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Model T101 Instruction Manual Troubleshooting & Service
217
9.1.3. USING THE DIAGNOSTIC SIGNAL I/O FUNCTION
The signal I/O parameters found under the diagnostics (DIAG) menu combined with a
thorough understanding of the instrument’s theory of operation (Section 10) are useful
for troubleshooting in th
ree ways:
The technician can view the raw, unprocessed signal level of the
analyzer’s critical inputs and outputs.
All of the components and functions that are normally under instrument
control can be manually changed.
Analog and digital output signals can be manually controlled.
This allows the user to systematically observe the effect of these functions on the
operation of the analyzer.
Figure 9-2 shows an example of how to use the signal I/O menu to view the raw voltage
of an input signal or to control the state of an output voltage or control signal. The
specific parameter will vary depending on the situation. Please note that the analyzer
will freeze it’s concentration output while in the diagnostic signal I/O menu. This is
because manually changing I/O outputs can invalidate the instrument reading.
07266B DCN6485