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JJF 1638-2017: Calibration Specification for Multifunction Standard Sources
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Calibration Specification for Multifunction Standard Sources
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JJF 1638-2017
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Basic data | Standard ID | JJF 1638-2017 (JJF1638-2017) | | Description (Translated English) | Calibration Specification for Multifunction Standard Sources | | Sector / Industry | Metrology & Measurement Industry Standard | | Classification of Chinese Standard | A55 | | Classification of International Standard | 17.220 | | Word Count Estimation | 29,239 | | Date of Issue | 2017-09-26 | | Date of Implementation | 2018-03-26 | | Older Standard (superseded by this standard) | JJG 445-1986 | | Quoted Standard | JJF 1001-2011; GB/T 15637-2012 | | Regulation (derived from) | General Administration of State Quality Inspection Announcement 2017 No. 78 | | Issuing agency(ies) | General Administration of Quality Supervision, Inspection and Quarantine | | Summary | This standard applies to the calibration of a multi-standard source with the highest accuracy level better than that of DC 0.01 and AC 0.05, with DC voltage, DC current, DC resistance, AC voltage, and AC current output functions. It is also applicable to having the above single output. Calibration of the standard source of function or combination output function. This standard DC voltage calibration range �� 10 mV ~ �� 1 000 V, AC voltage calibration range 10 mV ~ 1 000 V (10 Hz ~ 1 MHz), DC current calibration range �� 10��A ~ �� 100 A, AC current calibration range 10 mA to 100 A (10 Hz to 10 kHz), DC resistance calibration range 1�� to 1 G��. | JJF 1638-2017: Calibration Specification for Multifunction Standard Sources---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
CalibrationSpecificationforMultifunctionStandardSources
People's Republic of China National Metrology Technical Specifications
Multi-standard source calibration specification
Published on.2017-09-26
2018-03-26 implementation
The State Administration of Quality Supervision, Inspection and Quarantine issued
Multi-standard source calibration specification
Instead of JJG445-1986
Integral Unit. National Electromagnetic Measurement Technical Committee
Drafted by. China Academy of Metrology
Liaoning Institute of Metrology
Participated in the drafting unit. Metropolitan Metrological Testing Institute
Dalian Metrology and Inspection Institute
Shandong Institute of Metrology
This code entrusts the National Electromagnetic Measurement Technical Committee to explain
The main drafters of this specification.
Zhao Honggang (China Institute of Metrology)
Liang Guoding (Liaoning Provincial Institute of Metrology)
Pan Xianlin (China Institute of Metrology)
Participating drafters.
Li Wei (Chengdu Metrology and Testing Institute)
Zhao Mengyu (China Academy of Metrology Sciences)
Zhao Xiaojun (Dalian Metrology and Inspection Institute)
Ma Xuefeng (Shandong Institute of Metrology Research)
table of Contents
Introduction (II)
1 Scope (1)
2 References (1)
3 Overview (1)
4 Metrological characteristics (1)
4.1 Error indication (1)
4.2 Maximum allowable error (2)
5 Calibration Conditions (2)
5.1 Environmental Conditions (2)
5.2 Measurement Standards and Other Equipment (2)
6 Calibration Items and Calibration Methods (3)
6.1 Calibration Items (3)
6.2 appearance and power check (3)
6.3 Selection Principles of Calibration Points (4)
6.4 DC voltage indication error (4)
6.5 DC Current Error (7)
6.6 DC resistance indication error (8)
6.7 AC voltage indication error (10)
6.8 AC Current Indication Error (13)
7 Expression of Calibration Results (15)
8 Re-school interval (15)
Appendix A Evaluation Example of DC Voltage Calibration Uncertainty (16)
Appendix B Calibration Original Recording Format (19)
Appendix C Internal Format of Calibration Certificate (21)
Introduction
This specification is based on JJF 1071-2010 "Rules for the preparation of national metrological calibration specifications", JJF 1059.1-2012
"The measurement of uncertainty evaluation and expression" preparation.
This specification replaces JJG445-1986 "DC standard voltage source" and the scope of application is revised to the highest DC voltage standard.
Accuracy level is better than class 0.01 DC standard voltage source, and calibration items and calibration methods for DC voltage are performed
Rewrite it.
The previous releases of this specification are.
---JJG445-1986.
Multi-standard source calibration specification
1 Scope
This specification applies to the highest accuracy level better than DC 0.01 and AC 0.05, with DC voltage, straight
The calibration of multi-function standard sources for current, DC resistance, AC voltage, and AC current output functions also applies to
Calibration of the standard source with the above single output function or combined output function.
The DC voltage calibration range of this specification is ±10mV~±1000V, and the AC voltage calibration range is 10mV~
1000V (10Hz~1MHz), DC Current Calibration Range ±10μA~±100A, AC Current Calibration Range
10mA~100A (10Hz~10kHz), DC resistance calibration range 1Ω~1GΩ.
2 references
This specification refers to the following documents.
JJF 1001-2011 Universal Measurement Terms and Definitions
GB/T 15637-2012 General Specifications for Digital Multimeter Calibrators
For dated references, only dated editions apply to this specification; all undated references
The latest version (including all amendments) applies to this specification.
3 Overview
The multi-standard source is a high-precision, high-accuracy standard signal source for digital display and can output AC voltage,
DC voltage, AC current, DC current, DC resistance 5 kinds of electrical signals, usually used to have one or more of the above
The digital meter of the measurement function is calibrated.
The multi-standard source is mainly composed of a power supply unit, a reference standard unit, an amplifying unit, an output buffer unit, and a control unit.
System unit and other components.
4 Metrological characteristics
4.1 Indication error
The indication errors of DC voltage, DC current, DC resistance, AC voltage and AC current are all given by formula (1)
Said that the relative indication error is represented by formula (2).
Δ=Yx-Ys (1)
In the formula.
Δ --- indication error;
Yx---The output of the calibrated standard source.
Ys --- corresponding to the reference value of the output (standard value).
γ=
Yx-Ys
Ys ×100%
(2)
In the formula.
γ --- relative indication error.
4.2 Maximum allowable error
For multi-range AC voltage, DC voltage, AC current, DC current, DC resistance function, each function
Different maximum allowable error indicators are allowed for each range. For AC voltage and AC current, same function
In a range, different frequency bands also allow different maximum allowable error indicators.
The maximum allowable error of DC voltage, DC current, DC resistance, AC voltage and AC current can generally be used
Formula (3) shows. The relative maximum allowable error can generally be expressed by formula (4).
ΔMPE= ±(a%Yx b%Ym) (3)
In the formula.
ΔMPE --- maximum allowable error;
Yx --- output of the standard source;
Ym --- standard source output range value;
a --- error coefficient associated with the output indication;
b --- The error coefficient associated with the output range value and requires a >b.
γMPE=
ΔMPE
Yx ×100%=±a% b%
Ym
Yx
÷×100% (4)
In the formula.
γMPE---relative maximum allowable error.
Note.
1. The range value is the abbreviation of the range rating, generally the upper limit of the range. For example, a standard source 1V range output range is
0.000V~1.199V, it is generally considered that the range value is 1V.
2. By comparing the indication error and the maximum allowable error of a calibration point to determine whether the test point meets the requirements, if using
In the specification, only the annual stability index is given and no standard source of maximum allowable error is given. The year stability indicator can be used.
Marked as the maximum allowable error of the instrument. The probability of confidence in the annual stability indicator given in the instructions is not only
First, the annual stability index with a large confidence probability is regarded as the maximum allowable error.
5 calibration conditions
5.1 Environmental conditions
Ambient temperature. 20 °C ± 2 °C;
Relative humidity. ≤75%;
AC supply voltage. 220V±22V;
Power frequency. 50Hz ± 0.5Hz.
Note. The allowable deviation of ambient temperature and AC supply voltage can also refer to the instructions in the instrument's instruction manual.
5.2 Measurement Standards and Other Equipment
5.2.1 The standard equipment and supporting equipment required for calibration are shown in Table 1, which can be based on the actual needs of the multi-standard source being calibrated.
Seeking choice.
5.2.2 The absolute value (or uncertainty) of the maximum allowable error of the corresponding function of the calibration device shall not be greater than the calibrated standard source
The 1/3 of the absolute value of the maximum allowable error of the corresponding function.
5.2.3 The calibration device (including the measurement circuit) should have good shielding protection and grounding measures, and stay away from strong electric fields
Strong magnetic field.
Table 1 Standard Equipment and Related Equipment
No. Instrument Name Application and Description
1 Digital Multimeter
Calibrate DC voltage, DC current, DC resistance, AC voltage and AC
Stream output function;
AC/DC conversion method for measuring output voltage when calibrating AC voltage
2 AC Measurement Standards Calibrate AC Voltage and AC Current Output Functions
3 AC/DC conversion standard calibration AC voltage and AC current output function
4 standard resistors
Calibrate DC resistance output function;
The rated voltage (current) of the standard resistor should not be less than that used during calibration
Pressure (current) and considering its temperature coefficient
5 Solid State Voltage Standard Calibration DC Voltage Output Function
6 Standard multifunction source (including single function source) Calibration DC voltage and AC voltage output function
Standard voltage divider
(DC voltage divider, AC voltage divider)
Calibration of DC voltage and AC voltage output function;
The rated input voltage of the standard voltage divider should meet the calibration requirements
Current Voltage Converter
(AC/DC current splitter)
Calibrate DC current and AC current output function;
The standard shunt's rated current should not be less than the current used during calibration, and
Consider its power factor and temperature coefficient
6 Calibration Items and Calibration Methods
6.1 Calibration Project
See Table 2 for calibration items.
Table 2 List of calibration items
No. Calibration Item Calibration Method Terms
1 appearance and power check 6.2
2 DC voltage indication error 6.4
3 DC current error 6.5
4 DC resistance indication error 6.6
5 AC voltage indication error 6.7
6 AC current indication error 6.8
6.2 appearance and power check
The calibrated multi-standard source should be in good condition and have no mechanical damage that will affect normal operation;
Instrument name, model number, serial number, production unit or trademark, production date, power supply voltage and frequency,
Each terminal and input/output port should be clearly marked;
Attachments should be complete;
The switches, knobs, and keys should work properly.
Display function should be normal, electrical work is normal;
Preheat and preset according to the requirements and regulations of the manual of the calibrated multi-standard source.
6.3 Selection Principles of Calibration Points
6.3.1 Precautions
a) The selection of calibration points should cover all ranges and take into account the coverage between the various ranges and the uniformity within the range.
At the same time, reference should be made to the calibration point recommendations in the calibration standard source operating instructions.
b) The calibration point can be selected according to the actual situation or the requirements of the school unit.
6.3.2 DC voltage
a) Select 3~5 calibration points for positive polarity of basic range;
b) Select 2~3 calibration points for positive polarity of non-basic range;
c) The negative polarity of each range can only select one calibration point for the range value (approximate range value);
d) When the polarity is positive, the 10% point and range value of the span value should be covered within the calibrated range (close range)
Value) point.
6.3.3 DC current
With reference to the selection principle of 6.3.1, it is also possible to select only 10 integer power points for positive and negative polarities of each range.
6.3.4 DC resistance
If the output is fixed, each resistance output is a calibration point; if it is continuously adjustable, select each
The range's range value (near range value) point, or an integer power point of 10.
6.3.5 AC voltage
a) The frequency point can be selected according to the technical specifications of the AC voltage in the instruction manual
6 frequency points (usually 1 kHz), taking into account low frequency points and high frequency points. At 10Hz, 50Hz
(60Hz), 400Hz, 1kHz, 10kHz, 20kHz, 50kHz, 100kHz, 300kHz, 500kHz,
Select in 1MHz.
b) Select 2~3 voltage calibration points for each voltage range at 1kHz frequency point; at other frequency points, only
Select the span value or an integral power point of 10 as the calibration point.
c) Select the calibration point according to the voltage frequency product (V·Hz) of the calibrated standard source;
6.3.6 AC current
a) The frequency point can be selected according to the technical specifications of the AC current in the manual
5 frequency points (usually 1 kHz), taking into account low frequency points and high frequency points. At 10Hz, 50Hz
(60Hz), 400Hz, 1kHz, 5kHz, 10kHz is preferred;
b) current calibration point Select the span value (approximate range value) for each range, or select an integer number of 10
Power point.
6.4 DC voltage indication error
When calibrating the DC voltage, it is necessary to pay attention to the selection of a low thermoelectric potential test line to reduce the influence of the thermoelectric power on the calibration result;
The effect of the zero and input impedance of the selected standardizer and the test line resistance on the measurement results should be taken into consideration.
6.4.1 Standard Table Method
The connection is shown in Figure 1.
Figure 1 Calibration of DC voltage with standard meter method
Measure the output voltage of the calibrated multi-standard source directly with a standard digital multimeter, and the reference value of the measurement result
Us, the calibrated multi-function standard source voltage output value is Ux, then the calibrated multi-standard source shows the error
Formula (5) indicates.
Δ=Ux-Us (5)
In the formula.
Δ --- indication error, V;
Ux--- is the output of the calibrated multi-standard source, V;
Us---The reference value of the standard digital multimeter, V.
The relative error is expressed by formula (6).
γ=
Ux-Us
Us ×100%
(6)
In the formula.
γ --- relative indication error.
6.4.2 Standard Source Method
The connection is shown in Figure 2.
Figure 2 Standard Source Method for Calibrating DC Voltage
The calibrated multi-function standard source and the standard multi-function standard source output the same indication of the DC voltage, first with the transition number
The multimeter measures the output voltage of a standard multi-standard source and measures Ui. Then measure the calibrated multifunction
The output voltage of the quasi-source is measured as Uo. The actual value of the standard multi-function standard source output voltage is Uref.
The quasi-multi-standard source output voltage is Us=Uref Uo-Ui. The calibrated multi-function standard source output indicates Ux.
The indication error of the calibrated multi-standard source is represented by equation (7).
Δ=Ux-Uref-Uo Ui (7)
In the formula.
Δ --- indication error, V;
Ux --- output of the calibrated multi-standard source, V;
Uref---Output actual value of standard multi-function standard source, V;
Uo --- Measure the measured value of the calibrated multi-standard source with a transitional multimeter, V;
Ui --- Measure the value of a standard multi-standard source with a DMM, V.
The relative error is expressed by formula (8).
γ=
Ux-Uref-Uo Ui
Uref Uo-Ui × 100%
(8)
In the formula.
γ --- relative indication error.
6.4.3 Resistive partial pressure box method
Resistance divider box method connection shown in Figure 3.
Figure 3 Resistor divider box calibration DC voltage schematic
Connect the voltage terminals of the DMM and DMM to the corresponding terminals of the resistor divider
Button, the ratio of the two is K. The reference DMM traces back to the solid-state voltage standard and regulates the input of the DC voltage source
The value of the reference voltage of the reference digital multimeter of the resistor divider box is the reference value of the source point to be traced, and its value is Uref. this
The voltage at the terminal of the transition digital multimeter of the resistance divider box is kuref. Transition Digital Multimeter Measurement Resistance Divider Box
Corresponds to the voltage of the terminal button, its measured value is Ui, does not change the setting of the transitional digital multimeter, switches the low thermoelectric potential conversion
Switch, calibrated multi-standard source output voltage with transitional DMM, measured value Uo, calibrated
The multi-standard source output voltage is Us=KUref Uo-Ui. Calibrated multi-standard source voltage output output
Ux, the indication error of the calibrated multi-standard source is represented by equation (9).
Δ=Ux-KUref-Uo Ui (9)
In the formula.
Δ --- indication error, V;
Ux --- output of the calibrated multi-standard source, V;
K --- transitional digital multimeter and reference digital multimeter connected to the terminal at the resistor divider partial pressure ratio;
Uref---Reference voltage divider box reference digital multimeter terminal button voltage, V;
Uo --- transitional DMM measures the measured value of the calibrated multi-standard source voltage, V;
Ui --- transitional DMM measures the measured value of the terminal voltage of the resistor divider box, V.
The relative error is expressed by formula (10).
γ=
Ux-KUref-Uo Ui
KUref Uo-Ui × 100%
(10)
In the formula.
γ --- relative indication error.
6.5 DC current indication error
6.5.1 Standard Table Method
The connection is shown in Figure 4.
Fig. 4 Calibration of DC current with standard table method
Measure the output current value of the calibrated multi-standard source directly with a standard digital multimeter, and the reference value of the measurement result
Is, the calibrated multi-function standard source current output shows a value of Ix, which is used to calibrate the indication error of the multi-standard source
Formula (11) indicates.
Δ=Ix-Is (11)
In the formula.
△ --- indication error, A;
Ix --- calibrated multi-standard source current output indication, A;
Is---The measurement result reference value of the standard digital multimeter, A.
The relative error is expressed by formula (12).
γ=
Ix-Is
Is ×100%
(12)
In the formula.
γ --- relative indication error.
6.5.2 Current-voltage conversion method
Connected as shown in Figure 5, need to pay attention to the choice of resistance of the current and voltage converter, reduce the multi-standard source
Load effect.
Figure 5 Current and voltage conversion method calibration DC current
Connect the current terminal of the current-voltage converter to the current output circuit of the calibrated multi-standard source.
The potential terminal of the converter is connected to the voltage input terminal of the standard digital multimeter to convert the current into the voltage. Current and voltage
The resistance value of the converter is Rs. The reference value of the standard digital multimeter voltage measurement is Us. The measured multi-standard is calibrated.
The source current output value is Is=Us/Rs. The calibrated multi-function standard source current output shows the value of Ix, which is calibrated for multiple functions.
The indication error of the standard source can be expressed by formula (13).
Δ=Ix-Us/Rs (13)
In the formula.
△ --- indication error;
Ix --- calibrated multi-standard source current output indication, A;
Us---Measure the reference value of the voltage on the current-voltage converter with a standard digital multimeter, V;
Rs --- resistance of current-voltage converter, Ω.
The relative error is expressed by formula (14).
γ=
Ix-Us/Rs
Us/Rs × 100%
(14)
In the formula.
γ --- relative indication error.
6.6 DC resistance indication error
6.6.1 Standard Table Method
The connection is shown in Figure 6 and Figure 7.
Fig. 6 Calibration of DC resistance with standard table method (four-wire system)
Fig. 7 Calibration of DC resistance with standard table method (two-wire system)
The output resistance of the calibrated multi-standard source is measured directly with a standard digital multimeter. The measured value is Rs.
Calibrated multi-function standard source output resistance indication value is Rx, then calibrated multi-standard source indication error formula (15)
Said.
Δ=Rx-Rs (15)
In the formula.
Δ --- indication error, Ω;
Rx --- Output of the calibrated multi-standard source, Ω;
Rs --- Reference value of the standard digital multimeter, Ω.
The relative error is expressed by formula (16).
γ=
Rx-Rs
Rs × 100%
(16)
In the formula.
γ --- relative indication error.
6.6.2 Standard resistor method
The connection is shown in Figure 8 and Figure 9.
Fig. 8 Calibration of DC resistance with standard resistor method (four-wire system)
Fig. 9 Calibration of DC resistance with standard resistor method (two-wire system)
The resistance value of the standard resistor is first measured with a transitional multimeter, and the measured value is Ri. Then the measurement is calibrated
The output resistance of the functional standard source, the measured value is Ro, and the standard resistance value is Rref, then the functional standard is calibrated
The source resistance output value is Rs=Rref Ro-Ri. If the calibrated multi-standard source resistance output value is Rx, it will be calibrated.
The indication error of the quasi-multi-functional standard source is represented by formula (17).
Δ=Rx-Rref-Ro Ri (17)
In the formula.
Δ --- indication error, Ω;
Rx --- Output of the calibrated multi-standard source, Ω;
Rref---standard resistance, Ω;
Ro --- Measure the measured value of the calibrated multi-standard source with a transitional multimeter, Ω;
Ri --- Measure the value of standard resistance with a transitional multimeter, Ω.
Its relative error is expressed by formula (18).
γ=
Rx-Rref-Ro Ri
Rref Ro-Ri × 100%
(18)
In the formula.
γ --- relative indication error.
6.7 AC voltage indication error
When calibrating the AC voltage, it is necessary to pay attention to the effect due to the insufficient input impedance of the standard device, at higher frequencies.
Shorter coaxial lines should be used as test leads.
6.7.1 Standard Table Method
The connection is shown in Figure 10.
Figure 10 Standard AC voltage calibration diagram
Measure the AC output of the calibrated multi-standard source using a standard digital AC voltmeter (AC measurement standard)
Pressure, its measured value is Ux, standard multi-standard standard source voltage output value is Us, it is calibrated multi-standard source input
The voltage indication error is expressed by formula (19).
Δ=Ux-Us (19)
In the formula.
Δ --- indication error, V;
Ux---The AC voltage output of the calibrated multi-standard source indicates, V;
Us---Standard multi-function standard source AC voltage output value, V.
The relative error is expressed by formula (20).
γ=
Ux-Us
Us ×100%
(20)
In the formula.
γ --- relative indication error.
6.7.2 AC-DC conversion method
The connection is shown in Figure 11.
Figure 11 AC voltage calibration AC voltage diagram
Set the transfer switch to the multi-standard source, set the multi-standard source to be calibrated to Ux
After the record, the transition number is multi-used to represent the value Ut. Will pass transfer switch to DC voltage source, adjust its output value, etc.
Wait for AC/DC conversion standard thermoelectric balance and make the transition digital multi-use representation stable to Ut, record the standard digital multimeter
Measurement result reference value Ui1, change the polarity of the standard DC voltage source, adjust its output value, wait for the AC-DC conversion standard
The thermoelectric balance makes the digital multi-use display value stable to Ut, and the standard digital multimeter measurement result reference value Ui2 is recorded. meter
The average of the absolute values of Ui1 and Ui2 is calculated and recorded as Us. Repeat the above process several times to take Us as the average Us.
The calibrated multi-standard source output voltage indication error is represented by equation (21).
Δ=Ux-Us ∂ (21)
In the formula.
Δ --- indication error, V;
Ux --- output of the calibrated multi-standard source, V;
Us --- Standard DC voltage source output value, V;
∂ - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - = 0, V
The relative error is expressed by formula (22).
γ=
Ux-Us ∂
Us
×100% (22)
In the formula.
γ --- relative indication error.
6.7.3 AC Voltage Divider Method (Dual Source Method) to Calibrate Low Value AC Voltage
The dual-source calibration low-voltage AC voltage connection is shown in Figure 12.
Figure 12 AC Voltage Divider Calibration for Low AC Voltage
The transfer switch is set to be multi-standard source, and the multi-standard source is set as the standby value Ux.
The digital voltage represents Ut. The transfer switch will be set to a standard AC voltage source, adjust the output value, make the number more
With the stated value of Ut, record the standard AC voltage source output actual value Us. Because the AC voltage divider AC voltage divider ratio is
K, the AC voltage in...
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