DH Instruments PPC3 - 2 Remote

3. OPERATION
Page 63 © 2002-2007 DH Instruments, a Fluke Company
To access run AutoZ, press [SPECIAL], <1AutoZ>, <4run>. If the current
measurement mode is gauge, a message indicating that AutoZ cannot be run
manually in gauge mode is displayed.
Allow the PPC3 to stabilize at atmospheric pressure and ambient
temperature for 10 to 15 minutes before running AutoZ.
If the current measurement mode is absolute, the display is:
1. Real time reading (without head correction),
pressure unit of measure and measurement
mode of the active Q-RPT.
2. Active Q-RPT position designator.
3. Entry field for the value of P
std,0
. in the current
pressure unit of measure.
96.7755 kPa a X1H
Pstd,0:0.00000
Enter the value of the AutoZ reference (P
std,0
) in the same unit of measure as the
top line display and press [ENT]. PPC3 logs the readings and calculates a new
AutoZ offset value. The next display is:
Press [ENT] to activate the new value of
P
offset
or [ESC] to start over with entry of a
new AutoZ reference (P
std,0
) value.
Old P
offset
: 0.0 Pa
New P
offset
: 8.3 Pa
While the value of P
std,0
is entered in the current pressure unit of measure,
the value of P
offset
is always in Pascal (Pa). .
If running AutoZ results in a value of P
offset
that is greater than ± 0.005 % FS of
the span of the Q-RPT that is being AutoZeroed, the Q-RPT and/or the reference
used as the source of Pstd,0 may be out of tolerance or the AutoZ process may
have been faulty. Before activating a new P
offset
greater than ± 0.005 % FS of
the active Q-RPT, check to be sure that both the Q-RPT and the reference were
in good working order, properly vented to stable atmospheric pressure, at the
same height, and reading in the same pressure units when AutoZ was run.
When running AutoZ, if a HEAD correction is currently active (see Section 3.3.7),
it is momentarily disabled to avoid “zeroing out” the head value.
3.5.2 <2REMOTE>
 PURPOSE
To configure the PPC3 COM1, COM2 and IEEE-488 (GPIB) communication ports. To test
COM1 and COM2 communications. To select remote programming communications format.
 PRINCIPLE
The PPC3 has two RS-232 communications ports referred to as COM1 and COM2 and a
single IEEE-488 (GPIB) port. COM1 or the IEEE-488 port is for communicating with a host
computer (see Section 4), and COM2 is reserved for communicating with an external device
(i.e. an RPM4, a multimeter, etc.). These ports’ settings can be viewed and changed using
[SPECIAL], <2remote>.