PG7000™ OPERATION AND MAINTENANCE MANUAL
© 1998-2008 DH Instruments, a Fluke Company
Page 64
High line differential mode operation includes:
•
Entering differential mode (see Section 3.9.4.2, Entering High Line
Differential Mode ([MODE], <3HLdif>, <1run>)).
•
Setting a line pressure (see Section 3.9.4.2, Setting a Line Pressure
([MODE], <3HLdif>, <1run>, <2yes>)).
•
Setting differential pressures at a high line pressure (see Section 3.9.4.2,
Setting Differential Pressures at a High Line Pressure).
•
Viewing current line pressure and natural fall rates for the line pressure (see
Section 3.9.4.2, Viewing Line Pressure, Starting Piston-Cylinder
Temperatures and Natural Piston Fall Rates ([MODE], <3HLdif>, <2view>).
Entering High Line Differential Mode ([MODE], <3HLdif>, <1run>)
To enter high line differential mode, press
[MODE]
,
<3HLdif>
,
<1run>
on the
reference
PG7000’s PG Terminal.
The
reference
PG7000 initializes high line differential mode. To successfully enter
high line differential mode the
reference
PG7000 must be able to communicate
with the
tare
PG7000, the piston-cylinders in both PG7000s must be nominally
identical and the piston-cylinder in the tare PG7000 must have a non-zero value
for k(P) in its piston-cylinder module file. When initializing high line differential
mode, the
reference
PG7000 tests for these conditions and provides error
messages as follows:
•
<Cannot find PG7000 on COM2>
: COM2 of the
reference
PG7000 must be
connected to COM1 of the
tare
PG7000 using a valid RS232 cable and both
interfaces must be properly set so that communications between the two
PG7000s can occur (see Sections 3.11.5.1, 3.11.5.4). If the
reference
is
unable to communicate with the
tare
, this error message is displayed. If this
error message is observed, correct the communications problem and retry
(see Section 3.11.5.1).
•
<T & R PCs not a pair, cannot run HLdif>
: The piston-cylinder modules in
the two PG7000s must be nominally identical (have the same nominal mass
to pressure conversion coefficient). If the
reference
PG7000 finds the two
piston-cylinder modules to be different, this error message is displayed.
If this error message is observed, correct the situation by changing piston-
cylinder selection or adjusting one piston-cylinder’s definition (see Sections 3.9.2,
3.11.1.2).
•
<No T PC in T PG7000, cannot run HLdif>
: The piston-cylinder module
selected in the tare PG7000 must have a non-zero value for k(P) in the
active piston-cylinder module file. If the k(P) value is zero, this error
message is displayed. If this error message is observed, correct the
situation by providing a non-zero value for k(P) in the piston-cylinder module
file of the tare piston-cylinder (see Section 3.11.1.2).
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