Ambient Conditions; Electrical Specifications - Benning CM 8 Instrucciones De Servicio

mal operating mode. By pressing the „Peak/ Hz-THD" key for approx. 2
seconds in the same meausring type (V AC and A AC), the instrument is
switched to the frequency measuring mode.
By pressing the key again, the device is switched to the %THD mode
(%harmonic distortion). By pressing the key for approx. 2 seconds, the
instrument is switched back to normal operating mode. The measuring
mode „%THD" gives the information in % of the ratio of the effective
values of the harmonic waves to the total of fundamental and harmonic
waves (distortion factor or THD-R). The fundamental wave may range
between 45 Hz...65 Hz (V AC or A AC).
5.1.8 Special functions: By pressing a certain key and switching on the rotary
switch 8 at the same time from OFF position, the following functions or
information can be obtained (release the key approx. 2 seconds after
rotating the switch):
PEAK key 7:
INRUSH key 6: Displaying the software version.
HOLD key N:
5.1.9 Buzzer: The signal sounds once for each valid actuation of a key and
twice for each inadmissible actuation of a key (e.g. if functions cannot
be used for certain measuring types).
5.1.10 The nominal measuring rate of the BENNING CM 8 is 3 measurements
per seconds for the digital display.
5.1.11 The BENNING CM 8 is switched on or off by means of the rotary switch
8. Switch-off position „OFF".
5.1.12 The BENNING CM 8 is switched off automatically after approx. 10 min-
utes (APO, Auto-Power-Off). It is switched on again, if a key or the rota-
ry switch is actuated. A buzzer sound indicates the automatic switch-off
of the device. Automatic switch-off can be deactivated by pressing the
„PEAK" key and by simultaneously switching on the BENNING CM 8
from the switching position „OFF".
5.1.13 Temperature coefficient of the measured value: 0.2 x (stated measuring
accuracy)/ °C < 18 °C or > 28 °C, related to the value for the reference
temperature of 23 °C.
5.1.14 The BENNING CM 8 is supplied by means of a 9 V block battery
(IEC 6 LR 61).
5.1.15 If the battery voltage falls below the specified operating voltage (7 V) of
the BENNING CM 8, a battery symbol appears on the display.
5.1.16 The battery life is approx. 50 hours (alkaline battery).
5.1.17 Dimensions of the BENNING CM 8:
(L x W x H) = 235 x 85 x 51 mm
Weight: 380 g
5.1.18 The enclosed safety measuring leads are explicitly intended for the
nominal voltage and the nominal current of the BENNING CM 8.
5.1.19 Largest clamp opening: 40 mm
5.1.20 Largest cable diameter: 35 mm
6.

Ambient conditions

- The BENNING CM 8 is intended for measurements under dry ambient con-
ditions,
- Maximum barometric height for measurements: 2000 m,
- Overvoltage category / installation category: IEC 60664-1/ IEC 61010-1 →
600 V category III
- Contamination class: 2,
- Protection category: IP 30 (DIN VDE 0470-1 IEC/ EN 60529)
3 – first index: protection against access to dangerous parts and protection
against solid impurities of a diameter > 2.5 mm
0 – second index: no protection against water
- Operating temperature and relative air humidity:
For operating temperatures from 0 °C to 30 °C: relative air humidity lower
than 80 %,
For operating temperatures from 31 °C to 40 °C: relative air humidity lower
than 75 %,
For operating temperatures from 41 °C to 50 °C: relative air humidity lower
than 45 %,
- Storage temperature: The BENNING CM 8 can be stored at temperatures
between - 20 °C and + 60 °C (air humidity 0 to 80 %). During storage, the
battery should be removed.
7.

Electrical specifications

Note: The measuring accuracy is specified as the sum of:
- a relative part of the measured value and
02/ 2019
Cancelling the APO function. The automatic battery
switch-off is deactivated.
Displays all LCD symbols/ segments for approx.
10 seconds.
BENNING CM 8
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