RPM4-AD™ OPERATION AND MAINTENANCE MANUAL
© 2005-2007 DH Instruments, a Fluke Company
Page 130
SYMPTOM
PROBABLE CAUSE
SOLUTION
not the ones you want.
Units available under UNIT function is Q-
RPT and measurement mode specific and
current selections do not support desired
unit.
Change active Q-RPT with
[RANGE]
and/or measurement mode with
[MODE]
.
3.3.1, 3.3.3
Front panel display is dim.
Screen saver option has activated.
Operation is normal. Press any key to
resume full screen power. Adjust screen
saver time, if desired. 3.5.5.1
Cannot change active Q-RPT.
Displays “Pressure on Hi (or Lo)
RPT exceeds RR upper limit”.
The pressure currently applied to the Q-RPT
that is being selected exceeds the UL (upper
limit) set for that range.
Reduce pressure applied to test port to
less than UL of target range. 3.4.4
Pressure display is flashing and
beeper is sounding intermittently.
Current upper limit of active Q-RPT has been
exceeded.
Reduce pressure. Change UL and/or
active Q-RPT if needed. 3.4.4
Pressure display is flashing and
beeper is sounding intermittently
while operating in differential
mode.
Differential pressure upper limit OR Hi Q-
RPT upper limit is exceeded.
Reduce differential pressure and/or
pressure on Hi Q-RPT to be less than
upper limit values or change upper limit
value(s). 3.4.4, 3.2.6
Pressure display is NOT flashing
and beeper is sounding
intermittently while operating in
differential mode.
Lo Q-RPT upper limit is exceeded. If Lo Q-
RPT measurement is displayed on second
line, its measured pressures is flashing.
Reduce pressure on Lo Q-RPT or
change its upper limit. 3.4.4, 3.2.6
“Hi (or Lo) RPT EXCEEDED
PMAX” displays alternating with
normal display.
RPM4-AD Q-RPT has been overpressured
(Pmax! exceeded).
Correct the overpressure condition and
cycle power ON and OFF to clear. 0
Rapid beeping for 8 seconds and
<Check RPT connection>
displayed in second line.
RPM4-AD is in parallel measurement mode
and the disagreement in pressure measured
by the two Q-RPTs indicates they may not be
connected in parallel.
If parallel measurement mode is not
desired, change active Q-RPT.
If parallel measurement is desired,
check that the Hi and Lo Q-RPTs are
connected to the same pressure.
Ignore if having the two Q-RPTs on two
different pressures is intentional. 3.2.5
A
Ready
(green
Ready/Not Ready
indicator) indication is never
achieved.
Stability settings is too tight and/or existing
conditions will not allow
Ready
to be
achieved.
Adjust stability setting or correct other
conditions. 3.4.3, 3.2.4
Display update rate of indicated
pressure changes when changing
pressure.
RPM4-AD automated read rate function is
ON to automatically adjust read rate
depending upon rate of change of pressure.
Operation is normal. Turn automated
read rate function OFF if desired. 3.5.7.2
Display update of indicated
pressure is too slow when
pressure is changing quickly.
RPM4-AD automated read rate function is
OFF.
Turn automated read rate function ON to
automatically adjust read rate depending
on pressure rate of change. 3.5.7.2
Pressure is changing but display
of pressure is NOT and the
bottom right hand corner of the
display is a numerical countdown
followed by
<avg>.
Average DISPLAY function is ON and
pressure display is updating only with the
average value at the end of each averaging
cycle.
Go to a DISPLAY function other than
average or press
[+/-]
to get the
instantaneous value Average DISPLAY.
3.3.6
Pressure measurement seems
erratic when measuring gas
pressure.
The RPM4-AD and/or the connection to the
test system is contaminated with liquids.
Purge and clean affected systems.
Contact
DHI
Authorized Service
Provider if RPM4-AD is contaminated
internally. Table 34
Pressure indicated by RPM4-AD
never becomes stable.
These is a leak in the pressure system to
which RPM4-AD is connected.
Find and correct leak. Consider using
RPM4-AD leak check function. 3.3.5
Disagreement between two Q-RPTs
in system appears excessive.
Difference is actually within tolerance and
acceptable disagreement.
Compare differences observed to
tolerances on Q-RPT measurements.
1.2.2.1
Apparently inaccurate pressure
measurement and little or no
response from Q-RPT:
Reference transducer destroyed by
overpressure.
Contact
DHI
Authorized Service Provider.
Table 34
Incorrect pressure units and/or measurement
mode (gauge or absolute).
Set desired pressure units and/or
measurement mode. Consider reference
temperature if unit is inWa. 3.3.2, 3.3.3
Q-RPT calibration coefficients have been
altered.
Check and correct calibration coefficients if
needed. 5.2
Apparent inaccurate pressure
measurement.
AutoZ has been run and turned ON with an
incorrect standard for zero.
Check value of P
offset
. Rerun AutoZ with a
valid reference. 3.5.1
