User guide

Percent Paramagnetic Oxygen Analyzer Operation 4
4-5
Teledyne Analytical Instruments
4.3 The AUTO-CAL Function
When proper automatic valving is connected (see chapter 3, installa-
tion), the Analyzer can cycle itself through a sequence of steps that automati-
cally 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 3020M is accurate to 2-3 %. Accordingly, inter-
nally 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 ap-
pears.
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 DOWN/UP
to set the OFF/ON field to ON. You can now turn these fields ON because
there is a nonzero span interval defined.
4.4 The PWD (Password) Function
Security can be established by choosing a 5 digit password from the
standard ASCII character set. If you decide NOT to employ password
security, use the default password TETAI. This password will be displayed
automatically by the microprocessor. The operator just ENTERs it to be
allowed total access to the instrument’s features.
Once a unique password is assigned and activated, the operator MUST
enter the UNIQUE password to gain access to any of the set-up functions
(except to enter the password). However, the instrument will continue to