse amplitude:
PUBLISHING
MIETROLOGY
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