7. MAINTENANCE, ADJUSTMENTS AND CALIBRATION
Page 201
© 2009 DH Instruments, a Fluke Company
•
Check that rear panel cooling fan operates when PPC4 is On.
•
Check that internal screws, bolts and nuts are tight.
•
Verify that internal barometer, if present, reads atmospheric pressure within ± 0.1 kPa (0.015 psi).
Adjust if necessary (see Section 7.3)
•
Verify that utility sensor, if present, indicates pressure with ± 0.1 % FS over its range. Adjust if
necessary (see Section 7.4).
•
Pressurize PPC4 to 90 % of maximum pressure and leak test. Select
<Leak>
in the Main Menu for
Basic Interface. Use the Leak Test shortcut from the Main Run Screen in the Advanced Interface
(see Section 3.2.18). Leak rate, after stabilization, should not exceed 0.001 % of maximum pressure/
second.
•
Check the PPC4 controls within specifications over its range (see Section 1.2.3).
•
Perform calibration of Q-RPTs if necessary (see Section 7.2).
7.9
Subassembly Description and Location
Warning
To avoid electric shock, disconnect mains power before removing the top cover.
Display
Pressure Control
Module
Power Supply Module
On-Board Barometer
(if present)
Optional interfaces
Q-RPT Modules
(configuration varies)
Vacuum Sensor
PowerPC board
PPC4 driver board
Figure 30.
Internal View
Summary of Contents for PPC4
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