PPC3™ OPERATION AND MAINTENANCE MANUAL
© 2002-2007 DH Instruments, a Fluke Company Page 18
3.1.3 DIRECT PRESSURE CONTROL KEYS
Figure 5. Direct Pressure Control Keys
The direct pressure control keys provide direct manual control of pressure increase,
decrease, jog and vent. They can be useful in adjusting pressure when automated pressure
control to a target value is not needed. The jog keys are also used to adjust the target
pressure during active pressure control.
The [
] and [ ] direct pressure control keys interrupt and override automated pressure
control.
Pressing the [VENT] key causes PPC3 to control pressure to near atmospheric pressure and
then open the system vent valve (see Figures 12 and 13). On-going execution of the vent
function is indicated by lighting a RED LED just above the [VENT] key. Completion of the
vent process is indicated by the Ready/Not Ready indicator light becoming GREEN with the
vent RED LED still lighted. The vent valve remains open until the [VENT] key is pressed
again, another direct pressure control key is pressed, or an automated pressure control
command is given.
Pressing the [
] and [ ] direct pressure control keys causes pressure to increase or
decrease at the slow slew rate. Holding the [FAST] key pressed while pressing the [
]
or [
] key causes the pressure increase or decrease speed to change from slow to fast.
Pressing the [
] and [ ] direct pressure control keys causes the pressure to jog or step by
a fixed amount. During active pressure control, they cause the target pressure to be
changed by the fixed amount. One press causes one step. The approximate value of the step
is set automatically depending on the current active PPC3 range. The value can be adjusted
using [SETUP], <3jog> or pressing both the up and down jog keys simultaneously (see
Section 3.4.3).
Pressing the up and down pressure jog keys ([ ] and [ ]) simultaneously is a
shortcut to the jog step size adjustment menu.
3.1.4 REMOTE [ENT/SET P] FOOTSWITCH
The optional remote ENTER function is a switch that duplicates the function of the front panel
[ENT] key. The remote ENTER function is serviced by a connector on the PPC3 rear panel
labeled REMOTE ENTER. An optional footswitch is available to activate remote entry hands
free or a user supplied switch may be used. See Section 7.3 for information on remote
ENTER switch wiring.
The remote ENTER feature can be particularly convenient when running AutoTests
(see Section 3.3.6) in which using a footswitch to [ENT] allows hands free operation.
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