RPM4™ OPERATION AND MAINTENANCE MANUAL

3.3.8.1SDS IN DIFFERENTIAL AND PARALLEL MEASUREMENT MODES

In differential and parallel measurement modes, opening SDS opens SDS for BOTH the Hi and Lo Q-RPTs. Before opening SDS, be certain that the pressure applied to both the Hi and Lo RPM4 TEST(+) ports is less than the maximum pressure of the Lo Q-RPT.

Differential (see Section 3.3.3.1) and parallel measurement modes (see Section 3.5.7.3) use two Q-RPTs in one RPM4 to simultaneously. In these modes, function of the [SDS] key is adapted to facilitate operation using both Q-RPTs simultaneously. [SDS] can be used to OPEN SDS on both the active an inactive Q-RPTs at the same time.

Pressing [SDS] always CLOSES any ON and OPEN SDS, as it does in single Q-RPT mode operation. However, if SDS is CLOSED for any and all modules equipped with SDS, pressing SDS goes to the usual OPEN SDS routine which will OPEN SDS for both Q-RPTs.

The display is :

1.Maximum acceptable pressure of the Lo Q-RPT (always absolute on an Axxx Q-RPT and gauge on a Gxxx Q-RPT).

2.Position designator of active Q-RPT. <HL> in parallel mode, <Hd> in differential mode.

Pmax! 350 kPa a HL Open Hi&Lo? 1no 2yes

Check that the pressure applied to BOTH the TEST(+) ports does NOT exceed the maximum acceptable value for the Lo Q-RPT. Select <1no> to return to the main run screen without OPENING SDS, select <2yes> to OPEN SDS for both Q-RPTs and return to the main run screen with SDS OPEN (the active Q-RPT open to the TEST(+) port).

3.3.9 [AU T O Z]

PURPOSE

To run the AutoZ function that rezeros the active Q-RPT between full calibrations.

See Section 3.5.1,  Principle for a full explanation of the AutoZ function.

PRINCIPLE

Run AutoZ is the function by which the current Q-RPT reading is compared to a reference, Pstd,0, at atmospheric pressure to determine a new value of Poffset. The value of Poffset is then used by AutoZ to automatically correct the Q-RPT for possible changes in zero over time (see Section 3.5.1,  PRINCIPLE).

Running AutoZ in parallel mode (see Section 3.5.7.3) autozeros the Hi and Lo Q-RPTs simultaneously and independently. There is are no Zoffset values specific to the HL Q- RPT.

See Section 3.3.9 to run AutoZ.

© 2004-2007 DH Instruments, a Fluke Company

Page 46

Page 56
Image 56
Fluke RPM4 manual Au T O Z, SDS in Differential and Parallel Measurement Modes, Pmax! 350 kPa a HL Open Hi&Lo? 1no 2yes