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3. OPERATION
Page 55 © 2004-2007 DH Instruments, a Fluke Company
OPERATION
To access the stability setting adjustment, press
[SETUP], <3stab>. The display is:
Stability: Hi
0.020 Pa
Edit the desired stability limit setting if desired. [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.
The stability setting is range specific. A stability setting made in one range does NOT
affect other ranges.
3.4.4 <4UL> (UPPER LIMIT)
PURPOSE
To set the upper and lower pressure limit values for a pressure range and measurement mode.
PRINCIPLE
The UPPER LIMIT function provides the user with settable pressure limits at which an alarm
sounds. Absolute and gauge measurement modes (see Section 3.3.3, PRINCIPLE) have
upper limits only. Negative gauge mode and the BA100K also have a lower limit.
When the limit is reached, RPM4’s beeper sounds intermittently as long as pressure is
outside 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 (and lower pressure in negative
gauge mode) 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 an external device or system on which RPM4 is
being used to measure pressure. 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 automatically
sets the UL to just above the AutoRange full scale (see Section 3.3.4).
The default upper limit is 105 % of AutoRange span or 102 % of Q-RPT default (maximum)
range, whichever is lower. The default lower limit (negative gauge mode only ) is – 110 kPa
(- 16 psi), except with the BG15K Q-RPT in which the default lower limit is the negative
equivalent of the upper limit. The default lower limit of the BA100K Q-RPT is 66 kPa (9.6 psi).
In parallel measurement mode (see Section 3.5.7.2), the default and maximum UL is the
UL of the Lo Q-RPT.
In differential measurement mode (see Section 3.3.3.1), UL has upper and lower limits.
The default upper differential UL is the maximum pressure of the Hi Q-RTP. The default lower
UL is the negative value of the upper limit.
In differential measurement mode, the ULs on the Lo Q-RPT and Hi Q-RPT default range are
also active so that line pressure (Lo Q-RPT) and total pressure (Hi Q-RPT) upper limit can be
set and monitored in addition to a differential limit.