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Teledyne API Model 401 O
3
Photometric Calibrator Instruction Manual, 01124, Rev. J2
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.
3.8 Remote Zero/Span Check Or Adjustment (RS-232)
Besides Z/S checking from the front panel, automatic Z/S checking, and remote Z/S checking via
the contact closure inputs, the Analyzer can also be checked via the RS-232 interface. Remote
checking via the RS-232 interface supports zero, span, and zero followed by span check, and is
identical to remote check via the contact closure inputs.
This RS-232 control feature is provided mainly so that a host computer at another location can
control the Analyzer. See Section 7 for detailed information on using the RS-232 interface to do
a remote Z/S check.
3.9 Hold Off
Every type or check or adjustment (zero, span, manual, remote, etc.) is followed by a hold-off
period of 30 seconds during which the internal data acquisition system (DAS) does not
accumulate ozone readings into the DAS average.
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