Teledyne 7300a - NDIR analyzer - Manual (Page 42)

4 Operation Model 7300A
4-6 Teledyne Analytical Instruments
If you do not wish to continue a function, you can abort the session by
escaping . Escaping a function takes the analyzer back to the previous screen, or
to the ANALYZE Function, depending on the function escaped.
reproduced, at the appropriate point in the procedure, in a
Mono-
spaced type style. Push-button names are printed in
Oblique type.
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 7300A is accurate to 2-3 %. Accordingly, internally
scheduled calibrations can vary 2-3 % per day.
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:
The VFD will display five subfunctions.
Call out MAIN MENU, scroll to AUTO-CAL function, and ENTER. A
new screen for
ZERO/SPAN set appears.
ZERO in Ød Øh off
SPAN in Ød Øh off
Use UP or DOWN key to blink ZERO (or SPAN ), then Enter . (You
won’t be able to set
OFF to ON if a zero interval is entered.) A Span Every ...
(or
Zero Every ...) screen appears.
Zero schedule: OFF
Day: Ød Hour: Øh
Use UP or DOWN key to set a value in days, then ENTER to move to the
start-time value in hours. Use UP or DOWN keys to set a start-time value, then
ENTER.
To turn
ON the SPAN and/or ZERO cycles (to activate AUTO–CAL): useUP
or DOWN keys to set the
OFF/ON field to ON. You can now turn these fields
ON because there is a nonzero span time defined.