PG7000™ OPERATION AND MAINTENANCE MANUAL
© 1998-2008 DH Instruments, a Fluke Company
Page 202
SYMPTOM
PROBABLE CAUSE
SOLUTION
Displays of ambient conditions values
are not accurate.
The reference to which the ambient
condition values are being compared is
not accurate or the specifications of the
ambient conditions sensors are not being
evaluated correctly.
Check the specifications and operation of the
reference being used for ambient conditions.
Consider the specifications of the ambient
conditions measurements. 1.2.1.2
Piston drop rate is excessive.
There is a leak in the pressurized system
or the device under test itself.
Correct leak.
Piston drop rate is excessive
(PG7202).
Liquid lubrication reservoir is empty and gas
is escaping through piston-cylinder gap.
Refill piston-cylinder liquid lubrication reservoir.
5.3.3
Piston rotation rate decay is excessive
(PG7202).
Liquid lubrication reservoir is empty so
piston-cylinder gap is not properly
lubricated.
Refill piston-cylinder liquid lubrication reservoir.
5.3.3
Piston rotation rate decay rate is
excessive.
Piston position detection is out of
adjustment is piston is in spring zone, not
floating freely.
Adjust piston position detection. 5.2.2
Motorized rotation will not engage.
Motorized rotation system recovering from
overload or measurement made is
absolute by vacuum and reference
vacuum is not under ready limit.
Wait 25 seconds for system to recover.
3.9.13, 3.9.8
Automated motorized rotation is not
operating.
Automated motorized rotation is OFF.
Press [ROTATE]. 3.9.8
Manually activated motorized rotation
cutoff while the [
] was still pressed.
Motorized rotation has overloaded or
maximum rotation rate was reached.
Operation is normal. Wait 25 seconds for
system to recover from overload or wait until
rotation rate is below maximum. .9.8
Automated motorized rotation is not
engaging even though rotation rate is
less than minimum
Ready
rotation
rate.
Current mass load is under cutoff
load of 3 kg.
Operation is normal. 3.4.2
Motorized rotation unable to start
piston rotation.
Piston-cylinder dirty.
Clean piston-cylinder. 5.3.1
The piston deceleration function starts
immediately when
[ENTER/SET P]
is
pressed.
Operation is normal but can be modified
so that deceleration does not occur if it is
not needed.
Turn off the PRE-DECEL function. 3.9.8.1
Piston-cylinder dirty, PG7000 Platform not
level, PG7000 subjected to excessive
vibration.
Clean piston-cylinder, level PG7000
Platform, adjust piston position indication,
remove sources of vibration. 2.3.1.1, 5.2.2,
5.3.1
Piston rotation rate slows down too
quickly; motorized rotation engages
too frequently.
Piston position indication is not properly
calibrated and piston is not floating when
rotation engages.
Calibrate piston position indication system.
5.2.2
The mass value loading instruction
resulting from a pressure entry and the
mass value displayed in the MAIN run
screen are not the same.
Mass entries are in nominal mass and
MAIN run screen displays actual mass.
Operation is normal. Familiarize yourself
with PG7000 mass protocol. 3.6
The resolution of mass loading
instructions doesn’t seem correct.
The mass loading resolution setting is set
incorrectly.
Use [RES] to set mass loading resolution as
desired. 3.9.10
Piston position readings seem
incorrect.
Piston position reading system needs to
be adjusted; mass bell is not loaded so
piston position indication is not operating.
Execute piston position reading adjustment
procedure, load mass bell. 5.2.2
Pressure defined by PG7000 is grossly
incorrect.
Active piston-cylinder module and/or mass
set are not those that are in use, the
correct mass value is not loaded.
Select correct piston-cylinder module and
mass set; check mass load accounting. 3.6,
3.9.2, 3.11.1.10
Pressure defined by PG7000 is
incorrect by roughly 100 kPa (14.5 psi).
PG7000 is in absolute measurement mode
when it should be in gauge measurement
mode or vice-versa.
Use [MODE] to select correct measurement
mode. 3.9.4