BENNING CM 5-1
02/ 2011
15
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 %
The stated precision is specified for conductors that are centrally clamped by
the current clamp
(see fig. 3 direct/ alternating current measurement). For
conductors that are not centrally clamped, an additional error of 1 % of the
display value needs to be taken into account.
7.6 Resistance measuring range and acoustic continuity testing
Overload protection: AC 750 V
eff
/ DC 1000 V
Measuring range Resolution
Meas. accuracy
Max. idling voltage
0 Ω ... 999 Ω
1 Ω
± (0.9 % of the measuring value + 2 digits)
1.8 V
The built-in buzzer sounds in the case of a resistance R less than 25 Ω up to
400 Ω. For a resistance R higher than 400 Ω (specified for temperatures of 0 °C
up to 40 °C), the buzzer does not emit an acoustic signal.
7.7 Diode testing
Overload protection: AC 750 V
eff
/ DC 1000 V
Measuring range Resolution
Meas. accuracy
Max. idling voltage
0.4 V … 0.8 V
0.1 V
± (0.9 % of the measuring value + 2 digits)
1.8 V
8. Measuring with the BENNING CM 5-1
8.1 Preparations for measuring
Operate and store the BENNING CM 5-1 only at the specified storage and
operating temperatures conditions. Avoid continuous insulation.
- Check rated voltage and rated current details specified on the safety meas-
uring leads. The nominal voltage and current ratings of the safety measur-
ing leads included in the scope of delivery correspond to the ratings of the
BENNING CM 5-1.
- Check the insulation of the safety measuring leads. Discard the safety
measuring leads immediately if the insulation is damaged.
- Check safety measuring leads for continuity. If the conductor in the safety
measuring lead is interrupted, the safety measuring lead must be dispose
of immediately.
- Strong sources of interference in the vicinity of the BENNING CM 5-1 can
lead to unstable readings and measuring errors.
- It is only possible to make measurements, if the conditions of the
AUTOTEST function are met (see section 7.1 „Priority of the AUTOTEST
function“).
Note:
Clocked signals, e.g. currents generated by chargers, might result in an incor-
rect AC/ DC indication.
8.2 Voltage measuring
Do not exceed the maximum permitted voltage with respect to
earth potential! Electrical danger!
The highest voltage which may be applied to the jacks,
- COM socket
K
- jack for V, Ω and
L
of the BENNING CM 5-1 against ground, amounts to 600 V CAT IV/ 1000 V
CAT III.
- Switch the BENNING CM 5-1 on by means of the key (grey)
J
.
- The black safety measuring lead has to be contacted with the COM jack
K
on the BENNING CM 5-1.
- The red safety measuring lead has to be connected to the jack for V, Ω and
L
on the BENNING CM 5-1.
- Bring the safety measuring leads into contact with the measuring points.
- On the digital display
, the AUTOTEST function is shown by the
„AutoSense“ symbol
4
. It automatically determines the required measuring
function (voltage) and the ideal measuring range.
- Read the measured value on the digital display
on the BENNING CM 5-1.
