PPC3™ OPERATION AND MAINTENANCE MANUAL
© 2002-2007 DH Instruments, a Fluke Company Page 142
SYMPTOM PROBABLE CAUSE SOLUTION
The external (RPM4) Q-RPT is not initialized.
Check that the external RPM4 is connected
and initialized properly. 2.3.7, 3.3.5
The Q-RPT range does not cover the desired
AutoRange.
Check that Q-RPT default range is high
enough to cover the AutoRange. Table 1
The specified operating mode is absolute or
negative gauge and absolute mode and
negative are OFF for the desired Q-RPT
Check that the Q-RPT type supports the
desired measurement mode. 3.3.3, 1.2.2.1
AutoRange is not selecting the
desired Q-RPT for the specified
range.
The Q-RPT is Gxxx (gauge only).
Check that absolute/negative gauge is ON
for the Q-RPT. 5.2.5
There is a <C> to the right of the
<D> or <S> control mode
character on the bottom line of the
display and it won’t go away.
The custom control function has been used.
Reset control parameters to default by
selecting a control mode using the
CONTROL function. 3.4.6.2
Pressure display is flashing and
beeper is sounding intermittently.
Current upper or lower limit of active range
has been exceeded.
Correct overpressure condition.
Change UL and/or active range if
needed. 3.4.4, 3.4.4.1
Pressure display is flashing, no
beeper is sounding and direct
pressure control keys are inactive.
PPC3 and/or external RPM4 has been over-
pressured.
Correct the overpressure condition and
cycle power ON and OFF. 3.4.4.1
Display is <Check Xaa aaa RPT,
wdog: nnnnn uuuum> and
pressure control is aborted.
PPC3 internal watchdog measurement
system has detected that active external Q-
RPT does not appear to be connected as its
pressure is not changing as expected when
PPC3 controls the pressure.
Check that external RPM4 Q-RPT is
connected properly to PPC3 TEST(+) port.
Cycle PPC3 power. 2.3.7
A Ready (green Ready/Not Ready
indicator) indication is never
achieved.
Control parameter settings are too tight
and/or existing conditions will not allow
Ready to be achieved.
Adjust control parameters or correct other
conditions. 3.1.3, 3.4.6
Q-RPT is Gxxx (gauge) but cannot
select absolute or negative gauge
measurement mode.
Q-RPT is Gxxx and does not support
absolute and gauge measurement modes or
Operation is normal. 3.3.3
Q-RPT is Axxx (absolute) but
cannot select absolute or negative
gauge measurement mode.
Absolute and negative gauge measurement
mode have been turned off in the calibration
function.
Check that absolute/negative gauge is ON.
5.2.5
Will not accept pressure command. Target exceeds UL and/or current range.
Check UL, range and measurement mode.
3.3.1, 3.3.3, 3.4.4
Pressure and/or vacuum supply incorrectly
connected or not adequate.
Correct pressure and/or vacuum supply.
2.3.5, 2.3.6
Will not set pressure.
There is a very large leak in the test system
or TEST(+) port is not connected.
Correct leak. 2.3.8, 3.3.9
Will not set negative gauge
pressure.
Measurement mode is not negative gauge.
Set negative gauge mode if supported by
Q-RPT. 3.3.3
Vacuum source on EXHAUST port is needed.
Connect vacuum source to EXHAUST port.
2.3.6
Poor pressure control at low
gauge pressure.
Ambient (atmospheric pressure) is too noisy
and/or not consistent on TEST(-) port and DUT.
Connect TEST(-) ports of PPC3, RPM4s if
present and DUT together and consider
isolating from atmospheric pressure. 2.3.8,
2.3.7
Poor pressure control at low
gauge and/or absolute pressure.
ControlRef not properly set to reflect
pressure conditions at EXHAUST port.
Set ControlRef properly. 3.5.7.2
Poor pressure control at very low
gauge pressure.
DVU is needed, particularly if the Q-RPT is a
G15K or BG15K.
Install DVU on TEST(+) and TEST(-) ports.
2.3.8.2
Poor pressure control at pressures
under atmosphere or inability to
reach pressures under
atmosphere.
Vacuum supply is incorrectly connected, is
not low enough or is unstable.
Correct vacuum supply to EXHAUST port.
2.3.6
Poor pressure control characterized
by control interrupting near the
target pressure.
Control mode is set to static mode rather
than dynamic mode.
Set control mode to dynamic. 3.4.6, 3.1.2
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