Teledyne 2000A-EU - General purpose thermal conductivity analyzer - Manual (Page 43)

Thermal Conductivity Analyzer Operation 4
4-5 Teledyne Analytical Instruments
4.3.1 Setting the Display
If you cannot read anything on the display after first powering up:
1. Observe LED readout.
a. If LED meter reads 8.8.8.8.8., go to step 3.
b. If LED meter displays anything else, go to step 2.
2. Press
button twice to turn Analyzer OFF and ON again.
LED meter should now read 8.8.8.8.8.. Go to step 3.
4.3.2 Setting up an AUTO-CAL
When proper automatic valving is connected (see chapter 3, installation),
the Analyzer can cycle itself through a sequence of steps that automatically zero
and span the instrument.
Note: Before setting up an AUTO-CAL, be sure you understand the
Zero and Span functions as described in section 4.4, and
follow the precautions given there.
Note: If you require highly accurate AUTO-CAL timing, use external
AUTO-CAL control where possible. The internal clock in the
Model 2000 is accurate to 2-3 %. Accordingly, internally sched-
uled calibrations can vary 2-3 % per day.
Note: If all your ranges are for the same gas application, then AUTO-
CAL will calibrate whichever range you are in at the scheduled
time for automatic calibration.
Note: If your ranges are configured for different applications, then
AUTO-CAL will calibrate all of the ranges simultaneously (by
calibrating the Cal Range).
To setup an
Auto–Cal cycle:
Choose System from the Function buttons. The VFD will display five
subfunctions.
CONTRAST AUTO—CAL
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Use < > arrows to blink
AUTO—CAL
, and press Enter . A new screen
for
ZERO/SPAN set appears.
Contrast Function is DISABLED
Contrast Function is DISABLED
(Refer to Section 1.6)
(Refer to Section 1.6)