Ground Resistance Tester Model 6471
17
External Voltage Measurements
Measuring Method:
Digital by sampling at 4028Hz, low pass filter, FFT.
The frequency of the strongest spectral component is displayed.
Measuring Rate:
Display updates approx. 3 times per s.
Signal Conversion:
TRMS or sum of all harmonics 10 to 450Hz during selective
earth measurements with a clamp.
Measured Range
0.00 to 9.99V
10 to 65V
Resolution
0.01V
0.1V
Intrinsic error
± (2% + 1ct)
Operating error
± (5% + 1ct)
Input impedance Z
H-E
, Z
S-E
(Z
S-ES
)
1.2M
Ω
Operating frequency
DC and 15 to 440Hz
3.2.3 Current Measurements
External Current Measurements
Measuring Method:
Digital by sampling at 4028Hz, low pass filter, FFT.
Measuring Rate:
Display updates approx. 3 times per s.
Signal Conversion:
Sum of all harmonics 10 to 450Hz
With Current Probe SR182
Measurement Range
0.00 to
9.99mA
10.0 to
99.9mA
100 to
999mA
1.00 to
9.99A
10 to
40A
Resolution
0.01mA
0.1mA
1mA
0.01A
0.1A
Frequency range
16 to 49Hz
50 to 99Hz
100 to 400Hz
Operating error from
0.5 to 100mA
± (10% + 2cts)
± (5% + 2cts)
± (3% + 2cts)
Operating error from
0.1 to 40.0A
> 20%
± (10% + 2cts)
± (5% + 2cts)
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