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P3000 Series
Users Manual
6-2
High PCU Fall-Rate
The piston will always fall slowly as the gas passes between the piston and cylinder.
However, this fall rate will never be so fast that a stable reading cannot be made.
1. The system may be leaking. Check that exhaust valve is fully closed, and test port
connections are correctly made.
2. The DUT may be leaking. This can be verified by recording the fall rate, and
comparing it with the fall rate under the same conditions but with the DUT removed
and the test port blanked off.
3. If the system has been pressurized quickly, then sufficient time must be allowed for
the instrument to thermally stabilize. Continue re-floating the piston until the fall rate
stabilizes. This should take no longer than one minute.
Handpump Malfunction
If the system pressurizes and depressurizes in conjunction with the downward and
upward strokes of the pump, then the outlet check valve has failed completely. This
should be disassembled and inspected for dirt or damage to valve seat and seal. After
inspection, clean all parts carefully, replace as required, and re-assemble correctly, see
Chapter 5, Maintenance & Servicing, Handpump Assembly section.
1.888.610.7664 sales@GlobalTestSupply.com
Fluke-Direct.com
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