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3.6 Remote zero/span check or adjustment
(contact closure)
In addition to adjustment via the front panel buttons, the Analyzer can be adjusted by
means of two contact closures called EXT_ZERO_CAL and EXT_SPAN_CAL. (See
Figure 1.2 for the location of the terminals for connection of the contacts on the rear
panel.) The CPU monitors these two contact closures every 1 second and looks for a
positive transition (i.e. 0
→
1) on either signal. If a positive transition occurs on
EXT_ZERO_CAL, the CPU will perform a zero check. If a positive transition occurs on
EXT_SPAN_CAL, the CPU will perform a span check. When a negative transition i.e. 1
→
0) is detected, the CPU will go into hold-off.
Also, if a positive transition occurs on either signal while the M300 is in zero, span check
or hold off, it will immediately switch to the specified mode. For example, if the
analyzer is in zero check and a positive transition is detected on EXT_SPAN_CAL, then
the instrument will immediately go into span check. To perform a zero check followed
by a span check, first generate a positive transition on EXT_ZERO_CAL, and then when
you want to do the span check, generate a positive transition on EXT_SPAN_CAL.
The remote calibration signals may be activated in any sequence, providing a virtually
unlimited number of calibration types.
Remote adjustment is similar to automatic Z/S checking in that if dynamic calibration is
enabled, the internal CO formulas will be modified following calibration. To enable or
disable adjustment, press SETUP-MORE-VARS and press NEXT until the variable
DYN_ZERO or DYN_SPAN is displayed. To change the setting, toggle the value
between OFF - ON and press ENTR to store the new value or EXIT to leave the value
unchanged.
NOTE
TELEDYNE API RECOMMENDS THAT CONTACT
CLOSURES REMAIN CLOSED AT LEAST 10 MINUTES TO
ALLOW FOR AN ACCURATE AVERAGE ZERO OR SPAN
VALUE TO BE ESTABLISHED.
P/N 02163G1 Teledyne API Model 300 CO Analyzer Instruction Manual - Page 37