Teledyne T200, Operation Manual, Page: 235 / 425

Teledyne API
– T200 NO/NO
2
/NO
X
Analyzer Operation Manual Troubleshooting & Service
233
TEST FUNCTION INDICATED FAILURE(S)
overpressure
NOX SLOPE
HVPS out of range; low-level (hardware) calibration needs adjustment; span gas
concentration incorrect; leaks
NOX OFFset
Incorrect span gas concentration; low-level calibration off
NO SLOPE
HVPS out of range; low-level calibration off; span gas concentration incorrect; leaks
NO OFFSet
Incorrect span gas concentration; low-level calibration off
TIME
Internal clock drifting; move across time zones; daylight savings time?
12.1.3. DIAG

SIGNAL I/O: USING THE DIAGNOSTIC SIGNAL I/O
FUNCTION
The signal I/O diagnostic mode allows access to the digital and analog I/O in the
analyzer. Some of the digital signals can be controlled through the touchscreen. These
signals, combined with a thorough understanding of the instrument‟s principles of
operation (Section 13), are useful for troubleshooting in three ways:

The technician can view the raw, unprocessed signal level of the analyzer’s critical
inputs and outputs.

Many of the components and functions that are normally under algorithmic control
of the CPU can be manually exercised.

The technician can directly control the signal level Analog and Digital Output
signals.
This allows the technician to observe systematically the effect of directly controlling
these signals on the operation of the analyzer. Following is 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.
06858E DCN7057