The [ZERO] Key
Chapter Four: Functional Overview
62
The [ZERO] Key
The [
ZERO
] key allows you to zero the transducer from the 670 instrument. The 670
instrument performs the zero function on all three ranges (x1, x0.1, and x0.01).
Zero Enable
Ch 1
760 Torr
Zero Enable: ON
The zero enable entry must be ON for the 670 instrument to calibrate the zero. Use the Adjust
knob to toggle between ON and OFF. With the zero enable set to ON, advance to the zero
calibration screen to initiate the zero procedure. When the zero enable is set to OFF, no other
screens are available.
When the zero enable is off the signal used to zero the transducer is turned off. This capability is
useful in the situation that requires changing the transducer zero adjustment. Refer to your
transducer manual for calibration procedures.
Note
You cannot access the zero calibration screen when the zero enable entry
is OFF.
Zero Calibration
Ch 1
2E-3 Torr
Press ENTER to zero
This screen is accessible only when the zero enable entry is set to ON. To start the zero
procedure, press the [
ENTER
] key. The front panel will flash the message “
CALIBRATING
”
during the zero procedure.
Note
1.
Before you initiate the zero procedure, be sure that your system is
pumped down to a base pressure less than the resolution of the
transducer measuring the pressure of the system. Otherwise, the
resultant zero setting will be incorrect.
2.
The 670 instrument cannot correct for a transducer zero greater than
±2% of full scale.
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