Fluke PG9000 Series, Руководство по эксплуатации и обслуживанию

Страница: 69 / 202

3. GENERAL OPERATION
Page 59 © 2011 Fluke Calibration
Note
To operate in differential mode and/or execute the RPM offset
determination procedure, the AtmP selection under SETUP must
be external (COM2) (see Section 3.11). If this is not the case, an
error message will be displayed (<Dif mode requires COM2 AtmP
SETUP>) when attempting to activate differential mode.
To select differential mode operation and/or execute the RPM offset determination
procedure, press
[MODE] and select <4dif> , <1run> . The display is:
1. Current value of RPM offset. Always in Pascal
[Pa].
Offset: 9.03 Pa
New offset? 1no 2yes
Select <1no> to use the existing RPM offset and return the previous run screen
in differential mode (see Section 3.10.4.1, Operating in Differential Mode
Note
).
The RPM offset should be redetermined any time the static
pressure value is changed, as well as at the beginning of each
calibration or test sequence. If the difference in the value of the
RPM offset in subsequent determinations is < 0.1 Pa, then less
frequent offset determinations may be considered.
Select <2yes> to proceed with a new determination of the RPM offset. The
display is:
1. Current pressure reading of the RPM in the
current units of.
Set RPM P & [ENT]
96.57785 kPa a
Table 13. Valve Settings for Setting Differential Mode Static Pressure
VALVE VALVE SETTING
Control Selection Static P
PG Shutoff Closed
Test Bypass Open
Static P Selection Off
If static pressure is atmospheric
pressure VENT or OFF
With the Differential Mode Controller valves (see Figure 19) set as indicated
in Table use the system’s pressure control component to set the desired static
pressure value as read by the RPM.
If the desired static pressure is atmospheric pressure (for example, for low gauge
and negative gauge differential pressures), set the STATIC P SELECTION valve
to VENT.
If a REFERENCE VOLUME is connected to the STATIC P port and the desired
static pressure is less than atmospheric pressure, consider setting the STATIC P
SELECTION VALVE to SUPPLY. This will connect the pressure setting vacuum
source directly to the reference volume and reduce pull down time.