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Earth/Ground Tester
Specifications
13
Measurement of Interference Voltage DC + AC (U
ST
)
Measuring method: fullwave rectification
Measuring
Range
Display
Range
Resolu-
tion
Frequency
Range
Limits of Er-
ror
1…50 V 0.0…50 V 0.1 V DC/AC
45…400 Hz
sine
± (5% of
reading +5
digit)
Measuring sequence: approx. 4 measurements /s
Internal resistance:
approx. 1.5 MΩ
Max. overload:
U
rms
= 250 V
Measurement of Interference Frequency (F
ST
)
Measuring method: Measurement of oscillation period of the interfer-
ence voltage
Measuring
Range
Display Range Resolution Range
Limits of
Error
16.0 … 400
Hz
16.0…299.9…99
9 Hz
0.1 … 1 Hz 1 V …
50 V
± (1% v. mv
+2 digit)
Earthing Resistance (R
E
)
Measuring method: current and voltage measurement with probe
as IEC61557-5
Open circuit voltage: 20 / 48 V, AC
Short circuit current: 250 mA AC
Measuring frequency: 94 , 105 , 111 , 128 Hz selected manually or
automatic.(AFC) 55 Hz in function R*
Noise rejection: 120 dB ( 16 2/3, 50 , 60, 400 Hz )
Max. overload: U
rms
= 250 V