INFICON LDS3000 Modular Leak Detector - Manual (Page 31)

Operation 31
6.8 Activate/deactivate Z
ERO
Z ERO can be used to suppress undesired helium backgrounds. If Z ERO is enabled,
the currently measured leakage rate value will be interpreted as a helium background
and subtracted from all subsequently measured values.
The background value suppressed by Z ERO is adjusted automatically if the
background changes inside the unit.
Information If the signal filter Fixed or 2-Zone is selected, then the background value
is automatically adjusted based on the configured zero time.
► Enable or disable Z ERO as needed:
S ETTINGS > Z ERO /F ILTER > Z ERO > Z ERO MODE
Z ERO WITH S TART suppresses the helium background automatically when a
measurement is started.
► Enable or disable Z ERO WITH S TART as needed:
S ETTINGS > Z ERO /F ILTER > Z ERO > Z ERO WITH S TART
6.9 Selecting a signal filter
► As a rule, use signal filter I•CAL.
► If the signal filter should simulate the time behavior of older units, then use filter
Fixed or 2-Zone.
► Select desired signal filter:
S ETTINGS > Z ERO /F ILTER > F ILTER > F ILTER MODE
Signal filter
I•CAL
The leakage rates are averaged at time intervals that are optimized
for the range of the leakage rates.
Fixed The leak rates are averaged at fixed intervals of 0.2 seconds.
2-Zone
Filter compatible with LDS1000 and LDS2000
The averaging period is switched depending on the leak rate
threshold.