Chapter Four: Functional Overview
The [ZERO] Key
63
The zero calibration applies a zero correction factor to assign the present voltage reading a
pressure of 0.00 Torr (or to the base pressure reading appropriate for the units you are using).
This correction factor accounts for any voltage offset caused by the transducer or the wiring
between the transducer and the 670 instrument. When the zero enable is OFF, the 670
instrument does not apply any zero correction factor to the pressure signal. The 670 instrument
sets the zero value as close to 0.00 Torr as possible. This allows you to remove any transducer
zero without effecting the null calibration.
Note
When using a Type 274 multiplexer, you must perform the zero
calibration on each channel you intend to use.
Remote Zero Feature
The 670 instrument can be zeroed remotely through pins on the I/O connector, when the Key
Lock switch is in the
REMOTE
position.
For more information on the zero feature, refer to:
How To Calibrate the 670 Instrument, on page 72
How To Use the Remote Zero Feature, on page 80
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