Some standard content:
National Metrology Verification Regulation of the People's Republic of China JJG855-1994
Digital Calorimetric Thermometer
Digital Calorimetric Thermometer1993-11-27
Implementation on 1994-06-01bzxZ.net
Promulgated by the State Bureau of Technical Supervision
JJG 8551994
Verification Regulation of
Digital Calorimetric ThermometerJJG 855-1994
This verification regulation was approved by the State Bureau of Technical Supervision on November 27, 1993, and came into effect on June 1, 1994.
Responsible unit: China Testing Technology Research Institute Drafting unit: Hebei Provincial Testing Research Institute The technical department of this regulation is responsible for the interpretation of this regulation. The main drafters:
Li Yujie
Dong Guofa
Li Zhenguo
Additional drafters:
Wang Dongpo
Geng Rongqin
JJG835--1994
(Hebei Provincial Measurement and Testing Research Institute)
(Hebei Provincial Metrology and Testing Research Institute)
(Hebei Province Metrology Inspection and Testing Institute)
(Hebei Province Testing Institute)
(Hebei Province Zhengyue Testing Institute)
Technical requirements
Verification conditions
Verification methods
Test results and verification period
Appendix 1
Appendix 2
Main terms and definitions
Precision DC resistance box composition method
Appendix 3 Format on the back of the verification certificate
Deep color 4
131 855—199:
Digital calorimetric thermometer calibration record format
1.1G H55—1994
Digital calorimetric thermometer calibration procedure
And regulations for the calibration of digital calorimetric thermometers (abbreviated as temperature) for newly manufactured, in use and after repair, with a measurement range of 0T: and a measurement error better than 0.3.
Overview
Thermometers are mainly used for precise measurement of temperature changes and other small temperature changes. They include calorimetric temperature measurement systems with direct display and equipped with digital computers for temperature difference measurement and data processing. 2. Technical requirements
1 Name
1.1 The appearance and structure of the thermometer should be smooth, without obvious deformation on the surface, and the induction of the surface should be uniform. The metal parts should not be rusted or damaged.
1.2 The name, model, measuring range, temperature scale symbol, working conditions, "certificate" mark, manufacturer, factory date and number of the thermometer should be complete and clear. 1.3 The switches and operation of each part of the thermometer should be reliable, and the parts should be tightened and inspected. 1.4 Thermometer sensor leads must be in good contact, the sensor casing must be sealed flat: there should be no obvious bending, and the length should be no less than 150mm
? Electrical inspection
2! The display of the thermometer should be clear, the millimeter should be accurate, there should be no missing strokes, the decimals and status display should be correct, and the thermometer with printing and recording function should record clearly without the phenomenon of incomplete characters. 2.2 For thermometers with negative value display, when displaying negative values, there should be a "" symbol. When the temperature is within the range of 100°C, there should be an overload indication symbol or soft-word: 3 Resolution
The temperature value indicated by the minimum value of the thermometer display should not be greater than the value of the temperature limit. When the thermometer display changes by one digit, the corresponding input value (converted into the corresponding temperature limit) should meet the requirements of the temperature meter resolution. The error should not be less than ten years of the temperature meter resolution. The difference between the temperature meter with a value displayed and the temperature meter with a zero value displayed should be less than 141% of the temperature meter resolution. Theorem
4.1 The thermometer is within 30mi The fluctuation of the indicated value within n should not exceed +0.04, 2. The thermometer value is determined within a verification cycle, and the difference in temperature error within 1°C should not exceed -.004°C.
5 The allowable error of the indicated value is shown in Table 1: 5
The minimum allowable value is the allowable temperature difference within any time limit above the specified interval.
JJ43 R55—1994
Controlled thermometer
Door mounted type: Computer can be used to display the temperature of the five mobile workers
Temperature certification of the whole machine time test number is not more than 15%
Equipped with micro-machine
Overflow meter
+0 002
Car environment is 15.-35:. Under the condition of relative humidity, 4--75%, the insulation tightness between the terminals of the temperature display part, the sensing lead and the shell is not less than the requirements in Table 2 below
Test point
Power supply or shell
Rider end
Start end ten
Anti-speed sensor
Maintenance heat
La or machine
|Self-tested sensor housing/M12
Under the conditions of ambient temperature of 1535℃ and relative humidity of 45%±5%, the terminals of the thermometer product are tested in Table 3. The sensor does not pierce through and no electric shock is produced. Table 3
Thanks to the pilot project
, the circuit is also learned from the special local records
According to the reform instructions
, everyone learned eleven. Power supply
Mature power (AC effective)
sng t:
-00 v
The voltage is AC 220 V. The total supply is F-703-194. The total equipment is 9:
: Please call and answer the call! Please check the main equipment. 2
JG 855-199:
Three connection conditions
9Standard instrument: Standard resistance thermometer. 10Calibration equipment: Thermometer calibration equipment name and main technical indicators table 111Calibration environment conditions
Environmental temperature is 15-35, and the relative humidity is not more than 75%. Table 4 Test group electrical standards and set retention values Water handle Signal generator Standard water volume group Meter Multi-purpose carbon High-voltage test bench Water-phase point phase change protection capacity 11.2 Thermometer power supply Key technical indicators After the entry is stopped, the whole The accuracy is not more than 0.02, the minimum value is not more than 0-50℃, the working area is 0.010r, the temperature difference is 5mm, the temperature of the water is dynamic ... Level
Can measure the power of 00
high voltage (.25kW
voltage change does not exceed 20% of the rated voltage; frequency change does not exceed 1% of the rated frequency: IV. Verification method
12 Appearance inspection
The sensor can be used as shown in the appendix
121 The appearance of the thermometer is observed by the H side, and the inspection of the operating chain switch is carried out by the card moving method. 3
JJG;8551994
122 The appearance of the temperature sensor is measured with a ruler. 13 Discharge inspection
Temperature After the meter is powered on, the temperature of the probe should be calibrated to see if it is normal. The temperature display and the state of the measurement should all meet the requirements of Article 2.
14 Verification of resolution
14! At least two temperature points should be randomly selected within the range of the thermometer to be tested. For thermometers with negative position, the resolution when the display is zero must be verified. 14.2 Wiring connection for verification
Connection in the wiring diagram of the thermometer
Display part
Figure 1 Diagram of the wiring connection for verification and resolution
11.3. Check the resolution by finding the conversion points: increase (upward stroke), decrease (downward stroke) the input of the display instrument, find the four conversion points A1+42, 41+2, convert A:, 41:2 into temperature values, and repeat the calibration at least 3 times towards the calibration point. A1 is the input point for the upward stroke, when the displayed value can just stabilize at the temperature value of the calibration point; A2 is the input point for the upward stroke, when the displayed value leaves the calibration point and switches to the next display value (a resolution value change basis) (including a single fluctuation between two display values); A3 is the input point for the downward stroke, when the displayed value can just stabilize at the calibration point. A, for the next step, the time when the displayed value leaves the calibration point and switches to the next display value (a change in resolution value) (including the fluctuation between the two display values), 14,4 calculate the difference between 4,4 and 4 for each calibration, and take the largest difference as the resolution error of the calibration point,
14.5 Thermometers with special types of sensors shall be calibrated for resolution in accordance with [4.2, 14.3 and 14.4=1. Other methods may be used for resolution calibration: 15 The calibration temperature point of the temperature indication error shall be determined according to the following method. The calibration point can be determined according to the thermometer components, but the two adjacent calibration points shall not exceed 11. [] For the thermometer with a base point temperature, the lower limit temperature of the thermometer is used as the starting point, and a calibration point is set every two years to the upper limit temperature: 15.12 The other points are used to set the thermometer in the same year. With each base point temperature as the starting point, a calibration point is set every two years to the temperature display value of (X-2). 4 JJC 855-1994 15.1.3 For the thermometer with a single point temperature that can be continuously adjusted, the lower limit temperature of the thermometer is used as the first base point temperature, and then each vehicle sets a measurement point temperature, with each agreed other point temperature as the starting point, and a calibration point is set every two years to the temperature display value of 7.
15.2 Verification of the error in the indication of thermometers: Use the comparison method. The starting temperature is the end temperature. Temperature rise verification: Before verification, the R value of the first-class standard electric thermometer must be measured in a water triple-point bottle. Use a standard mercury thermometer to determine the actual temperature of the constant temperature water bath. The deviation of each set point temperature must not exceed -1
15.2.2: Place the second-class standard platinum electric thermometer and the sensor of the thermometer to be tested in the constant temperature water bath. The depth of the tested thermometer should not exceed 150m.
15.2.3: After it stabilizes for 10mm, read the resistance value of the second-class standard platinum resistance thermometer and record the indications of the tested thermometers in turn. The reading order is:
Positive order: standard → plate test (1) test (7) *\ test () Reverse order: standard → test (1) test (2) ... + test () Take 1 reading as a group, and read 5 groups of data. Take the half-mean of the 5-dimensional data of the standard platinum resistance thermometer to obtain the actual temperature of the plant. Take the average value of the 5 groups of readings of the test thermometer and calculate the indication error of each thermometer.
Then proceed to the indication error verification of the next calibration point: 16 Verification of differential measurement error
When determining the temperature difference measurement error of the thermometer and the indication error verification, the temperature difference measurement error is the value of the minimum error of the two adjacent calibration points: the differential measurement error of other temperature intervals is the maximum value of the difference between the indications of any two calibration points within the two intervals. 17 Verification of linear error
17.1 For thermometers with adjustable (including continuously adjustable) base temperature, the midpoint of any two equal small error verification points shall be selected for verification in the value identification and verification of the fixed point with each base temperature (including the set base temperature) as the starting point.
For thermometers with fixed base temperature, the midpoint of any two adjacent error verification points shall be selected for verification in the display value range.
17.2 Verification of total error shall be carried out during the verification of the error of indication of the thermometer: the error of indication at the midpoint shall be determined by the method described in 15.2. Calculate the indication error value of the middle point by the internal capture method. The error value is the difference between the error of the middle point and the linear error 18. The indication stability is verified by
1. In the process of small value error verification of thermometer, take any temperature point, 15.2 households, verify the indication error of the temperature point 5min each time, and determine 30trinl in total. The temperature increase should be short and rise (or fall) during the verification, and the rise (or fall) should be less than 0.004: calculate the difference between the maximum value error and the minimum indication error, and take the absolute value of the difference as the indication error validity at 3min. 5
J.IG8551994||t t||182 Temperature change question The temperature difference measured to the setting 2 is compared with the calibration result of the previous inspection period, and the virtual user 1. The regulations of
1 are as follows: The constant temperature water is estimated to be other constant temperature contents: The temperature of the thermometer is set to a certain point (the air temperature is close, the temperature of the thermometer is adjusted to a certain point, and the temperature has been set to a certain point in the book: The thermometer sensor is drawn into warm water (other temperature devices, inside, after it is set to 0, this speed will take another temperature sensor, within a certain period of time, the temperature of the thermometer indication drops to the time when the temperature difference disappears by at least 50 hours. The time taken for the repeated measurement is the time constant of the temperature meter, and the initial result of the emergency should be within the following average value: ||tt ||The temperature sensor and the temperature water increase before opening (or constant temperature specification) to the specified value of the constant temperature small beat the time required for the meter to pass the knock test "temperature meter", and the cabinet temperature water tank wire bottom small Ding: 20 insulation electrical measurement
Temperature: The power switch is in the on position, for the temperature within the range of 50500V, a megameter with a DC voltage of 1m must be used. For the temperature meter with a voltage below V, use a rated DC voltage of 1+100V to measure the position according to the 7th tea specification. The main measurement should be 5, and the absolute value 4 of the pin
will be measured by the meter after the meter is in the middle of the diameter h, and the energy between the meter and the outside of the meter should be measured with an effective force meter. Frequency: 21 Absolute intensity measurement purpose
Temperature meter source! The United States is connected to the position, the circuit itself is connected to the circuit, and then according to the provisions of Section 8, the high-voltage test is carried out from the top. The measurement starts with the minimum value of the test voltage, and the vehicle is 5, and the half-pollution is raised to the ground. The test voltage error is not expected to exceed +chuan%. The test voltage is 1: After the smooth discharge, the supply is properly reduced:
The new design and selection of the temperature meter must meet the requirements of Sections 14, 19, 20, and 1.
5. Processing of verification results and verification period
22. The design of the system is divided into the following formulas:
4A -A, - 2 1
AA -IA.-A:1
Wherein: A——three-stroke hourly salary,; A——downward release hourly efficiency,
indicates the relative difference of the upper and lower forces. The following formula can be used to calculate: (1)
.IG: #55—1994
——the analytical error of the small value of the chain force!
The maximum value of each group value in the calibration: The maximum value of each group value of the thermometer
23 The indication error of the thermometer
The indication error is calculated according to the public standard;
Atu = tan - t(n
Wu:
! When the base temperature of the temperature is wt:, the displayed temperature or value is the indication error; n()\ When the base temperature of the thermometer is wt:, the average value of the 5 groups of displayed temperature values t:; ti
The actual temperature value of the second-class standard electric limit thermometer at the measurement point, j=1
) value is calculated according to the method of "International Temperature Standard ITS", 24 The temperature source to the measured layer base
24, the temperature difference between each thermometer is calculated according to the following formula: Aar.rd - Ar -A
The temperature should be the base temperature when the temperature is [a point in the kitchen is measured and the error is,
is the temperature when the temperature is more, the error of any temperature interval is calculated by the formula: At...*+ - 2..2 - Ar.?
, the full point temperature is, the error of the error can be divided into (:, the temperature zone is:, the temperature display error is eliminated, the heart. 25 According to the temperature method of this standard, the qualified temperature will be issued a calibration certificate, and the unqualified temperature will be issued a calibration certificate before the temperature is calculated. In the calibration certificate, the temperature gauge of each forbidden point temperature will be corrected and estimated. [Its temperature display error is given, and the correct amount will be adjusted according to the regularization of the temperature. The temperature is not corrected and stored according to the following formula:
Ks =Ar.t.
Wu Zhong: Base point temperature is the time when the temperature or the temperature indicated by the meter is the indicated value (8)
The temperature meter that meets the temperature range can be issued a certificate of initial adjustment. The qualified temperature range must be noted on the specification sheet:
2 The adjustment period of the temperature can be determined according to the specific test conditions and its stability, and the minimum limit is 1 year. Appendix 1
1 Base point temperature
JJG 855—1994
Main terms and definitions
Digital calorimeters are mainly used for temperature difference measurement. The base point temperature refers to the actual temperature value represented when the displayed value is (℃.
2 Temperature difference
refers to the change in temperature at any interval measured by a digital calorimeter: 5
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