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JJF 1726-2018 English PDF

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JJF 1726-2018: Calibration Specification for Digital Electrometers
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Basic data

Standard ID JJF 1726-2018 (JJF1726-2018)
Description (Translated English) Calibration Specification for Digital Electrometers
Sector / Industry Metrology & Measurement Industry Standard
Classification of Chinese Standard A55
Word Count Estimation 34,388
Date of Issue 2018-12-25
Date of Implementation 2019-03-25
Regulation (derived from) State Administration of Markets, Announcement No. 34 of 2018
Issuing agency(ies) State Administration for Market Regulation

JJF 1726-2018: Calibration Specification for Digital Electrometers

---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.
(Digital Electrometer Calibration Specification) National Metrology Technical Specification Digital Electrometer Calibration Specification Published on.2018-12-25 2019-03-25 implementation State Market Supervisory Administration released Digital Electrometer Calibration Specifications Focal Point. National Electromagnetic Measurement Technical Committee Main drafting unit. Beijing Oriental Metrology and Testing Institute Participated in the drafting unit. Dalian Institute of Metrology and Testing Beijing Institute of Metrology and Measurement Science Guangdong Institute of Metrology This specification entrusts the National Electromagnetic Measurement Technical Committee to explain The main drafters of this specification. Jin Haibin (Beijing Oriental Metrology and Testing Institute) Hao Tingting (Beijing Oriental Metrology and Testing Institute) Zhao Zhi (Beijing Oriental Metrology and Testing Institute) Participate in the drafters. Zhao Xiaojun (Dalian Metrology and Testing Institute) Fang Fei (Beijing Institute of Metrology and Measurement Science) Wu Haiyi (Guangdong Institute of Metrology)

table of Contents

Introduction (II) 1 Scope (1) 2 References (1) 3 Terms and units of measurement (1) 4 Overview (1) 5 Measurement characteristics (1) 5.1 Voltage measurement indication error (1) 5.2 Current measurement indication error (2) 5.3 Resistance measurement indication error (2) 5.4 Charge measurement indication error (2) 5.5 Voltage output indication error (2) 6 Calibration conditions (2) 6.1 Environmental conditions (2) 6.2 Measurement standards and other equipment (3) 7 Calibration items (3) 8 Calibration method (3) 8.1 Preparation before calibration (3) 8.2 Voltage measurement indication error (4) 8.3 Current measurement indication error (5) 8.4 Resistance measurement indication error (7) 8.5 Charge measurement indication error (8) 8.6 Voltage output indication error (9) 9 Calibration result expression (10) 9.1 Calibration Certificate (10) 9.2 Data Repair (10) 10 re-study interval (10) Appendix A Example of Digital Electrostatic Meter Calibration Uncertainty Evaluation (11) Appendix B Calibration Original Record Format (25) Appendix C Calibration Certificate Page Format (27)

Introduction

This specification is based on JJF 1071-2010 "Rules for the preparation of national metrology and calibration specifications", JJF 1059.1-2012 Compilation of Measurement Uncertainty and Representation. This specification is the first release. Digital Electrometer Calibration Specifications

1 Scope

This specification is applicable to measuring current not less than 0.1pA, resistance not more than 10PΩ, charge not less than 0.1nC, Calibration of digital electrometers with voltages not greater than 1 kV. Also suitable for ultra high resistance, micro current, Calibration of the microcharge measurement function.

2 reference files

This specification refers to the following documents. JJF 1023-1991 Commonly used electrical metrology terminology (trial) For dated references, only dated versions apply to this specification; undated quotations The latest version (including all amendments) applies to this specification.

3 terms and units of measure

3.1 Electrometer meter Electrometer is based on the principle of electrostatic amplifier measurement for high resistance, micro current, charge and high input impedance Multi-function measuring instrument for voltage measurement.

4 Overview

Digital electrometers are mainly composed of high input impedance, low input bias current electrostatic amplifier and different feedback networks. The composition is switched by a switch to form a measuring circuit, and the signal to be tested is converted into a DC voltage, and then passed through an analog-to-digital converter. Transform into a digital signal display. Resistance measurement generally applies a constant voltage to the measured resistance, and uses current to measure the work. Ability to measure the resistance; current measurement generally uses a high value feedback resistor to convert the microcurrent into a voltage; Measurement uses capacitive feedback to convert charge into voltage; voltage measurement uses in-phase amplification of an electrostatic amplifier A voltage measurement that achieves high input impedance. Digital electrometers are mainly used for high value resistance, weak current, charge and voltage testing, such as photomultiplier tubes and The current output from the ionization chamber and weak current measurements such as semiconductors and mass spectrometers can also be used for surface insulation Resistance, measurement of material resistivity, and measurement of electrostatic charge and high internal resistance source voltage.

5 Measurement characteristics

5.1 Voltage measurement indication error The maximum allowable error of voltage measurement is expressed by formula (1). ΔVMPE=±a1%Vx b1( ) (1) In the formula. ΔVMPE---voltage measurement maximum allowable error, V; A1---the error coefficient associated with the reading;

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