How To Perform Sensor Calibration/MFC Setup
Chapter Seven: Operation in Setup Mode
196
Cold Cathode
CLOSE
SETUP
SENSOR CAL
Torr
LEFT DISPLAY
CENTER DISPLAY
RIGHT DISPLAY
The input channel
number is entered
here.
This is the disconnect threshold
pressure for the sensor reading.
This indicates a cold
cathode gauge.
MAIN DISPLAY
This is the combined gauge and gas correction factor.
This example shows the default value of 1.00 (one).
Figure 58: Sensor Calibration for Cold Cathode Gauges
Refer to How To Perform Sensor Calibration/MFC Setup, page 190, for steps 1 through 3.
A cold cathode sensor is indicated by the code cc.
4. Enter a combined gauge and gas correction factor (GCF).
A. If the display is correct, press the [
ENTER
] key.
B. If the display is incorrect, enter another value, then press the [
ENTER
] key.
The exact value for the combined gauge and GCF depends upon the type of gas used,
and it must also allow for some variability in the gauge itself.
The system responds by accepting the entered value, and causing the center display to
blink.
Note
1.
The default value for the gauge/gas correction factor is 1.00.
2.
In the 146 unit, the combined gauge/GCF value (between 0 and 10,
excluding 0), is used as a multiplier. Therefore, it functions as a
span adjustment factor.
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