INSTRUCTION MANUAL
DPS400
56-101-01180-C
1-4
Page 1
November 5, 2003
SECTION 4:
OPERATION
1. GENERAL
The user should become familiar with the DPS400 Test Set before attempting any test. The
procedures described in this manual are not intended to replace the specifications of the airframe
nor the instrument manufacturer. Particular attention should be given to preliminary setup
procedures to avoid erroneous test results and the possibility of tripping the protection circuits of
the tester. Strict adherence to the procedures for returning the test set and aircraft systems to
ambient pressure are advised to safeguard the sensitive instruments in the aircraft from
conditions such as negative airspeed and over pressurization.
Caution:
Do not use unnecessary force to adjust any test set metering valve. Positive
stop spacers have been installed on all metering valves to permit firm closing of
the valves without damage. However, excessive force can overcome the knob
set screw resulting in valve damage. The same caution applies when using the
knob on the pressure regulators.
Note:
The term "ambient" will occur frequently in these instructions. It refers to the existing
atmospheric pressure in the area where the test is being performed.
Each test set is completely calibrated and tested before shipment. To ensure the integrity of the
tests, the tester should be leak checked before each use.