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 115 of 160
GAS (Argon, etc.)
"GFx<cr>" 1. Remove a station from "Gas" operation. The "x" is the station number of the
station being removed from operation with "Gas". The operation is the reverse of
"GNx<cr>" below. The response to this command is "A<cr>".
"GNx<cr>" 2. Assign a station to operate with Gas. Where "x" is the station to be switched to
have it's response calibrated for gas. This command is different from assigning
"Gas" from the front panel in that it does not matter whether or not the station is
being displayed in the right hand display. In order for a station to be selected for
"Gas" operation by way of the front panel push button, the station must be being
displayed in the right hand display. The response to this command is "A<cr>".
HOT CATHODE
"AH<cr>" 1. Go to the AUTO mode. The command causes the resident hot cathode gauge
to be controlled by the thermocouple or convection gauge that has the lowest
station number.
By control is meant, should the pressure of the controlling sensor exceed twenty
microns, the hot cathode filament will shut off. It will come back on when the
pressure of the controlling sensor goes below 20 microns.
"EH<cr>" 2. Go to the SHUT-DOWN mode. This takes the hot cathode gauge out of the
AUTO mode or out of the OFF mode and allows it to shut itself down by virtue of it
reading a pressure above it's normal range. When so shut down, it must be
restarted either through the front panel commands, or through the RS232 "FN"
command.
"FF<cr>" 3. Turn the hot cathode filament OFF. This command turns off the filament of the
hot cathode gauge. The filament cannot be turned on neither through the front
panel controls, nor through the control of it's associated thermocouple or
convection gauge.
"GF<cr>" 4. Turn the 3D de-gas OFF. This command stops the de-gas function if it is active.
This does not inhibit setting up de-gas via the front panel. This is the only way the
degas can be halted, if it was started by the "GN<cr>" command.
"GN<cr>" 5. Turn the 3D de-gas ON. This command turns the 3D de-gas on for an indefinite
period of time. To shut it off, the "GF" command must be used. (Shutting power
OFF and back ON will also reset the de-gas).
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