Models 947, 948 and 960 Leak Detectors Operations and Service Manual
C-6
Table C-3 lists the commands used to cause an immediate change in the spectrometer
operating parameters. These commands do not change the non-volatile operating
parameters.
INIT-RANGESTOP
Sets the most sensitive range exponent attainable when the feature is
operating. Preceded by a minus sign and one or two digits (e.g., -08).
INIT-REPELLER
Sets the repeller voltage of the ion source. A three-digit number of volts, in the
range 200 to 450.
INIT-ROUGH
A one-to-three digit number of seconds of maximum roughing time for
auto-sequencer operation.
INIT-SPEED
Sets the operating speed of the high vacuum pump. Enter 0 (for slow) or 1
(for fast), then INIT-SPEED. For example, entering 0 INIT-SPEED<CR>
commands the high vacuum pump to run at slow speed.
INIT-STDLEAK
The helium leak rate number in atm cc/sec of the calibrated standard leak. The
format is: a two-digit leak rate mantissa with a decimal point after the first digit,
E
−
, and a single digit which is the leak rate range exponent.
Values outside the working range of the leak detector are not stored.
INIT-TEST
A one-to-three digit number of seconds of maximum testing time for
auto-sequencer operation.
Table C-3
Spectrometer Operating Parameters
Command
Response
PUT-EMISSION
Sets the emission current of the ion source. A four-digit number of microamps,
in the range 300 to 2000.
PUT-FOCUS
Sets the variable focus voltage of the ion source. A three-digit number of volts,
in the range 100 to 350.
PUT-GAIN
Adjusts the helium signal to match a calibrated standard leak. A two-digit
number with a decimal point after the first digit, in the range 1.0 to 9.0.
PUT-ION
Sets the ion voltage of the ion source. A three-digit number of volts, in the
range 150 to 350.
PUT-OFFSET
Sets the preamplifier offset index for nulling the preamplifier in the spectrometer
tube. A two-digit number, in the range 00 to 99.
PUT-REPELLER
Sets the repeller voltage of the ion source. A three-digit number of volts, in the
range 200 to 450.
Table C-2
Non-volatile Operating Parameters (Continued)
Command
Response
