INFICON LDS3000 Modular Leak Detector - Manual (Page 34)

34 Operation
6.10.3 Enable/disable Calibration request
If Calibration request is enabled, the unit will prompt the user to perform a calibration
30 minutes after it has been switched on and in case of temperature changes greater
than 5 °C.
► Enable or disable Calibration request as needed:
F UNCTIONS > C AL > S ETTINGS > C AL REQUEST > C ALIBRATION REQUEST
6.10.4 Setting machine and sniff factor
The internal calibration will only calibrate the measurement system of a mass
spectrometer module that is uncoupled from the test system. If the unit is operated
in parallel to an additional pump system after an internal calibration (following the
split flow principle), the unit will indicate a leakage rate that is too low based on the
split flow ratio.
With the help of a corrective machine factor (in vacuum mode) and a sniff factor (in
sniffer mode), the unit indicates the actual leakage rate.
6.10.4.1 Setting machine and sniff factor manually
 Mass spectrometer module calibrated internally.
1 Measure external test leak using the test system.
 The unit indicates a leakage rate that is too low based on the split flow ratio.
2 Setting machine / sniff factor:
S
ETTINGS > S ET UP > O PERATION MODES > V ACUUM /S NIFFER > M ACHINE FACTOR >
M ASS 2/3/4 > M ACHINE / SNIFF FACTOR M2/3/4
 The unit indicates the actual leakage rate.
6.10.4.2 Setting machine and sniff factor using machine calibration
 Internal test leak connected.
 External test leak installed in or on the test system and closed.
1 Enter leakage rate of the internal and external test leak via digital interface
(control unit CU1000, I/O module IO1000 or bus module BM1000).
2 Start machine calibration.
 Internal calibration is performed automatically.
 Request O
PEN TEST LEAK (External test leak).
3 Open external test leak and valve (if present) between the leak detector and the
system.
4 Confirm tuned and stable leakage rate signal.
 Request C
LOSE TEST LEAK (External test leak).
5 Close external test leak.
6 Confirm tuned and stable leakage rate signal.
 Machine/sniff factor is defined.