RPM4-AD™ OPERATION AND MAINTENANCE MANUAL
© 2005-2007 DH Instruments, a Fluke Company
Page 118
Note: If RPM4-AD indicates
<SDS CLOSED>
, the Q-RPT’s
TEST
port is
closed and pressure from the reference standard will not be able to reach it
until SDS is opened.
Opening SDS with a pressure greater than Pmax! applied to the test port may cause
overpressure damage to the Q-RPT.
5.2.3.2
RPM4 A350K/A160K (FIXED WING)
To set-up and prepare an RPM4-AD A350K/A160K for calibration of its Q-RPTs:
Set the RPM4-AD on a stable surface near the calibration standard at a
height as close as possible to the calibration standard’s reference height.
Consider the connections that may need to be made to the rear panel and
access to the front panel display and keypad.
Connect the calibration standard output to the
TEST
port of the Q-RPT to be
calibrated.
Use the
TEST(Ps)
port for the A160K (23 psia) Q-RPT.
Use the
TEST(Pt)
port for the A350K (50 psia) Q-RPT.
The
TEST
port connections are is AN4 M.
Use
[RANGE]
to set the active Q-RPT to
<Lo>
for the A160K Q-RPT or
<Hi>
for the A350K Q-RPT(see Section 3.3.1.2).
Use
[MODE]
to set the measurement mode to absolute (see Section 3.3.3).
Use
[UNIT]
to set the unit of measure to a pressure unit (not an air data unit)
(see Section 3.3.2).
Use
[SDS]
to open SDS (Self Defense System) on the selected Q-RPT (see
Section 3.3.8) so that the pressure applied by the standard will reach the
Q-RPT.
Opening SDS with a pressure greater than Pmax! applied to the test port may cause
overpressure damage to the Q-RPT.
5.2.4
RECOMMENDED CALIBRATION POINT SEQUENCE
Calibration adjustments to RPM4-AD Q-RPTs are made by altering calibration coefficients,
PA and PM (see Section 5.2.1.1). To adjust these coefficients to optimum values giving the
best results over the Q-RPTs complete operating range, specific calibration point sequences
are recommended.
See Section 5.2.4.1 for the calibration sequence of RPM4-AD A160K Q-RPT.
See Section 5.2.4.2 for the calibration sequence of RPM4-AD A350K Q-RPT.
5.2.4.1
A160K Q-RPT CALIBRATION SEQUENCE
The calibration sequence starts with exercising of the Q-RPT(s):
a) Apply vacuum (very low absolute pressure).
b) Dwell for five minutes.
