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68 IFS 125M User Manual Bruker Optik GmbH
Maintenance 6
6.1.1 Electrostatic discharge
Electronic components (e.g. semiconductor chips, printed circuit boards) are very sus-
ceptible to electrostatic discharges. Even discharge which may not be perceptible to the
operator can damage electronic components. Therefore, it is important that the operator
is grounded to the spectrometer housing before any electronic component is touched
inside the spectrometer.
Electrical grounding can be accomplished by using a grounding wrist strap (not supplied)
or touching a grounded object (e.g. radiator). The grounding wrist strap is the most effec-
tive and preferred grounding method.
6.2 Checking laser signal
To reliably scan and correctly determine the optical path difference it is very important to
have proper laser signals at laser A and laser B detectors. The signals should be
checked once a month.
6.2.1 Amplitude
i
The amplitude of the two modulated signals must be in the range between 2 V
pp
to
18 V
pp
. In addition, the absolute value of both signals must be in the range +/-10.0 V
DC
.
Any signal above or below will be distorted or clipped, leading to wrong detection of the
laser zero crossings. When severely clipped, two or more zero crossings may be
detected and scanning becomes impossible.