INFICON Composer Gas Concentration Controller - Manual (Page 95)

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Composer Operating Manual
3.2.5 Why is a Digital Connection to the
System Controller Preferred?
Digital information is not corrupted or distorted by small changes in amplifier
gain or offset that is often induced by temperature changes or grounding
problems. The high precision concentration information available from this
Instrument System requires that any analog instrumentation connected to it be
able to measure and generate voltages with accuracy and reproducibility to less
than 1 mV in 10 V in order to not lose available precision. Careful selection of
the analog ranges, see
section 4.3.6.8, CONCENTRATION OUT Connector, on
page 4-27 and section 4.3.6.10, CONTROL IN Connector, on page 4-28 , will
help optimize performance.