Teledyne 3000TA-EU - General purpose trace oxygen analyzer - Manual (Page 48)

Operation 3000TA- EU
Teledyne Analytical Instruments
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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: If you require highly accurate Auto-Cal timing, use external
Auto-Cal control where possible. The internal clock in the
Model 3000TA is accurate to 2-3 %. Accordingly, internally
scheduled calibrations can vary 2-3 % per day.
To setup an Auto–Cal cycle:
Choose System from the Function buttons. The LCD will display
five subfunctions.
TRAK/HLD Auto—Cal
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Use ◄►arrows to blink Auto—Cal , and press Enter. A new screen
for Span/Zero set appears.
Span OFF Nxt: 0d 0h
Zero OFF Nxt: 0d 0h
Press ◄►arrows to blink
Span (or Zero ), then press Enter again.
(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 ▲/▼ arrows to set an interval value, then use ◄► arrows to
move to the start-time value. Use ▲/▼ arrows to set a start-time value.
To turn ON the Span and/or Zero cycles (to activate Auto-Cal):
Press System again, choose Auto—Cal, and press Enter again. When
the Span/ Zero values screen appears, use the ◄► arrows to blink the
Span (or Zero) OFF/ON field. Use
▲/▼ arrows to set the OFF/ON
field to ON. You can now turn these fields ON because there is a
nonzero span interval defined.