How To Toggle the Zero On and Off
Chapter Four: Operation in Normal Mode
112
How To Toggle the Zero On and Off
Once a sensor or MFC has been zeroed, use this procedure to toggle between undoing the zero,
and then re-instating the zero again. When the zero is toggled off, the original, unzeroed
sensor/MFC reading is displayed. Toggling a sensor’s zero on and off is useful as a diagnostic
aid or for a transducer calibration check.
1. Repeatedly press the [
DISPLAY MODE
] key until the 146 unit is in Normal Mode.
The system responds by scrolling through modes.
2. Press the [
ZERO
/
EXP
] key, then the [
OFF
/
GAIN
] key, followed by [1], [2], [3], or [4].
The system responds by bypassing the user-defined zero of the sensor/MFC on the
selected channel.
Note
1. For the MKS Type 120 capacitance manometer, the zero is bypassed
both in the sensor and in the 146 unit.
2. For Pirani gauges, the factory-set zero becomes effective.
3. For TC gauges, the factory default power level is used. The gauge
will not yield accurate pressure measurements when the zero is
toggled off!
3. Press the [
ZERO
/
EXP
] key, then the [
ON
/
LEAD
] key, followed by [1], [2], [3], or [4].
The system responds by undoing the previous command, and restoring the channel’s
user-defined zero.
Note
1. For the MKS Type 120 capacitance manometer, the zero is restored in
both the sensor and in the 146 unit.
2. For Pirani gauges, the user-defined zero is restored.
3. For TC gauges, the stored zero power level is restored.
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