Table Of Influencing Parameters - AEMC 4500 User Manual

3.3

Table of Influencing Parameters

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
1. For the 2Ω range (2mA and 10mA test currents), maximum Ry is
5kΩ. Influence 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
Digital Ground Resistance Tester Model 4500
Reference Operating
Conditions Conditions
12V ±0.2V 11 to 14V DC
73˚F ±37˚F 23˚F to 122˚F
23˚C ±3˚C -5˚C to 50˚C
Ry = 0 0 to 50kΩ
Rz = 0 See Table 3
N/A 0 to 20V DC
N/A
Typical
0.2% /volt
±0.5% /50˚F
±0.5% /10˚C
(1)
0.5% /10kΩ
2mA: 0.1%/10kΩ
10mA: 0.1%/3kΩ
50mA: 0.1%/1kΩ
(2)
See Table 3
Table 1
% of Measurement
Maximum
0.3% /volt
(3)
±1% /50˚F
±1% /10˚C
(1)
1% /10kΩ
2mA: 0.3%/10kΩ
10mA: 0.3%/3kΩ
50mA: 0.3%/1kΩ
or 5 cts
N/A
(3)
(1)
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