Some standard content:
Verification Reubation of Net Pyrradlameter JJG 925-1997 Net Pyrradiometer Issued on October 24, 1997 and implemented on May 1, 1998 Issued by the State Bureau of Technical Supervision Verification Reubation of Net Pyrradlameter JJG 925-1997 This verification procedure was approved by the State Bureau of Technical Supervision on October 24, 1997, and came into effect on May 1, 1998.
Responsible unit:
Drafting unit:
China Meteorological Metrology and Verification Institute
National Meteorological Metrology Station
The drafting unit is responsible for interpreting the technical provisions of this regulation. The main drafters of this regulation:
Mo Yueqin
Gong Bingzhong
JJG 925 —1997
(National Meteorological Station)
(National Meteorological Station)
(National Meteorological Station)
Technical requirements
(I) Appearance
(II) Performance parameters
Verification conditions
Verification items and verification methods
(I) Appearance inspection
(II) Measurement and verification of performance parameters
IV. Processing of verification results and verification period
Appendix I Determination of leakage error
Appendix 2 Verification certificate (back) Qualification test
JJG925
.JJG 925 -1997
Calibration Procedure for Pyrheometer
This procedure is applicable to the calibration of working-level hot-type pyrheometers (hereinafter referred to as pyrheometers) that are newly manufactured, in use and after treatment.
I Technical Requirements
（-）Appearance
1 The sensing surface is flat, the coating is uniform, solid, non-reflective, without spots, cracks, shedding and foreign matter adhesion. The sensing surface should be flush with the optical surface, and the gap should be appropriate. 3 The thickness of the polyvinyl film cover should be uniform, without obvious spots, scratches and other obvious defects. The film cover should be hemispherical, well-sealed, and easy to replace. There should be no condensation on the inner surface of the cover. The inflatable package should be elastic and crack-free, easy to use, effective, and
4 The metal ring and rubber bottom should be used to press the polyethylene film cover, and there should be no water leakage. 5 The fixation of the dryer should be firm and sealed for easy replacement. The instrument hood (protection) should be moderately tight and easy to open. 6
The instrument should have obvious upper and lower markings.
The instrument lead wire should have fixed positive and negative markings (based on daytime) 9 The plane of the level should be parallel to the sensing surface, and the horizontal adjustment should be flexible and convenient. 10
The instrument should have a permanent nameplate with clear characters. The protective layer on the surface of the instrument should be even and solid, and there should be no defects such as shedding and rust: 11
【-Performance parameters
12 The insulation resistance between the thermoelectric and the instrument body>110. 13
Internal resistance 800
Allowable sensitivity range
Newly manufactured: 7~14uVW·1.㎡;
In use and after repair: 6~15gVW-1m2 The difference between the full sensitivity and the long sensitivity is 15%. 15
16 Response time (99% response) <60
17 Non-linear error <5%,
18 Cosine response error
Sun angle 10 (deviation from theoretical value) <15%. 19
Square response error
Sun altitude 10 (deviation from average value) <10%: 20
Temperature error (-20～+40℃ range) <5% 2. Verification conditions
21 Standard instrument and verification equipment
21.1 Standard pyranometer:
JJy25199
21.20.05 Digital multimeter or data acquisition device with a resolution of 14V. 21.3 Megohmmeter with voltage of 100V
21.4 Stopwatch, wind speed.
21.5 Indoor test equipment for radiometers,
22 Setting environmental conditions
22.1 When measuring single insulation resistance, the relative humidity should be <80%. 22.2 The sensitivity test should be carried out under natural radiation conditions: 22.2, clear air, solar altitude angle of 30°, open space around, and no obvious obstacles to the instrument sensing. 22.2.2 Air temperature (20±10)°C, wind speed <31mV5: relative humidity <% 22.3 Laboratory environment
2, 3.1 The internal control equipment should be installed in a dark room and covered with a black curtain. The inspector should wear dark work clothes. 2.3.2 Room loss (20+10)7, relative humidity <80%. Three inspection items and inspection methods
(i) Appearance age inspection
23 The inspections of Articles 1 to 11 are applicable and are carried out in combination with manual adjustment. (ii) Performance parameter measurement and inspection
The clean and qualified vehicles that have passed the appearance inspection are subject to performance parameter measurement and inspection. 24 Insulation resistance measurement
The megohmmeter is used to measure the output terminals of the radiation meter and the local parts of the meter body respectively. The measured resistance is the insulation resistance.
25. Measurement of light leakage of the instrument. Use digital color meter to measure. When measuring, the polarity should be reversed. 1 item or its average value shall be the final measurement result (rounded to one decimal place): 26. Verification of sensitivity
26.1 Verification of sensitivity
26.1.1 Micro-equipment work
26.1.1.1 Place the standard instrument and the instrument to be tested on the platform in the room with the induction head facing south. Place the measuring meter in an open space indoors and avoid direct sunlight. 26.1.1.2 After the standard instrument and the instrument under test are exposed to light, they are connected to the measuring instrument and the polarity, signal size and stability of the instrument output value are checked. 26.1.1.3 All necessary membranes are filled with air, adjusted to the level, and placed in the test environment for more than 11 (about 1.5 hours or 1.4 hours). Data collection can be carried out. 26.1.2 Data collection
For the retrograde synchronous measurement of the standard instrument and the instrument under test, the measuring time can be 1 to 3 minutes, and the measuring time is 3 to 4 hours (retrograde between 14 hours). Note the average value during the measurement. 26.1.3 Data processing
—L997
26.1.3.1 Based on the instantaneous values collected, calculate the ratio of each measurement according to the following formula (rounded to three decimal places):
Where: V)-the th output value of the instrument under test: Vo,)-the th output value of the standard instrument 26.1.3.2 Taking 20 valid data as the basis, calculate the average characteristic F of the group ratio according to the following formula: F,-t includes.
Where; n-the number of measurements in a group
26.1 .3.3 Data deletion
Calculate the standard sieve error of the group test according to the following formula: (EG)E)
SENR-iA
If the difference between F(. and F>3, the valid data should be deleted, the number of measurements should be reduced accordingly, and F should be recalculated after the data is divided:
26.1.3.4 For a test series with m groups, calculate the ratio Fr=12r according to the following formula
26.1.3.5 The sensitivity of the instrument under test is calculated according to the following formula: K - p+ F
Where: The sensitivity of the standard net umbrella radiation meter. K (unit: VW-1-) The calculated value is rounded to two decimal places. 25.2 Long-wave sensitivity test
This test is carried out 2 hours after the printing, and the preparations, data collection and data processing are the same as the full-wave sensitivity test. 27. The test of the time
Newly built full-wave radiation meter, this test is not carried out during the re-test. 27.1 Place the net full-wave radiation meter on the outdoor platform. On the workbench of the instrument verification equipment, connect the light to the electric meter. Remove the instrument cover, wait 2 minutes, then cover the cover, read the zero value 27.2 after 2 minutes, and then calculate the response time function of the measuring point position by the following formula: measuring point position = inverse instrument value, zero value 100
23 seconds, stop the stopwatch, and write down the time of the meter, which is the measuring point position
27.4 recovery rate 27.1-27.3 Perform each operation 3 times, and take the average as the measurement result of the response time. 28 Visual determination of nonlinear error
When a new radiometer is calibrated in the factory, this measurement should be carried out: The measurement is carried out on the calibration equipment 1 in the case
JJG 925 —1997
28.1 Preheat the solar simulator, fix the lower sensing surface of the measuring instrument with the hemispherical cavity and place it on the upper working table, so that the sensing surface of the instrument is perpendicular to the incident light. The monitoring instrument (direct radiometer) is aligned with the spot angle and the light spot is aligned. 28.2 Adjust the power of the solar simulator so that the irradiance is 250W/m2, 500W/m2, 750W/m2 and 1000W/m2 respectively. 28.3 Each time it is adjusted to a certain irradiance, stabilize it by 15mm, and then continuously sample 10 times at a rate of 10~151 times. During the measurement, the fan should continuously supply air to the meter body. 28.4 Calculate the nonlinear error according to the following formula:
1-1×10%
Where: R is the ratio of the measured instrument data at the first measuring point to the average value of the monitoring instrument data; R is the average value of R at all measuring points.
29 Determination of residual response error and azimuth response error This measurement should be carried out for newly manufactured and repaired net total pyranometers. The measurement is carried out on the indoor test equipment.
29.1 Measurement method
29.1.1 Adjust the power of the solar simulator so that the irradiance is above 500W/m and measure it for 1h. Fix the lower sensing surface of the measured instrument to the hemispherical cavity and place it on the workbench so that the instrument is facing the rotating arm of the test equipment. At this time, the rotation angle should be at 90 (angle = 0). Adjust the instrument level and connect it to the electrical measuring instrument. During the measurement, the fan should continuously supply air to the meter body.
29.1.2 After 10 minutes of exposure, continuously sample 10 times at a rate of 10-15g/time (the readings of the following measuring points are the same).
29.1.3 Rotate the arm, 9=80° (equivalent to the solar altitude angle 10, 9=0° (film position angle 0\), and adjust the instrument level, and read the readings after 10 minutes.
29.1.4 Keep the position of the arm fixed, rotate the workbench to the corresponding position (in order of 30°, 60°, 120°, 150° and 180°), and after 5 minutes of exposure, read the data of the corresponding positions respectively. 29.1.5 Rotate the arm to work Make a table, make 0=0\, 9=0°, and adjust the instrument horizontally, and read the value after 10 minutes. 29.2 Cosine response error is calculated as follows: =
Where: V is the average value of 10 readings at 80\; x100%
is 0s80 (V is the average value of the two groups of data when =0°). 29.3 Azimuth response error is calculated as follows: a=
Where: V is the average value of 10 readings at each position point - all directions The average value at the site.
30 Determination of the error of the lake
×100%
Newly manufactured net total grating meters must be sampled for this measurement. The determination method is shown in Appendix 1. 31 Calculation of the sensitivity change rate
Calculate the sensitivity change rate according to the following formula:
JJG925
Where K is the sensitivity of the previous test;
is the sensitivity of the new test.
×100%
IV. Processing of verification results and verification cycle
32 A verification certificate will be issued to the net total pyrradiometer that has passed the verification. The format of the verification certificate is shown in Appendix 2. 33 A verification result notice will be issued to the net total pyrradiometer that has failed the verification. 34 The verification cycle is 2 years. The net total pyrradiometer that has been processed must be re-calibrated. (10)
Appendix 1
1 Equipment
1.1 Temperature control box for data radiation instrument
JJG 925 ——1997
Determination of temperature error
Temperature range: -20.0-+40.0
Humidity control accuracy: ±0.5℃
Uniformity of temperature field: +/-0.5℃
1.2 Instrument calibration equipment (or equipment with the same power): 1.3 Digital multimeter or data collector with level 0.05 and resolution 1, 1.4 Monitoring meter.
2 Measurement conditions
2.1 The workpiece to be measured should be in a dark room: dark working clothes should be used for calibration, 2.2 The auxiliary illumination of the instrument sensing surface should be >00℃/, 2.3 Control The temperature box should be kept dry. No moisture or condensation should appear on the test area and the glass of the light selection port in the whole temperature measurement range.
2.1 The support surface of the built-in moisture control box is made of non-toxic material. The position of the support will not change with the change of temperature. 3 Measurement method
3.1 The measurement temperature is within the range of -20-+40℃. The measurement points are -20%, 0℃: +20℃, +40%℃. 3.2 Fix the lower sensing surface of the instrument under test and the hemispherical cavity and place them in the temperature control box so that the center of the sensing surface of the instrument coincides with the center of the light entrance window.
3.3 Place the monitoring instrument at the corner of the light spot outside the control box and fix it. 3.4 Adjust the temperature in the box to -21%. When the preset temperature is reached, it should be stable for more than 1h. 3.5 Turn on the light source, so that the center of the light spot coincides with the center of the instrument sensing surface: cover the light-entry window with a light shield, wait for the light source to stabilize, open the light shield, and irradiate for 5 minutes. During the entire measurement process, the relative positions of all devices remain unchanged. 3.6 Cover the light-entry window and the monitor window, wait for the zero position to stabilize, and read the relative values of the measured instrument window and the monitoring window. 3.7 Turn on the light shield, stabilize for 5 minutes, and synchronously collect 10 readings of the measuring instrument and the monitoring instrument at a rate of 10 to 151 times.
3.8 Adjust the temperature to the next temperature point, and the measurement method is the same as the previous temperature point. The data manager calculates the temperature error by the following formula:
Wu:
The ratio of the readings of the measured instrument and the monitoring instrument after zero correction at the first temperature point: the distance between all temperature points:
Appendix 2
Full-wave sensitivity
(rate of change
Daytime calibration time
Nighttime calibration time
2 Internal value
3 Response time
4 Non-linear error
5 Temperature error
JG 925 —1997
Verification certificate (back) format
Verification results
, Temperature during calibration
Temperature during calibration
(99% sensitivity difference)
6 Cosine error 15 dong
(sun altitude angle is 10°)
Azimuth error
(deviation from the average value when the sun altitude angle is 10°) 15%
8 Difference in sensitivity between full wave and long wave4 Keep the arm still, rotate the workbench to the corresponding azimuth (in order: 30°, 60°, 120°, 150° and 180°), and read the data of the corresponding azimuths after 5 minutes of irradiation. 29.1.5 Rotate the arm workbench to make 0=0\, 9=0°, and adjust the level of the instrument. Read the data after 10 minutes. 29.2 The cosine response error is calculated as follows: =
Where: V——the average value of 10 readings at 80\; x100%
——0s80 (V is the average value of the two groups of data when =0°). 29.3 The azimuth response error is calculated as follows: a=
Where: V——the average value of 10 readings at each position point——the average value at all azimuth positions.
30 Determination of radiance error
×100%
Newly manufactured net total pyrradiometers must be tested in this way. The test method is shown in Appendix 1. 31 Calculation of sensitivity change rate
Calculate the sensitivity change rate according to the following formula:
JJG925
Where K is the sensitivity of the previous test;
is the sensitivity of the new test.
×100%
IV. Processing of test results and test cycle
32 A test certificate is issued to net total pyrradiometers that pass the test. The format of the test certificate is shown in Appendix 2. 33 A test result notice is issued to net total pyrradiometers that fail the test. 34 The test cycle is 2 years. The net total pyrradiometers that have been tested must be re-tested. (10)
Appendix 1
1 Equipment
1.1 Temperature control box for radiation instrument
JJG 925 ——1997
Determination of temperature error
Temperature range: -20.0-+40.0
Humidity control accuracy: ±0.5℃
Uniformity of temperature field: +/-0.5℃
1.2 Internal calibration equipment for radiation instrument (or equipment with the same capability): 1.3 Digital multimeter or data collector of level 0.05 and resolution 1, 1.4 Monitoring of direct radiation meter.
2 Measurement conditions
2.1 The workpiece to be measured shall be in a dark room: dark working clothes shall be worn. 2.2 The auxiliary illumination on the sensing surface of the instrument to be measured shall be >00°C/°C. 2.3 The temperature control box shall be kept dry. In the entire temperature measurement range, no dew or residue shall appear on the test area and the light selection window glass.
2.1 The support surface of the built-in dew in the control box shall be made of non-toxic material. The position of the support shall not change with the temperature. 3 Measurement method
3.1 The measurement temperature shall be within the range of -20-+40°C. The measuring points are -20%, 0°C: +20°C, +40%°C. 3.2 Fix the lower sensing surface of the instrument to be measured and the hemispherical cavity and place them in the temperature control box so that the center of the sensing surface of the instrument coincides with the center of the light inlet window.
3.3 Place the monitoring instrument at the corner of the light spot outside the control box and fix it. 3.4 Adjust the temperature in the box to -21%. When the preset temperature is reached, keep it stable for more than 1 hour. 3.5 Turn on the light source to make the center of the light spot coincide with the center of the instrument sensing surface: cover the light-entering window with a shading plate. After the light source is stable, open the shading plate and irradiate for 5 seconds. During the entire measurement process, the relative positions of all devices remain unchanged. 3.6 Cover the light-entering window and the monitoring instrument. After the zero position is stable, read the zero value of the measured instrument and the monitoring instrument. 3.7 Turn on the shading camera. After stabilization for 5 minutes, synchronously collect 10 readings of the trace measuring instrument and the monitoring instrument at a rate of 10 to 151 times.
3.8 Adjust the temperature to the next temperature point. The measuring method is the same as that of the previous temperature point. The data manager calculates the temperature error by the following formula:
Wu Zhong:
The ratio of the readings of the measured instrument and the monitoring instrument after zero correction at the first temperature point is: the distance between all temperature points: the scientific value.
Appendix 2
Full-wave sensitivity
(rate of change
Daytime calibration time
Nighttime calibration time
2 Internal value
3 Response time
4 Non-linear error
5 Temperature error
JG 925 —1997
Verification certificate (back) format
Verification results
, Temperature during calibration
Temperature during calibration
(99% sensitivity difference)
6 Cosine error 15 dong
(sun altitude angle is 10°)
Azimuth error
(deviation from the average value when the sun altitude angle is 10°) 15%
8 Difference in sensitivity between full wave and long wave4 Keep the arm still, rotate the workbench to the corresponding azimuth (in order: 30°, 60°, 120°, 150° and 180°), and read the data of the corresponding azimuths after 5 minutes of irradiation. 29.1.5 Rotate the arm workbench to make 0=0\, 9=0°, and adjust the level of the instrument. Read the data after 10 minutes. 29.2 The cosine response error is calculated as follows: =
Where: V——the average value of 10 readings at 80\; x100%
——0s80 (V is the average value of the two groups of data when =0°). 29.3 The azimuth response error is calculated as follows: a=
Where: V——the average value of 10 readings at each position point——the average value at all azimuth positions.
30 Determination of radiance error
×100%
Newly manufactured net total pyrradiometers must be tested in this way. The test method is shown in Appendix 1. 31 Calculation of sensitivity change rate
Calculate the sensitivity change rate according to the following formula:
JJG925
Where K is the sensitivity of the previous test;
is the sensitivity of the new test.
×100%
IV. Processing of test results and test cycle
32 A test certificate is issued to net total pyrradiometers that pass the test. The format of the test certificate is shown in Appendix 2. 33 A test result notice is issued to net total pyrradiometers that fail the test. 34 The test cycle is 2 years. The net total pyrradiometers that have been tested must be re-tested. (10)
Appendix 1
1 Equipment
1.1 Temperature control box for radiation instrument
JJG 925 ——1997
Determination of temperature error
Temperature range: -20.0-+40.0
Humidity control accuracy: ±0.5℃
Uniformity of temperature field: +/-0.5℃
1.2 Internal calibration equipment for radiation instrument (or equipment with the same capability): 1.3 Digital multimeter or data collector of level 0.05 and resolution 1, 1.4 Monitoring of direct radiation meter.
2 Measurement conditions
2.1 The workpiece to be measured shall be in a dark room: dark working clothes shall be worn. 2.2 The auxiliary illumination on the sensing surface of the instrument to be measured shall be >00°C/°C. 2.3 The temperature control box shall be kept dry. In the entire temperature measurement range, no dew or residue shall appear on the test area and the light selection window glass.
2.1 The support surface of the built-in dew in the control box shall be made of non-toxic material. The position of the support shall not change with the temperature. 3 Measurement method
3.1 The measurement temperature shall be within the range of -20-+40°C. The measuring points are -20%, 0°C: +20°C, +40%°C. 3.2 Fix the lower sensing surface of the instrument to be measured and the hemispherical cavity and place them in the temperature control box so that the center of the sensing surface of the instrument coincides with the center of the light inlet window.
3.3 Place the monitoring instrument at the corner of the light spot outside the control box and fix it. 3.4 Adjust the temperature in the box to -21%. When the preset temperature is reached, keep it stable for more than 1 hour. 3.5 Turn on the light source to make the center of the light spot coincide with the center of the instrument sensing surface: cover the light-entering window with a shading plate. After the light source is stable, open the shading plate and irradiate for 5 seconds. During the entire measurement process, the relative positions of all devices remain unchanged. 3.6 Cover the light-entering window and the monitoring instrument. After the zero position is stable, read the zero value of the measured instrument and the monitoring instrument. 3.7 Turn on the shading camera. After stabilization for 5 minutes, synchronously collect 10 readings of the trace measuring instrument and the monitoring instrument at a rate of 10 to 151 times.
3.8 Adjust the temperature to the next temperature point. The measuring method is the same as that of the previous temperature point. The data manager calculates the temperature error by the following formula:
Wu Zhong:
The ratio of the readings of the measured instrument and the monitoring instrument after zero correction at the first temperature point is: the distance between all temperature points: the scientific value.
Appendix 2
Full-wave sensitivity
(rate of change
Daytime calibration time
Nighttime calibration time
2 Internal value
3 Response time
4 Non-linear error
5 Temperature error
JG 925 —1997
Verification certificate (back) format
Verification results
, Temperature during calibration
Temperature during calibration
(99% sensitivity difference)
6 Cosine error 15 dong
(sun altitude angle is 10°)
Azimuth error
(deviation from the average value when the sun altitude angle is 10°) 15%
8 Difference in sensitivity between full wave and long waveData Manager
Calculate the temperature grinding error using the following formula:
Wu Zhong:
The ratio of the reading value of the instrument under test after zero correction to the average reading value of the monitoring instrument at the first temperature point: the distance between all temperature points: the scientific value.
Appendix 2
Full-wave sensitivity
(rate of change
Daytime calibration time
Nighttime calibration time
2 Internal value
3 Response time
4 Non-linear error
5 Temperature error
JG 925 —1997
Verification certificate (back) format
Verification results
, Temperature during calibration
Temperature during calibration
(99% sensitivity difference)
6 Cosine error 15 dong
(sun altitude angle is 10°)
Azimuth error
(deviation from the average value when the sun altitude angle is 10°) 15%
8 Difference in sensitivity between full wave and long waveData Manager
Calculate the temperature grinding error using the following formula:
Wu Zhong:
The ratio of the reading value of the instrument under test after zero correction to the average reading value of the monitoring instrument at the first temperature point: the distance between all temperature points: the scientific value.
Appendix 2
Full-wave sensitivity
(rate of change
Daytime calibration time
Nighttime calibration time
2 Internal valueWww.bzxZ.net
3 Response time
4 Non-linear error
5 Temperature error
JG 925 —1997
Verification certificate (back) format
Verification results
, Temperature during calibration
Temperature during calibration
(99% sensitivity difference)
6 Cosine error 15 dong
(sun altitude angle is 10°)
Azimuth error
(deviation from the average value when the sun altitude angle is 10°) 15%
8 Difference in sensitivity between full wave and long wave
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.