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Automated Pressure Calibrator
Pressure Control Settings
39
Control Modes
The Product offers two different control modes to control pressure:
• Dynamic mode sets the target pressure and constantly adjusts to maintain
the target.
• Static mode sets the target pressure and stops controlling, adjusting only
when the measured pressure has exceeded specific limits.
The subsequent sections give more information on each mode.
Dynamic Control Mode
Dynamic Control sets the pressure to the target value and then controls pressure
to keep it at the Setpoint value, see Figure 11. Dynamic Control is beneficial for
most applications because it automatically compensates for changes to the
system from adiabatic affects and small leaks. Dynamic Control is the default
control mode when the Product is turned on.
Note
Dynamic Control generates a very small amount of pressure noise
due to continuous pressure control. The pressure noise is
undetectable in most UUTs. For high-end sensitive UUTs where
pressure noise is a concern, use Static Control for the test.
In Figure 11, the default dynamic ready tolerance value is 0.1 % of the target
pressure value.
APPLIED PRESSURE
Time
Dynamic Pressure Control
Target
pressure
set
Rate of pressure
decreased to
prevent overshoot
Product continuously makes
pressure changes to keep
pressure as close to the
target pressure as possible
Ready Tolerance
hwr040.eps
Figure 11. Dynamic Pressure Control Mode Example
The upper and lower dynamic ready tolerance 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.
1.888.610.7664 sales@GlobalTestSupply.com
Fluke-Direct.com
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