PPCK+™ Operation and Maintenance Manual
Page 27
©2001
DH Instruments, Inc
.
Ready/Not Ready When Pressure Control Is Not Active
When automated pressure control is NOT active,
Ready
is indicated whenever the
rate of change of pressure is less than the current stability limit.
3.1.2.6
MULTIPLE PRESSURE RANGES
PPCK+ has one reference pressure transducer (RPT) which has three ranges.
The multi-ranging feature allows measurement uncertainty to be optimized for the
range of pressure in which you are working. Generally, the best range to select (see
Section 3.2.1) is that whose full scale is closest to, but greater than, the maximum
pressure of the device or system under test.
Ranges available can be viewed at any time, but a range change can only be
executed when PPCK+ is vented (see Section 3.1.2.2).
When a range is changed, the upper limit (UL) is automatically changed to the
default for that range or to the last upper limit that was set for that range (see Section
3.2.4). In addition, most other functions and settings are range specific (see Section
3.2.1.1).
Each PPCK+ has three ranges. In general, user settings and operational adjustments
are specific to the range currently in use, as if you had three instruments rather
than one.
Ranges And Identification
The active reference transducer and range is continuously displayed in the upper
right hand corner of the main run screen and most other screens. See Table 1 for a
complete listing of the RPTs available and their ranges.
Hi RPT:
The RPT in a PPCK+ is referred to as the Hi RPT.
Range 1, 2 or 3:
The three ranges of the RPT are referred to as 1 = lo range,
2 = mid range, 3 = hi range.
Table 5.
PPCK+ Range Identification Summary
REFERENCE PRESSURE
TRANSDUCER AND RANGE
DESIGNATION
DISPLAY SYMBOL *
Hi RPT, Lo range
Hi, 1
H1
Hi RPT, Mid range
Hi, 2
H2
Hi RPT, Hi range
Hi, 3
H3
* The display symbol is included in the upper, right hand corner of most PPCK+
menu displays as a convenient indicator of active range.
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