ELTRA CS-2000, Service Manual

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Faults
12
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3 Faults
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3.1 Check base lines
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When this message appears on the PC screen, at least one of the base lines is either over
+9.5Volts or below -9.5 Volts.
In order to read the base line voltages of all IR cells available, click on “base lines”
Fig. 1: Base line button
A window appears at the right upper end of the screen showing the base lines moving from the
left to the right (time coordinate). In the middle of the right end of this base lines window, there
is a small button. After clicking on it, a new window appears, displaying the base line voltages,
described as “Inputs” and their “Averages”.
The description “Inputs” is made from the software point of view. The outputs of the cells are
inputs for the microcontroller board and for the software.
It is advisable to watch the figures under “Inputs”. Do not observe the “Averages” because the
response is delayed when the base lines change. This is a disadvantage when adjusting the
base lines.
Fig. 2: : Activating Inputs and Averages Window
Fig. 3: Inputs and Averages Window
If any of the “Inputs” or “Averages” is over 9.5V, adjust a voltage of about 6 to 7V.
See chapter 3.2
“
Infrared base line adjustment
”.
The adjustment is preferably made when having carrier gas flow through the cells.