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6.6.1.1.
6.6.1.2.
LACO Technologies
System Calibration
For hard vacuum test methods, it is recommended that the ATLAS controller
performs a system calibration. The system calibrations will involve a calibrated leak
standard that is used for calibration cycles, typically an open-style leak. To run
calibration cycles the user must have a known good part or a machined "dummy
part" that the leak can be attached to. It is recommended that this "calibration" or
"golden part" be specially marked or identified and kept near the ATLAS.
The calibration settings in section 6.4.1 are used in conjunction with running a
system calibration. The following conditions will require a new system calibration
cycle to be performed:
•
Startup of the machine.
•
New test recipe loaded.
•
Critical test parameters are changed.
The hours and cycles Cal valid parameters on the calibration screen determine the
frequency of system calibrations. Whichever of these tow values expires first will
cause the ATLAS to require a system calibration. When a calibration is required,
"Calibration Required" will be displayed on the Test Screen. Normal auto test
cycles cannot be initiated when a calibration is required.
Calibration Steps:
1. Press the cal button of the sidebar to change to calibration mode.
2. Install a known good part or calibration part, depending on configuration
and install the calibration leak.
3. If required, make the appropriate connections to the part.
4. Press the green start cycle button to start the calibration cycle. Depending
on the configuration, the cycle my start automatically when the chamber is
closed.
5. The controller will run a full test cycle. If a fault occurs during the test, the
sequence will immediately stop and wait for the operator to acknowledge
the fault by pressing the Abort/Reset button.
6. If the leak rate signals during calibration are within the acceptable range of
the calibrated leak value, then calibration is successful, and a calibration
factor (CF) is stored (See section 6.5.6).
Running automated Tests
Once the ATLAS has been calibrated, part leak testing can occur. To run an
automated test cycle:
1. Verify the cal button is disabled to enable auto test mode.
2. Install a test part and make all appropriate connections to the part, if
required.
ATLAS Operations and Maintenance Manual
6 OPERATION
45
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