HT instruments М75 - Manual (Page 43)

M72 - M73 - M74 - M75
EN - 41
M : Insulation resistance 250, 500VDC (M72, M74, M75)
Range Resolution Accuracy Overload protection
0.00  19.99M 0.01M (5.0% rdg + 2 dgt)
605V max RMS 20.0  199.9M 0.1M (5.0% rdg + 2 dgt)
200  999M(*) 1M (10.0% rdg + 2 dgt)
(*) For 500VDC test voltage. For 250VDC test voltage the range is: 200  499M
Autorange
Open circuit voltage: <1.3 x V
0
Accuracy of nominal voltage: –0% +10%
Short circuit current: <3.0mA
Nominal testing current: 1mA @ 1K
 x V (1mA @ 500K)
RCD: test on RCD devices AC type (M73, M74, M75)
Range Resolution Accuracy Overload protection
2  400ms 1ms (2.0% rdg + 2 dgt) 605V max RMS
Phase to ground voltage: 110  265V
Test currents: 30mA, 30mA x 5, 100mA, 300mA
Frequency: 50Hz
 0.5Hz / 60Hz  0.5Hz
Ra : Measurement of global earth resistance (M73, M74, M75)
Test current Range Resolution Accuracy Overload protection
15mA 1  1999 1  (5% rdg + 2 dgt)
605V max RMS
100mA 0.1  199.9 0.1 (5% rdg + 3 dgt)
Phase to ground voltage: 110  265V; Frequency: 50Hz  0.5Hz / 60Hz  0.5Hz
Nominal voltage used for the calculation of the prospective short circuit current: 127V if 100V ≤ V
measured
< 150V
230V if 150V ≤ V
measured
< 265V
Wire mapping (M75)
Length of the cable: 1 100m
Number of remote units: max 8 units
Detected errors: OPEN Pairs, REVERSED pairs, SHORT pairs, SPLIT pairs, CROSSED pairs, MISWIRING
According to the norm: TIA568B
CAUTION
In all measurements the instrument dispalys the symbol when:
 The instrument is operating in a critical situation as for example in
presence of overvoltages.
 The instrument cannot guarantee the measuring uncertainty lower than
30% of the reading, according to IEC/EN61557-1.