JJG 166-2022 DC Standard Resistors

Scope

This procedure applies to the initial verification, subsequent verification, and in-use inspection of the following DC standard resistors with a working voltage not exceeding 1 kV:
Resistance working reference devices (sets), including a reference device with a nominal value of 1 Ω and a reference set consisting of 8 resistance reference devices with nominal values of 10-3Ω, 10-2Ω, 10-1Ω, 10 Ω, 102Ω, 103Ω, 104Ω, and 105Ω;
First-class resistance standard devices, including 11 resistance standard devices with nominal values of 10-3Ω, 10-2Ω, 10-1Ω, 1 Ω, 10 Ω, 102Ω, 103Ω, 104Ω, 105Ω, 106Ω, 107Ω, and 108Ω;
Second-class resistance standard devices, including 13 resistance standard devices with nominal values of 10-3Ω, 10-2Ω, 10-1Ω, 1 Ω, 10 Ω, 102Ω, 103Ω, 104Ω, 105Ω, 106Ω, 107Ω, 108Ω, and 109Ω;
0000 5-grade and lower-grade resistance working metrological instruments, including 19 devices with nominal values of 10-4Ω, 10-3Ω, 10-2Ω, 10-1Ω, 1 Ω, 10 Ω, 102Ω, 103Ω, 104Ω, 105Ω, 106Ω, 107Ω, 108Ω, 109Ω, 1010Ω, 1011Ω, 1012Ω, 1013Ω, and 1014Ω.
Except for the single-value standard resistors with the above-mentioned values, this procedure can be referred to for implementation.
This procedure does not apply to:
a) Single-value or multi-value resistors and ten-progress resistors with a single disk or multiple disks, such as Hamon measuring instruments, DC resistance boxes, voltage dividers, shunt resistors, etc., which are only used as electric quantity ratio devices;
b) Resistors that are only used as permanent installation elements in circuits or resistors that are only used for adjustment purposes;
c) Resistors used in AC or pulse circuits;
d) Series or parallel resistors that can only be used as accessories for electrical measuring instruments and cannot be used independently;
e) Active resistors;
f) High-value resistors with a working voltage greater than 1 kV.

Development Information

Replace the following standards

Referenced Standards

Related Standards