INSTRUMENT MANUAL
VACUUM GAUGE MODEL MM200
160Phone:(215) 947-2500 fax:(215) 947-7464 e-mail:sales@televac.com web site:www.televac.com
MM-200_im REV M
Page 52 of 160
407 HOT CATHODE MODULE (Mini BA) (Software ver. 2.31 or higher)
The hot cathode mini-BA operates in the range of 10-2 to 10 –11 Torr. It is recommended to enter the setup mode
and select the setting that will best fit your application before continuous operation. Refer to the setup section in the
manual.
SENSITIVITY
The sensitivity of the hot cathode mini-BA can vary slightly between gauges. In order to achieve the most accurate
reading from the gauge the sensitivity can be adjusted in setup. This factory-preset value is 10.0 (1 / Torr). It can
be set from 5.0 to 20.0. To set this value, refer to the setup section of the manual.
DEGAS
Over time and depending on the process gases used, the gauge can become contaminated. Degassing the gauge
will clean the tube of these impurities. Degas increases the emission current and raises the grid voltage. After
degas, it may be several hours for the gauge to become stable. In order to degas the gauge, the pressure must be
below 10-5 Torr. To degas the gauge, refer to the setup section of the manual.
FILAMENT
There are 2 filaments in the hot cathode mini-BA gauge. To change the filament number, refer to the setup section
of the manual.
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