Inficon Pernicka 700H CHLD, Translation Of The Original Operating Instructions

Page: 55 / 100

INFICON Operation | 6
Pernicka-700H-CHLD-Operating-instructions-jin76aen1-04-(1911) 55 / 100
Parameter Description
Mea Mode Choice of measurement method.
► Only use the default setting SAMP.
FirstMass Enter the mass to be measured (= gas).
1 For example, to measure helium, enter the value
"4.00".
2 For example, to measure the background, enter the
value "5.00".
Width ► Use the default setting "0".
Dwell/Speed Dwell time of the CHLD-Sensor on each mass. The
following relationships apply. High expected signal
amplitudes require only short dwell times for sufficient
measuring sensitivity and thus enable faster measuring
times. Small signal amplitudes require longer dwell times
in order to increase the measuring sensitivity, resulting in
longer measuring times.
► Use the reference value "500" for helium (mass 4) and
the reference value "500" for the background (mass 5).
For leak rates less than 2 x 10-12 mbar l/s, these values
must be correspondingly increased, e.g. "5 s" for a
leakage rate of 2 x 10-13 mbar l/s. Shorter measuring
times result in larger measured values.
Resolution How many measuring points per mass (resolution).
► Use the default setting "50".
Amp Mode Operating mode of the amplifier.
► Use the default setting "Auto".
Amp Range Area of the preamplifier.
Pause Cal Settling time after changing the mass.
► Use the default setting "0.50".
SEM Used preamplifier
► Use the default setting "0".
6.3.5 Set the setpoint for gross leak test
With the setpoint for the gross leak test you define the upper limit for the gross leak
test. Below this setpoint, the test objects to be measured do not have any gross leaks.
The setpoint to be set refers to the helium raw signal in the measuring unit [A].
If the measured helium signal is greater than the setpoint after the gross leak test, the
measurement process is terminated.