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2271A
Operators Manual
40
Static Control
Mode
Static Control sets the pressure slightly above the target pressure value and then
turns off active pressure control, see Figure 12. The pressure is allowed to
naturally settle until it exceeds the lower or upper ready tolerance. This pressure
control sequence repeats until the target pressure is changed or the test is
complete.
Target Pressure
APPLIED PRESSURE
Time
Static Pressure Control
Upper Control Limit
Lower Control Limit
+
-
Control
Limit
Target
pressure
set
Rate of
pressure
decreased
to prevent
overshoot
Pressure
control
stops
Pressure
gradually
decreases
Pressure
hits Control limit
and controlled
up to
target pressure
hwr041.eps
Figure 12. Static Pressure Control Mode Example
The advantage of Static Control mode is that pressure can be set and measured
without noise from the pressure control system. Static Control shows in the user
interface as Static. A Ready indication is predicated on pressure being inside the
ready tolerance and the rate of change of pressure is less than the stability limit.
As an example, the upper and lower control limit for a target value of 2,000 psi is
manually set to 5 psi. The Product keeps the pressure stable between 1995 psi
and 2005 psi.
Control Limits (Only for Static Control)
Use Control limits to set an upper and lower pressure limit around the Setpoint.
These limits are only used with the Static Control mode. The default value is
0.1 psi. The Product will not let the pressure go above or below the user-defined
limits.
Stability Limit (Only for Static Control)
The Stability limit defines the stability at which the measurement indicator shows
“Ready”. Use Stability Limit only with Static Control mode.
1.888.610.7664 sales@GlobalTestSupply.com
Fluke-Direct.com
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