Varian 979 Series, Operation Manual

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Model 979 Series Helium Mass Spectrometer Leak Detector
DRAFT 9/15/03
B-7
The commands listed in Table B-2 are used to set non-volatile operating parameters. The
current value of the operating parameter is changed to the new value.
?TURBO Three lines. Each begins with a <cr><lf>. The first line consists of the words
turbo followed by either Ok or Not Ok. The second line consists of the words
turbo followed by either Fault or No Fault. The third line consists of the words
“turbo speed” followed by Off or Slow.
?VALVESTATE Reports the current mode of the valves: Vent, Hold, Rough, etc.
?VARIABLEFOCUS Reports the variable focus voltage.
VER One line, which reports a date in the form LA02.00 followed by a six-digit
hexadecimal checksum.
WHYNOCAL Reports the calibration failure diagnostics.
Table B-2 Non-Volatile Operating Parameters
Command Parameter
INIT-AZ<0 Preceded by 0 or 1, sets the status of Auto-zero < 0. 0 = off, 1 = on.
INIT-CL-XFER Preceded by X.XE-XX, sets the value of the contra-flow mode crossover
pressure in Torr.
INIT-DAC Preceded by a number 0 to 255, sets the offset of the leak rate output voltage
DAC.
INIT-DISPLAY Preceded by LOG or LINEAR, sets the large bar graph to a log or linear display.
INIT-EMISSION A four-digit number of microamps, in the range 0300 to 2000, which sets the
emission current of the ion source.
INIT-EXTLEAK Same as INIT-STDLEAK, but for the value of the external leak.
INIT-FILAMENT A single digit, either 1 or 2, which sets the operating filament in the ion source.
INIT-FOCUS A three-digit number of volts, in the range 150 to 400, which sets the variable
focus voltage of the ion source.
INIT-GAIN A two-digit number with a decimal point after the first digit, in the range 1.0 to
6.0, which sets the position of a variable gain (digi-pot) device used for adjusting
the helium signal to match a calibration standard leak.
INIT-GL-XFER Preceded by X.XE-XX, sets the value of the gross leak crossover pressure in
Torr.
Table B-1 Internal Operating Parameters (Continued)
Inquiry Response