AEMC 4500 - Influence Of Stray Voltage; Influence Of Auxiliary Resistances

12 Digital Ground Resistance Tester Model 4500
3.4 Influence of Stray Voltage
2 20 200 2 k 20 k
2 mA
10 mA
50 mA
ΩΩ Range
Test
Current
Table 2
Shaded areas indicate the ranges in which measurements can be
performed, where 40V, 50/60Hz peak-to-peak stray voltage is present,
without obtaining error levels representing more than 0.5% of the
measurement range.
3.5 Influence of Auxiliary Resistances
Intheabsenceofstraysignals,themaximumvaluesfor(Rx+Rz)whichwill
allow measurements to be performed, are those indicated within Table 3.
Range
Current
50 mA
10 mA
2 mA
(*)
Rx + Rz = 600Ω max
Rx + Rz = 4000Ω max
Rx + Rz = 20 kΩ max
2 Ω 20 Ω 200 Ω 2 k
Ω
20 k Ω
(*)
(*)
Do not use
Table 3
*EvenifauxiliaryresistanceofRz=0,themaximumreadingis<2000-countsonthesethree
ranges(voltagelimitingcircuitatoutputterminals).