Teledyne 3000TB-XL - Trace oxygen analyzer - Manual (Page 50)

4 Operation Model 3000TB
­XL
4-10 Teledyne Analytical Instruments
The self diagnostics are run automatically by the analyzer whenever the
instrument is turned on, but the test can also be run by the operator at will.
To initiate a self diagnostic test during operation:
Press the System button to start the System function.
TRAK/HLD Auto—Cal
PSWD Logout More
Use the < > arrow keys to blink More, then press Enter .
Version Self—Test
Use the < > arrow keys again to move the blinking to the Self–Test
function. The screen will follow the running of the diagnostic.
RUNNING DIAGNOSTIC
Testing Preamp — 83
During preamp testing there is a countdown in the lower right corner of
the screen. When the testing is complete, the results are displayed.
Power: OK Analog: OK
Preamp: 3
The module is functioning properly if it is followed by OK. A number
indicates a problem in a specific area of the instrument. Refer to Chapter 5
Maintenance and Troubleshooting for number-code information. The results
screen alternates for a time with:
Press Any Key
To Continue...
Then the analyzer returns to the initial System screen.
4.3.6 Version Screen
Move the < > arrow key to More and press Enter . With Version
blinking, press Enter . The screen displays the manufacturer, model, and
software version information.
4.3.7 Showing Negative Oxygen Readings
For software version 1.4.4 or later, the instrument only displays oxygen
readings that are positive or zero. The instrument can be reconfigured to
show negative readings if sensor output drifts below zero. This situation
may arise after the instrument has been zeroed, as time progresses the sensor
may drift below the zero calibration setpoint.