Chapter Seven: Operation in Setup Mode
How To Perform Sensor Calibration/MFC Setup
195
Refer to How To Perform Sensor Calibration/MFC Setup, page 190, for steps 1 through 3.
4. Verify that the 146 unit has correctly determined the sensor type. If the sensor type is
incorrect, use the arrow keys to change the sensor type entry. If you have a convection
gauge, use Code 18x to verify the type of gauge.
The 146 unit cannot distinguish between a Convectron gauge and an HPS CEP gauge. If
you are using an HPS CEP gauge you must select it using Code 18x, as described in
Code 18x: How To Select the Convection Gauge, page 245.
Note
Turn the channel off before you attempt to change the convection gauge
type. The command will not be accepted if the channel is on.
A. If the display is correct, then press the [
ENTER
] key.
B. If the display is incorrect, scroll to the correct sensor type, then press the [
ENTER
]
key.
The system responds by accepting the sensor type, and blinking the right display.
5. Use the arrow keys to select the gas type (n2 for nitrogen, HE for helium, and Ar for
argon). The default gas type is nitrogen.
A. If the display is correct, then press the [
ENTER
] key.
B. If the display is incorrect, scroll to the correct gas type, then press the [
ENTER
] key.
The system responds by accepting the gas type, and blinking the center display.
6. Confirm if the zero (left) and span (right) parameters are correctly listed as Factory-
defined or User-defined. The default is Factory-defined zero and span.
A. If the display is correct, then press the [
ENTER
] key.
B. If the display is incorrect, press the [
ZERO
/
EXP
] or [
SPAN
/.] keys to toggle the left
and right parameters (respectively), between F (Factory-defined) and U (User-
defined) zero and span values, then press the [
ENTER
] key.
The system responds by accepting the zero and span parameter definitions.
Note
Zeroing or spanning a Pirani or convection gauge in Normal or Leakage
Mode, switches the center display to U (User defined).
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