6270A
Operators Manual
40
Pressure Control Settings
This section explains the pressure control settings of the Product. Some of these
settings can be accessed on the main screen but all are located in the Control
Settings in the Setup Menu.
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 6. 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. Go to Setup>ControlSetup>
Dynamic Limit and select either a pressure value or a %Range. This entered
value is used for the Ready Tolerance indicator.
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 6, the default dynamic hold limit value is 0.1 % of the target pressure
value. This percentage cannot be changed in the Settings menu.
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
huo016.eps
Figure 6. Dynamic Pressure Control Mode Example
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