JJG 123: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| JJG 123-2005 | English | RFQ |
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3 days [Need to translate]
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Measuring Ruler for Difference of Wheels Set Position and Brake Discs Set Position of Railway Vehciles
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JJG 123-2005
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| JJG 123-2004 | English | 759 |
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5 days [Need to translate]
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Verification Regulation of D.C. potentiometers
| Valid |
JJG 123-2004
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| JJG 123-1988 | English | 879 |
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6 days [Need to translate]
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DC Potentiometers
| Obsolete |
JJG 123-1988
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| JJG 123-1976 | English | RFQ |
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3 days [Need to translate]
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(Chinese Industry Standard)
| Obsolete |
JJG 123-1976
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Standard similar to JJG 123-2005 JJG 249 JJG 404 JJG 134 Basic data | Standard ID | JJG 123-2005 (JJG123-2005) | | Description (Translated English) | Measuring Ruler for Difference of Wheels Set Position and Brake Discs Set Position of Railway Vehciles | | Sector / Industry | Metrology & Measurement Industry Standard | JJG 123-2004: Verification Regulation of D.C. potentiometers---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.
Verification Regulation of DCpotentiometers
National Metrology Verification Regulations of the People's Republic
DC potentiometer
Released on.2004-09-21
2005-03-21 implementation
The General Administration of Quality Supervision, Inspection and Quarantine issued
DC potentiometer verification procedure
Replace JJG 123-1988
This regulation was approved by the General Administration of Quality Supervision, Inspection and Quarantine on September 21,.2004, and
It will take effect on March 21,.2005.
Focal Point. National Electromagnetic Measurement Technical Committee
Main drafting unit. Shanghai Institute of Metrology and Testing Technology
Participated in the drafting unit. Shanghai Precision Scientific Instrument Co., Ltd.
This procedure entrusts the National Electromagnetic Measurement Technical Committee to explain
The main drafters of this procedure.
Yan Yanliang (Shanghai Institute of Metrology and Testing Technology)
Shi Xiaotao (Shanghai Institute of Metrology and Testing Technology)
Participate in the drafters.
Sang Shiming (Shanghai Precision Scientific Instrument Co., Ltd.)
table of Contents
1 Scope (1)
2 Citations (1)
3 terms (1)
4 Overview (2)
5 Metrological performance requirements (2)
5.1 Basic error (2)
5.2 Accuracy level (3)
5.3 Measuring the incremental linearity of the disc (3)
5.4 indication value deterioration (3)
5.5 Temperature compensation disk (3)
5.6 Measuring the operating current of the disc at any indication (3)
5.7 Internal working current adjustment device (3)
5.8 Refers to the zero instrument (3)
5.9 Insulation resistance (4)
6 General technical requirements (4)
6.1 Appearance and line inspection (4)
6.2 Dielectric strength test (5)
7 measuring instrument control (5)
7.1 Verification conditions (5)
7.2 Verification project (7)
7.3 Verification method (7)
7.4 Processing of verification results (15)
7.5 Verification cycle (15)
Appendix A Several Measurement Methods for Potentiometer (16)
Appendix B Format of verification certificate and verification result page (24)
DC potentiometer verification procedure
1 Scope
This procedure is applicable to the first verification of a resistive DC potentiometer with an accuracy class of 0.0005 to 0.1.
Subsequent verification and in-use inspection.
This procedure does not apply to.
a) automatically obtain a zero-balance potentiometer;
b) using a balance detector scale to obtain a partial difference value of the potentiometer;
c) DC comparison ceremony potentiometer;
d) Potentiometers for other special purposes.
2 Citations
This procedure refers to the following documents
JJF1059-1999 "Measurement and Expression of Measurement Uncertainty"
JJF1015-2002 "General Specification for Type Evaluation and Type Approval of Measuring Instruments"
GB 4793-1995 "Safety requirements for electrical equipment for measurement, control and laboratory"
GB 3927-1983 "DC potentiometer"
JB/T 8611-1997 "DC potentiometer"
Use of this procedure should take care to use the current valid version of the above cited documents.
3 terms
3.1 DC potentiometer (hereinafter referred to as potentiometer)
Is a voltage measuring instrument that balances the measured voltage with a known voltage, which can be
A fixed current flows through the adjustable resistor or is obtained by passing a variable current through a fixed resistor, or a combination thereof.
3.2 Measuring plate
The dial that determines the measured value, if any, should also be multiplied by the corresponding range factor.
3.3 Effective range
For a specified range factor, the potentiometer can measure the range of the scale according to the specified accuracy.
3.4 range converter
A device that multiplies the effective range by a factor called the "sampling factor" (for example, 0.1).
3.5 Standardization of potentiometer
In order to ensure the necessary adjustment of the accurate indication when measuring the potentiometer.
3.6 scale display value
The potentiometer is balanced to measure the number of discs. When the potential difference meter is standardized to determine the measured voltage, multiply the amount
Process coefficient ratio.
3.7 Auxiliary equipment
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