Teledyne 9110AH - Nitrogen oxides analyzer User Manual
Page 127
TELEDYNE Model 9110AH NO
X
Analyzer Operator Manual, 01620, Rev. F
9-11
Table 9-3: Summary of Diagnostic Modes
DIAG Mode
Description
SIGNAL I/O
Gives access to the digital and analog inputs and outputs on the
V/F board. The status or value of all of the signals can be seen.
Some of the signals can be controlled from the keyboard. Table
9-4 gives details on each signal and information on control
capabilities.
NOTE:
Some signals can be toggled into states that indicate warnings or
other faults. These settings will remain in effect until DIAG
mode is exited, then the M9110AH will resume control over the
signals.
ANALOG OUTPUT
Causes a test signal to be written to the analog output DAC's.
The signal consists of a scrolling 0%, 20%, 40%, 60%, 80%,
100% of the analog output value. The scrolling may be stopped
by pressing the key underneath the % display to hold the
displayed value. The exact voltage values depend on the jumper
settings on the analog output buffer amplifiers on the V/F card.
DAC CALIBRATION
The analog output is created by 4 digital-to-analog converters
located on the V/F card. This selection starts a procedure to
calibrate these outputs. Refer to Section 9.3.3.1 for a detailed
procedure.
TEST CHANNEL
Using the test channel, it is possible to route some of the internal
analog signals out of the 4th analog output port. This Diagnostic
mode is useful for intermittent problems, since the signal can be
captured on a strip chart recorder and examined for periods of
fault conditions.
OPTICAL TEST
Sets the M9110AH into a known state and turns on an LED near
the PMT to test the instrument signal path. See Section 9.3.3.1
for details on using this test.
ELECTRICAL TEST
Tests just the electronic portion of the PMT signal path. Used in
conjunction with optic test, see Section 9.1.3.2.
O3 GEN OVERRIDE
This function controls the power to the ozone generator. Unlike
the other Diagnostic tests, O3 Gen Power remains in the state
(ON/OFF) you set it to even when Diagnostic mode is exited.
Function does not indicate status of generator.
RS-232
Causes a 1-second burst of data to be transmitted from the RS-
232 port. Used to diagnose RS-232 port problems. See Section
9.1.3.7, 9.3.2 for RS-232 port diagnostic techniques.