Benning CM 8, Operating Manual

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02/ 2019 BENNING CM 8 14
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- The safety measuring leads mentioned above (tested accessories, 044145)
comply with CAT III 1000 V and are approved for a current of 10 A.
4. Device description
See figure 1: Device front
The display and operating elements shown in figure 1 are designated as follows:
1
Digital display , displaying measured value and range exceedance,
2
Polarity indication ,
3
Battery indication , appears in case of discharged battery,
4
Key (yellow) , display illumination,
5
Key (blue) , change-over key, measuring type
6
INRUSH/ MAX­MIN key , inrush current (AC A) detection/ storage of the
highest and lowest measuring value,
7
PEAK/ Hz­THD key , peak value storage/ frequency measurement,
8
Rotary switch , for selecting the measuring function,
9
Jack (positive
1
), for V and Ω
J
COM jack , common jack for voltage/ frequency/ resistance measurements,
diode tests and continuity tests,
K
Opening lever , for opening and closing the current clamp,
L
Bulge for current clamp , protects against contact with conductor,
M
Measuring clamp , for clamping on the single-wire live conductor,
N
HOLD/ DCA ZERO key , storage of the displayed measured value/ null bal-
ance for A DC current measurements,
1
) This is what the automatic polarity indication for DC voltage refers to
5. General information
5.1 General information on the current clamp multimeter
5.1.1 The digital display
1
is a 3
5
/
6
-digit LC display with a font size of 14 mm and
a decimal point. The highest numerical value to be displayed is 6000.
5.1.2 The polarity indication
2
works automatically. Only a polarity contrary
to the jack definition is indicated with „-“.
5.1.3 The range exceedance is indicated by „OL“ or „-OL“ and partly by an
acoustic warning.
Attention, no indication and warning in case of overload!
5.1.4 By means of the yellow key
4
, the display illumination can be activated.
It can be deactivated by pressing the key again or it is deactivated au-
tomatically after 30 seconds. By pressing the yellow key
4
for approx.
2 seconds, the battery voltage is briefly indicated in V.
5.1.5 The „HOLD/ DCA ZERO“ key
N
has two functions: By pressing the
„HOLD/ DCA ZERO“ key
N
, the measuring result can be stored. The
„HOLD“ symbol simultaneously appears on the display. By pressing the
key
N
again, the device is switched back into measuring mode. The
HOLD function is available for all measuring types.
By pressing the „HOLD/ DCA ZERO“ key
N
for approx. 2 seconds, the
device and the display indication are balanced to null in the DC A cur-
rent measuring range (rotary switch
8
and blue key
5
, if necessary).
5.1.6 The „INRUSH/ MAX-MIN“ key
6
has two functions: In measuring type
„AC A“ (rotary switch
8
and blue key
5
, if necessary), the measuring
mode „INRUSH Current“ is activated by pressing the key
6
. Here, the
measuring process is initiated for 100 milliseconds after a current is
applied. The averaged value of this time period is displayed. The MAX-
MIN function is started by pressing the „INRUSH/ MAX-MIN“ key for
approx. 2 seconds.
By means of the MAX-MIN key function
6
, the highest and the lowest
measured value is stored automatically. By pressing the key, the follow-
ing values are displayed:
„MAX“ displays the highest value stored and „MIN“ displays the lowest
value. The continuous detection of the MAX-MIN value can be stopped
or started by pressing the „HOLD“ key
N
. By pressing the „MAX-MIN“
key for approx. 2 seconds, the instrument is switched back to normal
operating mode.
The MAX-MIN function is available for all measuring types. When using
the MAX-MIN function, the
APO
(
A
uto-
P
ower-
O
ff) function is deacti-
vated.
5.1.7 The „PEAK/ HZ-THD“ key
7
has three functions:
In V AC and A AC measuring type (rotary switch
8
and blue key
5
, if
necessary), the peak value storage is activated by pressing this key.
Here, the positive and the negative peak / crest value are detected and
displayed. By pressing the key
7
, the values of „Peak Max“ or „Peak
Min“ are displayed. The continuous detection of the peak value storage
can be stopped or started by pressing the „HOLD“ key
N
. By pressing
the key for approx. 2 seconds, the instrument is switched back to nor-