10
Digital Ground Resistance Tester Model 4500
Charging Time:
14 hours typical
Charging Supply Voltage:
Internally selectable 110/220V, 45 to 450Hz
Low Battery Indication:
Battery can be recharged with built-in dual volt-
age charging unit: 94 to 127V or 187 to 253V (47 to 450Hz).
WARNING:
Do not fully discharge batteries.
Fuse Protection:
250Vrms (measurement circuit) via 3.15A 250V fuse
3.2 Accuracy
Range
Resolution
Test
Current
Accuracy
in % of
Reading
* Maximum Value of
Y and Z Electrodes
Having Influence < 1%
Ry
Rz
2
Ω
2 mA
± 5m
Ω
± 1ct
± 2% ± 1ct
± 2% ± 1ct
of 10% to 100%
of full scale
5k
Ω
10k
Ω
± 2% ± 30m
Ω
± 1ct
± 2% ± 3m
Ω
± 1ct
0 to
0.2
Ω
0.2
Ω
to 2
Ω
1m
Ω
1m
Ω
10m
Ω
0.1
Ω
1
Ω
10
Ω
20k
Ω
2k
Ω
200
Ω
20
Ω
600
Ω
to 20k
Ω
to be
selected
in relation
to the test
current
10mA
50mA
2mA
10mA
50mA
2mA
10mA
50mA
2mA
10mA
50mA
2mA
10mA
50mA*
2mA*
10mA*
50mA*
No accuracy specification - do not use
* See Table III for maximum auxiliary resistance
5k
Ω
5k
Ω
