Under the specified working conditions of the tested instrument, the standard AC resistance box is used as the standard when detecting the basic error of Class A grounding resistance tester, and the standard AC resistance box, standard inductance, standard capacitance, or standard impedance are used as the standard when detecting the basic error of Class B grounding resistance tester. The error limit value of the standard should not exceed 1/4 of the basic error limit value specified by the accuracy level of the grounding resistance tester
1. Error detection point selection
Analog grounding resistance tester detects at each graduation line with graduation numbers within the measurement range.
The digital grounding resistance tester uniformly selects 10 test values (including the upper and lower limits of the measurement range or values near them) within its effective measurement range for testing The grounding resistance tester with both analog and digital displays is tested at the dividing line detected by the analog grounding resistance tester
2. Error detection method
Connect the standard device and equivalent auxiliary grounding resistance to the grounding resistance tester as shown in Figure 1 (three terminal grounding resistance tester) or Figure 2 (four terminal grounding resistance tester) E - grounding body terminal; P - voltage (potential) pole terminal; C - Current pole terminal RE - standard device (equivalent grounding resistance); RC, RP - Equivalent auxiliary grounding resistance
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