How To Zero a Sensor/MFC
Chapter Four: Operation in Normal Mode
110
Note
1. Zeroing a Pirani sensor preempts the factory set zero. To return to
the factory set zero, refer to How To Perform Sensor
Calibration/MFC Setup, page 190.
2. If there is no sensor for the channel number selected, the system
responds by beeping and displaying the
CAN
’
T ZERO
error
message.
3. If a sensor’s zero goes out of its normal range, the 146 unit responds
with the
CAN
’
T ZERO
error message.
4. Ion gauges cannot be zeroed since they are high vacuum gauges.
5. For the MKS Type 120 gauge, the zeroing occurs in both the sensor
and in the 146 unit. If the Type 120 gauge cannot complete the
zeroing itself, a
CAN
’
T ZERO
message is momentarily displayed
and the 146 unit completes the zeroing, provided the 120 gauge is
within ±0.8 V of zero.
6. TC gauges must be zeroed when used for the first time or when
replacing the current gauge with a new one.
7. The zero reading for a TC gauge can be toggled on or off. When on,
the 146 unit uses the stored zero power level. When off, the stored
zero power level is replaced with the factory default power level.
Refer to How To Toggle the Zero On and Off, page 112, for more
information.
8. When replacing a TC-1A gauge with a DV-6M gauge, the system
may require two zero commands to achieve a stable zero. This is due
to the difference in power levels and thermal response between the
two gauges.
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