11/ 2008
BENNING CM 9
9
O
HOLD/PEAK
, is intended for switching the BENNING CM 9 ON/ OFF and
for activating individual "HOLD" functions,
P
Bulge of current probe
, protects against contact with conductor.
5.
General information
5.1
General details on the clamp meter
5.1.1 The digital display
3
is a 3
5
/
6
-digit liquid crystal display with 12 mm high
numerals, complete with decimal point. The largest numerical value
which can be displayed is 6000.
5.1.2 The over ranging is indicated by “0L”. Warning, no indication and prior
warning in the event of an overload condition!
5.1.3 The BENNING CM 9 is switched on or off by pressing the key
O
. To
switch it off, press and hold the key for approx. 5 seconds.
5.1.4 RANGE, the "RANGE“ key
M
can be used to change over to the individ-
ual measuring ranges (6 mA, 60 mA, 600 mA, 6 A, 60 A, 100 A). Press
and hold (approx. 2 sec.) the "RANGE“ key
M
to activate "AutoRange".
"AutoRange"
6
is shown on the display
3
.
5.1.5 Hold, the currently measured value will be stored by means of the
"HOLD" function. For storage, briefly press the "HOLD/PEAK“ key
O
. If
the measured value is exceeded by 50 measuring steps, the display will
start flashing and an acoustic signal will be emitted additionally.
5.1.6 PeakHold, this function continuously stores the maximum measured
value determined. Press and hold the "HOLD/PEAK" key
O
for approx.
2 seconds to activate the continuous peak value storage. If the "Peak/
Hold" function is activated, the BENNING CM 9 will change over to the
manual range mode.
5.1.7 AutoHold, if the measured value does not change within 10 measuring
cycles, this measured value will be stored and "AutoHold"
K
will be
shown on the display. Measurement is made continuously. If the meas-
ured value changes, "AutoHold"
K
will disappear from the display and
an acoustic signal will be emitted.
To activate the "AutoHold" function, the BENNING CM 9 must be
switched off (see figure 8). Press the "HOLD/PEAK“ key
O
and hold it
for approx. 5 seconds. On the display, the "AutoHold" indication
K
will
flash three times and two acoustic signals will be emitted in intervals of
approx. 1 second. Now, the "AutoHold" function is activated. To activate
the "AutoHold" function, switch the BENNING CM 9 off and switch it on
again by briefly pressing the "HOLD/PEAK" key
O
.
5.1.8 The “Wide/50-60Hz, Compare“ key
N
has two functions:
The low-pass filter can be activated in manual measuring range selec-
tion only. Interfering signals are attenuated starting at a limit frequency
of 100 Hz with -24 dB/octave. Briefly press the “Wide/50-60Hz/Com-
pare“ key
N
to activate the low-pass filter (50 Hz - 100 Hz). An active
filter is visualized by the “50-60 Hz“ symbol
8
.
Press the “Wide/50-60Hz/Compare“ key
N
for approx. 3 seconds to
activate the comparator function. “Compare“
9
appears on the digital
display
3
. The leakage current clamp supplies 3 stored limiting values:
0.25 mA, 0.5 mA and 3.5 mA. The comparative function allows verify-
ing directly whether the limiting values have been exceeded. The inter-
nal buzzer sounds and the digital display
3
flashes, of the measured
values exceeds the limiting value. Press and hold the “Wide/50-60Hz,
Compare“ key
N
for more than 1 second to first indicate the selected
limiting value (the indication flashes). Use the “RANGE“ key
M
to
scroll through the limiting values. Confirm the selection by pressing the
“Wide/50-60Hz, Compare“ key
N
again. Now, the comparative function
is set and active.
5.1.9 The BENNING CM 9 switches off automatically after approx. 20 min-
utes (
APO
,
A
uto-
P
ower-
O
ff). It switches back on again by pressing the
key
O
. A buzzer tone signals automatic switch off of the appliance. The
automatic switch off can be deactivated by pressing the key
O
for more
than 3 seconds when switching on.
5.1.10 The measuring rate of the BENNING CM 9 amounts nominally to 5
measurements per second for the digital display.
5.1.11 The brightness sensor is located behind the “AUTO BACKLIT“ window
7
. As soon as the ambient lighting decreases, the background lighting
will switch on.
5.1.12 Temperature coefficient of the measured value: 0.2 x (stated measuring
precision)/ °C < 18 °C or > 28 °C, related to the value for the reference
temperature of 23 °C.
5.1.13 The BENNING CM 9 is supplied by two 1.5 V micro batteries/ type AAA
(IEC LR 03).
5.1.14 If the battery voltage drops below the specified operating voltage of
the BENNING CM 9, then a battery symbol appears in the display. To
