DH Instruments PPCK PLUS, Руководство по эксплуатации и обслуживанию

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PPCK+™ Operation and Maintenance Manual
©2001 DH Instruments, Inc .
Page 18
11. Indicates whether the number following is target pressure <T> , rate of change of pressure <R> or
current deviation from target value <D> ) (see Section 3.2.3).
Target pressure <T> is indicated when:
•
Dynamic control is active and pressure is Not Ready .
•
Static control is active and pressure is outside of the hold limit.
Deviation <D> is indicated when:
•
Dynamic control is active and pressure is Ready .
Rate of change <R> is indicated when:
•
No control is active (e.g., control is suspended or system is vented).
•
Static control is active, and pressure is inside the hold limit.
PPCK+ has a screen saver function which causes the display to dim if no key is pressed for
10 minutes. Pressing a key restores full power to the display. The screen saver time can be
changed or screen saving can be completely suppressed
( see Section 3.4.4.8).
3.1.2 GENERAL OPERATING PRINCIPLES
3.1.2.1 KEYPAD LAYOUT AND PROTOCOL
The PPCK+ has a 4 x 4 keypad for local operator access to direct functions, function
menus and for data entry.
1. The Function/Data keys allow very
commonly used functions to be accessed
directly by a single keystroke when
pressed from the main run screen. The
name of the function is on the bottom half
of the key (see Sections 3.1.2.7, 3.2).
These keys enter numerical values when
editing.
2. The Editing and Execution keys are for
causing execution, suspending execution,
backing up in menus and editing entries.
3. The Menu/Data keys provide access to
function menus when pressed from the
main run screen. The menu name is on
the bottom half of the key. The SETUP
menu is for more frequently used functions
(see Section 3.3). The SPECIAL menu is
for functions that are not generally used as
a part of day to day operation (see Section
3.4). These keys enter numerical values
when editing.
Figure 3. Keypad Layout