FCO770 Users Guide Issue 1
Page 93
PROBLEM: THE RESULTS ARE UNSTABLE.
Cause:
There is an intermittent leak on the test system.
Action:
Do not use push-in air line fittings on the test line. Blank the instrument and
perform a self check to ensure the FCO770 is OK.
Cause:
The test system has flexible components.
Action:
Use rigid nylon tubing or metal tubing to eliminate flexing in the test pipes.
Cause:
The test item or jig has a "trapped volume".
Action:
Re-test a component without venting it. If the results are repeatable, then
either the stabilisation time needs extending or any restricted volumes in the
test item or jig need to be eliminated.
Cause:
Variable external factors are affecting the test.
Action:
Check that there are no heat sources affecting the test item (even overhead
heaters have been known to cause problems). Other external factors are:
operator handling, vibration on the test bench, and fluctuations in airline
pressure.
PROBLEM: INCORRECT TEST PRESSURE DISPLAYED.
Cause:
The pressure was zeroed in the commissioning menu when a pressure was
applied.
Action:
Use the commissioning menu to reset the pressure zero.
PROBLEM: RS232 (or RS485, USB, LAN) NOT IN PORT SELECTION LIST.
Cause:
The port is already in use by another feature, e.g. printer barcode or fbus
communications, or it is a build option that is not fitted.
Action:
Check that the port is not selected for use elsewhere.
Check that the port is physically fitted.
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