16
The rack cases with internal power supply Models
M68B6 and M68B12 supply the plugged-in modules
via a backplane. They can be operated with both 115
VAC and 230 VAC without changing any settings.
Replacing
the fuse
The fuse holder of the rack cases M68B6 and M68B12
with mains power supply is located inside the mains
socket at the rear. It can be pulled out using a screw
driver. The fuse facing to the back of the drawer is a
spare fuse. The rear one is the mains fuse.
)
)
)
)
Important: Unplug the device from the mains voltage
before replacing the fuse.
Make sure that the fuse to be replaced has the rating
T 800 mA.
3. Technical Data
Measuring inputs
Charge and ICP
compatible, R
I
> 5 M
Ω
BNC socket, single-ended
ICP
sensor supply
3.8 .. 5.6 mA constant current,
compliance voltage 24 V,
switched off by internal jumper,
LED indicator
Gain
0.1 / 1 / 10 / 100 / 1000 mV/pC (charge)
1 / 10 / 100 / 1000 (ICP)
Accuracy
±
1 % typical
±
2 % maximum
Low pass filter (-3 dB)
0.1 / 0.3 / 1 / 10 / 20 / 50 kHz, two poles, 40 dB/decade
High pass filter (-3 dB)
3 Hz, two poles, 40 dB/decade, can be switched off
Frequency range
of integrators
Single integration:
3 .. 1000 Hz
Double integration:
3 .. 100 Hz
Output
±
10 V
PEAK
, DC coupled, DC offset < 10 mV,
R
OUT
= 50
Ω
, BNC socket, single-ended
Cross-talk attenuation
> 60 dB (M68D3 at 1 kHz / V=1000)
Output noise
< 10 mV
RMS
(50 kHz bandwidth),
< 6 mV
RMS
(20 kHz bandwidth)
LED indicators
Minimum modulation: > 0.7 V
PEAK
Overload: > 90 % of full-scale output
Battery: supply voltage > 5 V
