DH Instruments PPCH, Руководство по эксплуатации и обслуживанию

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PPCH™ OPERATION AND MAINTENANCE MANUAL
© 2009 DH Instruments, a Fluke Company Page 46
When an RPM4 is initialized as an external device to a PPCH pressure controller, the RPM4
front panel keypad is locked out and the second line of the display becomes:
<PPCH EXT DEV: IDLE> (if RPM4 is initialized by PPCH but not currently in use)
<PPCH EXT DEV: ACTIVE> (if RPM4 is initialized by PPCH and is currently in use)
After using an RPM4 as an external device for a PPCH, cycle power to return to the previous
RPM4 settings, restore front keypad capability and return to the normal MAIN RUN screen.
Some screens, such as the RPT identification screen, go beyond the two lines provided by
the display. Press the cursor control keys to move the cursor to access the lines that are not
visible or directly enter the number of the hidden menu choice if you know it.
The third line is not included if no 2
nd
(X2) RPM4 is detected.
3.3.6 [AUTOTEST]
 PURPOSE
To execute a programmed sequence of automated pressure control target values and/or to
AutoRange the PPCH based on the full scale and tolerance of the device under test.
 PRINCIPLE
The AutoTest function is intended to facilitate the execution of a series of pressure control
target values such as is commonly needed when PPCH is used to run a calibration sequence
on a device or system being tested.
There are two types of sequences:
Quick Test
Allows quick definition and execution of a sequence
in
the current range and using all of the current
settings
(pressure unit of measure, measurement
mode, control mode, control settings, display resolution).
Quick DUT Test (QDUT) AutoRanges PPCH based on the full scale and
tolerance of a device under test
, prompts the user
through the increments of a calibration sequence and
logs calibration data. The first portion of the QDUT
function can be used alone to automatically set
PPCH
range and operating characteristics appropriately for the
device under test. The sequence function assumes that
the pressure at each target point will be adjusted so that
the device under test reads a cardinal target pressure point.
This is particularly useful when calibrating analog gauges.
Test sequences are defined by the minimum pressure, maximum pressure and test
increment in % of full scale. For tests, in gauge mode, the minimum pressure is always zero.
For tests in absolute mode, the minimum pressure is defined by the user.
 OPERATION
To run an AutoTest press
[AutoTest]
from the MAIN RUN screen.
The display is:
Run an AutoTest: IH
1Quick 2QDUT
Select the test type desired. See Section 3.3.6.1 for Quick Test or Section 3.3.6.2 for QDUT Test.