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Teledyne 300 instruction manual →0 is detected, the CPU will go into hold-off

Models: 300

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→0) is detected, the CPU will go into hold-off.

3.6Remote 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-VARSand 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

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Teledyne 300 instruction manual →0 is detected, the CPU will go into hold-off
Page 42 Page 44

FAQ

What are the contact closures for remote adjustment?

The Teledyne Model 300 Analyzer can be adjusted via two contact closures labeled EXT_ZERO_CAL and EXT_SPAN_CAL. These contact closures are used for remote zero/span check or adjustment.

How to activate remote calibration signals?

The remote calibration signals can be activated in any sequence. To perform a zero check followed by a span check, generate a positive transition on EXT_ZERO_CAL for zero check and then on EXT_SPAN_CAL for span check.

Why should contact closures remain closed for at least 10 minutes?

Teledyne API recommends that contact closures remain closed for at least 10 minutes to allow for an accurate average zero or span value to be established.