Chapter Four: Functional Overview
The [CAL] Key
61
System Check Calibration
Ch 1
9.9998
SYSCHK
This screen displays the system check value. This value can be used as a diagnostic tool.
Note
Be sure that the system is at the correct pressure for the type of
transducer, BEFORE using the SYSCHK function. Otherwise, the 670
unit may report erroneous values.
Absolute Transducers: Pump the system down to base pressure, that is, a
pressure below the resolution of the transducer.
Differential Transducers: Equalize the pressure on both the reference
(Pr) and measurement (Px) ports.
When you enter the SYSCHK screen, the 670 instrument sends out a digital signal to prompt the
transducer to return a 10 Volt signal. The value displayed in this screen reflects the value
returned by the pressure transducer. The system check value varies for each transducer, and can
range from 9.5 to 10.5 Volts. Refer to Troubleshooting, page 130, if your SYSCHK value does
not fall within this range.
For more information on calibrating the 670 unit, refer to How To Calibrate the 670 Instrument,
page 72.
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