3. OPERATION

3.5.7 <7INTERNAL>

PURPOSE

To view, set, adjust, and maintain various aspects of RPM4’s internal operation.

OPERATION

To access the internal selections press [SPECIAL], <7internal>. The display is:

The INTERNAL menu choices include:

1baro 2ReadRt 3RPT2x 4lo vnt 5log

<1baro>

View the real time output of the on-board barometer, if present (see Section

 

3.5.7.1).

<2ReadRt>

Turn ON and OFF RPM4’s automated, rate of change dependent, reading

 

integration rate feature (see Section 3.5.7.2).

<3RPT2x>

Enable and disable RPM4 parallel measurement mode in which two Q-RPT

 

modules are used to measure in parallel and their readings are averaged

 

(see Section 3.5.7.3).

<4lo vnt>

Operate Q-RPT module Gxxx and BGxxx low VENT valve directly

 

(see Section 3.4.7.4).

<5log>

View the RPM4 incident log (see Section 3.5.7.5).

3.5.7.1<1BARO>

PURPOSE

To view the value of atmospheric pressure as measured by the RPM4 on-board barometer.

There is no on-board barometer in RPM4’s that have Gxxx (gauge) internal Q-RPTs only.

PRINCIPLE

RPM4’s that include an Axxx (absolute) and/or BGxxx (bi-directional gauge) Q-RPT are equipped with a separate, on-board barometer. The atmospheric pressure measurements made by the on-board barometer are used for dynamic compensation of atmospheric pressure when using an Axxx Q-RPT to make gauge pressure measurements (see Sections 3.3.3,  PRINCIPLE and 3.2.2) and for static pressure compensation when using a G15K or BG15K Q-RPT.

See Section 5.5, Figure 7 and Section 5.6, Figure 8 for a photo and schematics showing the position of the on-board barometer in RPM4.

The on-board barometer is a low accuracy sensor used only for measuring small changes in atmospheric pressure over short periods of time (see Section 3.2.2) and for line pressure compensation when using a G15K or BG15K Q-RPT. RPM4 measurement uncertainty does not depend on the measurement uncertainty of the on-board barometer.

Page 73

© 2004-2007 DH Instruments, a Fluke Company

Page 83
Image 83
Fluke RPM4 manual 7 7INTERNAL, 7.1 1BARO, 1baro 2ReadRt 3RPT2x 4lo vnt 5log