Varian 948, Operation And Service Manual

Page: 146 / 176

Models 947, 948 and 960 Leak Detectors Operations and Service Manual
C-2
Table C-1 through Table C-4 outline the available control and query commands.
❑ Table C-1 lists inquiries used to determine internal operating parameters.
All inquiries, except VER, begin with
?
and end with <CR>.
❑ Table C-2 on page C-5 lists commands used to set NON-VOLATILE operating
parameters.
❑ Table C-3 on page C-6 lists commands used to cause an immediate change in the
spectrometer operating parameters. These commands do not change the non-volatile
operating parameters.
❑ Table C-4 on page C-7 lists commands used to cause certain leak detection actions.
Table C-1 Internal Operating Parameters
Inquiry Response
?ALL Nine lines that report a summary of all ion source parameters. Each line begins
with a <CR><LF>. The format is as follows:
FILAMENTBIAS 122.1 Reports the filament bias voltage.
IONCHAMBER 269.1 Reports the ion chamber voltage.
VARIABLEFOCUS 235.4 Reports the variable focus voltage.
REPELLER 402.2 Reports the repeller voltage.
FIXEDFOCUS 212.7 Reports the fixed focus voltage.
SUPPRESSOR 145.0 Reports the suppressor voltage.
EMISSIONCURRENT 1.040Reports the emission current.
OFFSET 59 Reports the preamp offset index.
GAIN 2.5 Reports the leak rate gain factor.
?AZ<0 A string of three characters that reads either off or on to tell whether
AUTOZERO <0 is operating.
?CALOK One line. yes or no, indicating the success of the last CALIBRATE.
?EMISSIONCURRENT Reports the emission current. The format is: EMISSIONCURRENT 1.040
?FILAMENTBIAS Reports the filament bias voltage. The format is: FILAMENTBIAS 122.1
?FIXEDFOCUS Reports the fixed focus voltage. The format is: FIXEDFOCUS 212.7
?FL-XFER A string of seven characters that tells the maximum pressure in Torr for transfer
from gross leak test to fine leak test (e.g., 1.0E-01).
?GAIN A three-character number consisting of a two-digit gain factor with a decimal
point after the first digit.
?GL-XFER A string of seven characters that tells the maximum pressure in Torr for transfer
from roughing to gross leak test (e.g., 7.5E-01).
?IONCHAMBER Reports the ion chamber voltage. The format is: IONCHAMBER 269.1