Fluke 6270A - Static Control Mode

Pressure Controller/Calibrator
Pressure Control Settings
41
The upper and lower dynamic hold limit for a target value of 2,000 psi is 2 psi
(2,000 psi x 0.1 % = 2 psi).
The Product keeps the pressure stable between 1998 psi and 2002 psi.
Static Control
Mode
Static Control sets the pressure slightly above the target pressure value and then
turns off active pressure control, see Figure 7. The pressure is allowed to
naturally settle until it exceeds the lower or upper hold limit. This pressure control
sequence repeats until the target pressure is changed or the test is complete.
The advantage of this 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
hold limits and the rate of change of pressure is less than the stability limit.
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
huo017.eps
Figure 7. Static Pressure Control Mode 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.