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 129 of 160
PROCEDURE FOR ON-SITE ELECTRICAL "VERIFICATION" OF TELEVAC MODULAR MM200 INSTRUMENTS
1. Install the proper cold cathode and/or the thermocouple gauge tube simulators at the end of
their respective cables. Use the 10
-3
Torr connection for the cold cathode gauge tube
simulator.
Observe the meter readings.
2. If the meter does not read, " 0.0" ("redline"), on the thermocouple stations of the modular
MM200 instrument, adjust the "zero adjust" ("heater adjust") potentiometer to bring the
reading to " 0.0". (Set at the point where display switches from "- 0.0" to " 0.0".
Replace the installed thermocouple gauge tube with a new gauge tube to be sure that the
gauge tube is not degraded by contamination.
3. On the cold cathode station of the modular MM200 instrument, observe that the readings fall
between 8 x 10
-4
and 2 x 10
-3
Torr.
Minor adjustment of the reading can be made to show agreement with the gauge tube
simulator. To do this, adjust the cold cathode 10
-3
potentiometer to give a reading of 1 x 10
-3
Torr.
Clean the gauge tube body and clean or replace the anode assembly.
4. Place an electrical "verification" sticker on instrument.
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