AEMC 4500 - Table Of Influencing Parameters

Digital Ground Resistance Tester Model 4500 11
3.3 Table of Influencing Parameters
Supply Voltage
Temperature
Auxiliary
Electrode
Resistance (Ry)
Influence of
Auxiliary
Electrode
Resistance (Rz)
in Relation to
Test Current
DC Voltage in
Series with Rx
AC 60 Hz Stray
Voltage Influence
in Series with
Rx, Ry or Rz
Reference
Conditions
12V ±0.2V 11 to 14V DC
73˚F ±37˚F23˚F to 122˚F
23˚C ±3˚C -5˚C to 50˚C
±0.5%/50˚F
(3)
±0.5%/10˚C
0.2%/volt 0.3%/volt
±1%/50˚F
(3)
Ry = 00 to 50kΩ
(1)
N/A
N/A See Table 3
N/A0 to 20V DC
(2)
Rz = 0 See Table 3
0.5% /10kΩ
(1)
2mA: 0.1%/10kΩ
10mA: 0.1%/3kΩ
50mA: 0.1%/1kΩ
2mA: 0.3%/10kΩ
10mA: 0.3%/3kΩ
50mA: 0.3%/1kΩ
or 5 cts
1% /10kΩ
(1)
±1%/10˚C
Operating
Conditions
% of Measurement
Typical Maximum
Parameters
Table 1
1. For the 2Ω range (2mA and 10mA test currents), maximum Ry is
5kΩ. Inuence will typically be 0.5%/ 5kΩ, with a maximum of 1%
max/5kΩ or 3cts.
2. Presenceof DCvoltage maytendtolimitthemaximum(Rx +Rz)
level indicated within Table 3.
3. From 10% to 100% of measuring scale interval. It is necessary to add
the following quantities to those indicated with Table 1:
± 10mΩ for 2Ω/2mA range
± 3mΩ for 2Ω/10mA range
± 1 count for other ranges