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Benning CFlex 2 Manual

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07/ 2014
BENNING CFlex 2
8
lowest measured value. By pressing the key, the following values are displayed: “MAX”
shows the highest value stored, “MIN” shows the lowest value stored and “MIN/MAX”
shows the current measured value. Press the key for approx. 2 seconds to switch the
device back to normal operating mode.
5.1.6 The illumination key
6
activates the illumination of the display
7
. It is switched off by
pressing the key again or automatically after approx. 30 seconds.
5.1.7 The measuring rate of the BENNING CFlex 2 amounts nominally to 2 measurements
per second for the digital display.
5.1.8 The BENNING CFlex 2 is switched on and off with the rotary switch
. Shutdown posi-
tion “OFF”.
5.1.9 The BENNING CFlex 2 switches off automatically after approx. 15 minutes (APO,
Auto-Power-Off is activated, if the symbol is shown on the display
7
). It switches
on again, if the HOLD key
or another key is actuated. Automatic switch-off can be
deactivated by pressing the HOLD key
and by simultaneously switching on the
BENNING CFlex 2 from the switching position “OFF”. The symbol disappears from
the display
7
.
5.1.10 The BENNING CFlex 2 is supplied by two 1.5 V batteries (IEC LR03/ AAA/ micro).
5.1.11 If the battery voltage drops below the specified operating voltage of the
BENNING CFlex 2, then a battery symbol appears in the display
7
.
5.1.12 The battery life is approx. 120 hours (alkaline battery).
5.1.13 Temperature coefficient of the measured value:
0.1 x (stated measuring accuracy)/ °C < 18 °C or > 28 °C, related to the value for the
reference temperature of 23 °C
5.1.14 Length of the measuring loop: approx. 46 cm
5.1.15 Cable diameter of the measuring loop: approx. 8.5 mm
5.1.16 Cable length from measuring loop to housing: approx. 1.8 m
5.1.17 Housing dimensions: (L x W x H) = 120 x 70 x 26 mm
5.1.18 Weight of the device: 286 g
6. Ambient conditions
- The BENNING CFlex 2 is intended for making measurements in dry environment.
- Maximum barometric elevation for making measurements: 2000 m,
- Overvoltage category: IEC 60664/ IEC 61010 → 600 V category IV, 1000 V category III
- Contamination class: 2 (EN 61010-1),
- Protection class: IP 30 (DIN VDE 0470-1, IEC/ EN 60529)
IP 30 means: Protection against access to dangerous parts and protection against solid
impurities of a diameter > 2.5 mm, (3 - first index). No protection against water, (0 - second
index).
- Operating temperature and relative humidity:
For operating temperatures from 0 °C to 50 °C: relative air humidity lower than 80 %, non-
condensing
- Storage temperature: The BENNING CFlex 2 can be stored at temperatures between - 10
°C and + 60 °C, at a relative air humidity lower than 70 % without batteries.
7. Electrical specifications
Note: The measuring precision is specified as the sum of
- a relative fraction of the measured value and
- a number of digits (counting steps of the least significant digit).
This specified measuring precision is valid for temperatures in the range from 23 °C ± 5 °C and
relative humidity less than 80 %.
7.1 Alternating current ranges
The measured value is obtained and displayed as real r.m.s. value (True RMS, AC coupling).
Its calibration is adapted to sinusoidal curves. In case of deviations from this curve shape, the
accuracy of the displayed value decreases.
Crest factor < 1.6 up to 100 % of the final measuring range value
Crest factor < 3.2 up to 50 % of the final measuring range value
Measuring Range Resolution
Meas. precision* within
the frequency range 45 Hz - 500 Hz protection
Overload
30 A 10 mA ± (3.0 % of the measuring value + 5 digit) 3000 A
300 A 100 mA ± (3.0 % of the measuring value + 5 digit) 3000 A
3000 A 1 A ± (3.0 % of the measuring value + 5 digit) 3000 A
* The measuring accuracy is specified for a sinusoidal curve. The stated accuracy is specified
for conductors that are centrally clamped by means of the measuring loop
(see figure 3).
For conductors that are not centrally clamped, an additional error has to be considered.
… 12 …


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