Trace Oxygen Analyzer
Operation
Teledyne
Analytical
Instruments
37
4.2.2.2
ESCAPE
A turn-and-release toward ESCAPE moves the blinking to the next
field on the left. When you are on the leftmost field, another ESCAPE
takes you back to the previous screen.
If you do not wish to continue a function, you can abort the session
by escaping to the leftmost field, and then issuing another ESCAPE.
Escaping a function takes the analyzer back to the previous screen, or to
the ANALYZE Function, depending on the function escaped.
4.3 The AUTO-CAL Function
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: If you require highly accurate timing of your AUTO-CAL,
use external AUTO-CAL control where possible. The
internal clock in the Model 3020T is accurate to 2-3 %.
Accordingly, internally scheduled calibrations can vary 2-
3 % per day.
To setup an
AUTO-CAL
cycle:
Scroll to
AUTO-CAL
, and ENTER. A new screen for
Span/Zero
set
appears.
Span OFF Nxt: 0d 0h
Zero OFF Nxt: 0d 0h
If
SPAN
(or
ZERO
) is not flashing, scroll with DOWN/UP control
to
SPAN
(or
ZERO
), 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.
Span Every 0 d
Start 0 h from now
Use DOWN/UP control to set an interval value, and ENTER. Then
use DOWN/UP to set a start-time value, and ENTER.
Span OFF Nxt: 0d 0h
Zero OFF Nxt: 0d 0h
When the
Span/Zero
values screen appears, use the scroll DOWN to
blink the
OFF
/
ON
field
of the
SPAN
(or
ZERO
) function. Use