DH Instruments E-DWT-H, Руководство по эксплуатации и обслуживанию

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E-DWT-H OPERATION AND MAINTENANCE MANUAL
© 2009 DH Instruments, a Fluke Company Page 52
Note
•
Default stability when using AutoRange is + 0.01% FS of active range
span. Default stability when AutoRanging as part of an AutoTest is
10% of the DUT tolerance (see Section 3.7.5, Table 5).
•
The stability limit is separate and different from the Rate DISPLAY
function (see Section 3.7.7.2) which allows the current rate of change
of pressure to be displayed.

OPERATION
To access the stability setting adjustment, press
[SETUP] , <3stab> . The display is:
Stability limit: Hi
1.0 psi/s
Edit the desired stability limit setting. [ENT] activates the stability limit for the active range
and returns to the main run screen Press [ESC] to return to the MAIN RUN screen with no
change to the stability limit.
Note
The stability setting is range specific. A stability setting made in one
range does NOT affect other ranges.
3.8.4 <4UL> (Upper Limit)
 PURPOSE
To set the upper pressure limit value for a pressure range and measurement mode.

PRINCIPLE
The UPPER LIMIT function provides the user with a settable pressure limit at which an alarm
sounds.
When the limit is reached, RPM4-E-DWT’s beeper sounds intermittently as long as pressure is
above the limit.
The UPPER LIMIT function has two purposes. First, when UL is set to its default value, it serves
as a warning that the maximum pressure of the active range is about to be exceeded. Second,
UL can be set by the user to a value other than the default value to provide an alarm that a
specific pressure limit has been exceeded. This feature is often used to help protect a system to
which RPM4-E-DWT is connected. For example, it might be set just over the full scale of a device
under test (DUT) that is being calibrated. Note that using AutoRange or AutoTest automatically
sets the UL to just above the AutoRange full scale (see Sections 3.7.5, 3.7.11).
Note
The default upper limit is 105 % of AutoRange span or 102 % of Q-RPT
default (maximum) range when AutoTest is used, whichever is lower.
 OPERATION
To view or edit upper limit of the active range press [SETUP] , <4UL> .
The display is:
1. Entry field for upper limit value in active pressure unit of
measure and measurement mode.
Upper limit: Hi
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