Version Screen; Showing Negative Oxygen Readings - Teledyne 3000TA Operating Instructions Manual

4 Operation
Press the System button to start the System function.
Use the < > arrow keys to blink More, then press Enter.
Use the < > arrow keys again to move the blinking to the Self–Test
function. The screen will follow the running of the diagnostic.
During preamp testing there is a countdown in the lower right corner of
the screen. When the testing is complete, the results are displayed.
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:
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.
To show negative oxygen readings on the display:
- Press the System key
4-10
TRAK/HLD Auto—Cal
PSWD Logout More
Version Self—Test
RUNNING DIAGNOSTIC
Testing Preamp — 83
Power: OK Analog: OK
Preamp: 3
Press Any Key
To Continue...
Teledyne Analytical Instruments
Model 3000TA