HP 5973 - To Monitor High Vacuum Pressure

44
2 Operating the MSD
To monitor high vacuum pressure
To monitor high vacuum pressure
Materials needed: Gauge controller (HP 59864B)
Triode gauge cable (8120-6573)
1 Connect the gauge controller to the triode gauge tube (page 60).
2 Start up and pump down the MSD (page 58).
3 Switch on the power switch on the back of the gauge controller.
4 Press and release the
GAUGE button.
After a few seconds, the pressure should be displayed.
Pressure is displayed in the format
X.X – X where – X is the base 10 exponent.
Units are Torr.
The gauge controller will not turn on if the pressure in the MSD is above approxi-
mately 8 × 10
-3
Torr. The gauge controller will display all 9s and then go blank. The
triode gauge tube can measure pressures between approximately 8 × 10
-3
and
3 × 10
-6
Torr. The gauge controller is calibrated for nitrogen, but all pressures
listed in this manual are for helium.
The largest influence on operating pressure is the carrier gas (column) flow. The
following table lists typical pressures for various helium carrier gas flows. These
pressures are approximate and will vary from instrument to instrument.
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