Operation Manual

BENNING CM 5-1 02/ 2011
14

The following criteria must be met:
V
AC
, V
DC
whichever is greater
Voltage measurement active, if:
1.3 V
AC
... 750.0 V
AC
2.1 V
DC
... 999.9 V
DC
- 0.7 V
DC
… - 999.9 V
DC
Ω
Resistance/ continuity
Resistance measurement active, if
0 Ω ... ∞ Ω
0.0 V
AC
... 0.9 V
AC
- 0.4 V
DC
... - 0.2 V
DC
1.0 V
DC
... 2.0 V
DC
/
Diode
Diode test active, if:
0.4 V
DC
... 0.8 V
DC
(forward voltage)
A
AC
, A
DC
whichever is greater
Current measurement active, if:
0.9 A
AC
... 600.0 A
AC
0.9 A
DC
... 600.0 A
DC
7.2 Direct voltage ranges
The input resistance for voltages of up to 30 V is at least 4 kΩ. The input resist-
ance increases to 375 kΩ for 750 V with the input voltage increasing as well.
Measuring range Resolution Meas. precision
Overload
protection
*1
2.1 V ... 1000 V 0.1 V ± (0.3 % of the measuring value + 2 digits) 750 V
eff
- 0.7 V … - 1000 V 0.1 V ± (0.3 % of the measuring value + 2 digits) 750 V
eff
*1
Maximum measuring time = 30 seconds for voltages higher than 30 V
7.3 Alternating voltage ranges
The input resistance for voltages of up to 30 V is at least 4 kΩ. The input resist-
ance increases to 375 kΩ for 750 V with the input voltage increasing as well.
Measuring range Resolution
Meas. precision
*2
within the frequency range 50 Hz - 60 Hz
Overload
protection
*1
1.3 … 750 V 0.1 V ± (0.9 % of the measuring value + 3 digits) 750 V
eff
within the frequency range 61 Hz - 500 Hz
1.3 … 750 V 0.1 V ± (1.5 % of the measuring value + 3 digits) 750 V
eff
*1
Maximum measuring time = 30 seconds for voltages higher than 30 V
*2
The measuring value is gained and indicated as effective value (True RMS,
AC coupling). The measuring accuracy is specified for sinusoidal curves
and applies to the final value of the measuring range as well as for non-
sinusoidal curves up to 50 % of the final value of the measuring range.
In case of non-sinusoidal curves, the indicating value becomes inaccurate.
Thus, an additional error occurs for the following crest factors:
crest factor from 1.4 to 2.0 additional error + 1 %
crest factor from 2.0 to 2.5 additional error + 2.5 %
crest factor from 2.5 to 3.0 additional error + 4 %
7.4 Direct current ranges
Measuring range Resolution Meas. precision
Overload
protection
0.9 A …600.0 A 0.1 A ± (1.5 % of the measuring value + 5 digit) 600 A
eff
The indicated accuracy is specified for conductors which are gripped by means
of the measuring clamp  in the middle (see figure 3 direct/ alternating current
measurement). For conductors which are not gripped in the middle, an addi-
tional error of 1 % of the indicating value has to be considered.
Maximum remanence error: 1 % (during repeating measurement)
7.5 Alternating current ranges
Measuring range Resolution
Meas. precision
*2
within the frequency range 50 Hz - 60 Hz
Overload
protection
0.9 A …600.0 A 0.1 A ± (1.5 % of the measuring value + 5 digit) 600 A
eff
within the frequency range 61 Hz - 400 Hz
0.9 A ... 600.0 A 0.1 A ± (2 % of the measuring value + 5 digit) 600 A
eff
*2
The measuring value is gained and indicated as effective value (true RMS,
AC coupling). The measuring accuracy is specified for sinusoidal curves