6270A
Operators Manual
42
Control Limits (Only for Static Control)
Control limits are used 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. See Static Control and Control Limits for more information.
Stability Limit (Only for Static Control)
Stability Limit is used only with Static Control mode. The limit defines the stability
at which the measurement indicator shows Ready.
Slew Rate (Rate of Pressure Change)
Slew Rate is a user-defined maximum pressure rate of change. The Product
controls this pressure with minimum overshoot into a wide variety of external
volumes at its highest slew rate. In most applications Fluke Calibration
recommends that the slew rate be set at its maximum rate value. This provides
the highest speed control without jeopardizing overshoot or control stability
properties. In applications where the device under test could be damaged by high
rate of pressure change, it can be necessary to slow down the slew rate (control
speed). The Product control algorithm limits the rate of pressure change to the
slew rate. On calibrators with full-scale pressures ranges <70 kPa (10 psi), it is
common to reduce the slew rate to <25 % of full scale/min to improve on control
overshoot characteristics.
Safety Limits
The Product has user-configurable safety limits that protect (UUT) from being
inadvertently over-pressured. See below for more information on each limit.
(Setup>Control Setup>Safety Limits)
Upper Limit
The upper limit is a safety limit that protects the UUT from being inadvertently
over-pressured. The upper limit is typically set just over the full-scale pressure of
the UUT. If a Setpoint greater than the user-defined upper limit is entered, the
Product does not accept the value and generates an error code. While in Control
mode, if pressure exceeds the user-defined limit, the Product changes to the
Measure mode and again shows an error message.
Lower Limit
This is the same as the high limit except it protects the UUT from low pressure
limits.
Auto Vent
This is the defined maximum pressure that the Product can reach prior to venting
the test port to atmosphere.
Pressure Measurement Settings
The Pressure Measurement menu contains all options and parameters related to
how the Product measures pressure. See the subsequent sections for more
information on each setting.
To Next Page
Loading...
