XGS-600 Gauge Controller
DRAFT 4/15/14
55
Board Specifications/Descriptions
HFIG Board
The HFIG board operates all Agilent hot filament gauges and most other available
Bayard-Alpert type hot filament ionization gauges including nude UHV types. The board
can be set up for all Agilent hot filament gauges and allows you to set gauge emission
current, sensitivity value, and gas correction factor. The UHV range and E-Beam degas are
standard, as is dual filament control, remote I/O control of emission and filament selection,
and 0 to 10 V analog output.
Table A-2 HFIG Gauge Specifications
Item Description
Supported Gauge Heads
❑ Agilent 563, 564, 571, 572, UHV24, UHV24p, MBA-100,
MBA-200, MBA2
Displayed Measurement Range*
❑ 5.0E-12 Torr to 1 mTorr (UHV24, UHV24p, 572)
❑ 5.0E-11 Torr to 10 mTorr (563, 571, MBA100, MBA200,
MBA2)
* This represents the ability of the controller to display pressure
values and not the capability of the gauge heads to accurately
measure pressure.
Emission Current 0.1 to 10.0 mA
Sensitivity Input Range 00.1 to 99.9/Torr
Gas Correction Factor Range 0.01 to 9.99
Degas E-Beam type, 600 V at 10 mA, enabled only when pressure is
below 1.0E-05 Torr. Pressure indications displayed during degas.
Automatic shutoff after approximately 25 minutes, or manual
shutoff.
Analog Output
❑ Range: 0-10 VDC
❑ Slope: 1 V per decade log
❑ Characteristic: output voltage = Log (Pressure) + 11
❑ Output when gauge OFF or Error = 10V
❑ Load Impedance: >10 kOhms
❑ Response Time:
❑ SLOW - 250 msec
❑ FAST - 10 msec
Error Detection
❑ Open Filament
❑ Shorted Grid
❑ Over Temperature
❑ Over Pressure (1mT or 10mT dependent on tube type
selected)
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