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Menu 4
4-11
Slew Rate
User defined maximum pressure rate of change. The Calibrator is designed to control
with minimum overshoot into a wide variety of external volumes at its highest slew rate.
Therefore, in most applications it is recommended that the slew rate be set at its
maximum rate value. This provides the highest speed control without jeopardizing
overshoot or control stability properties. The only application where the operator may
wish to slow down the slew rate (control speed) is in applications where the device under
test could be damaged by high rate of pressure change. The Calibrator control algorithm
tries to limit the rate of pressure change to the slew rate. On Calibrator’s will full scale
pressures ranges less than 10 psi (70 kPa), it is common to reduce the slew rate to less
than 25% of full scale to improve on control overshoot characteristics.
Slew Limit
The slew limit is used by the system to assure that the slew rate is not exceeded. If the
slew rate is exceeded, the Calibrator will change from the control mode to the measure
mode and it will generate an error message to the operator.
Access
The test access password allows the user to protect access to Calibrator configuration and
programs. If the test access password is set to any number other than zero (factory
default), it is required before the user is allowed to change the limits, control parameters
or programs.
Note
It is recommended that the access password be recorded and filed in a
secure location.
Menu | Setup — User
The Menu | Setup | User menu is used to setup all of the user specific configurations.
This includes setting the control step size, range of bar-graph, pressure gas head, display
pressure filter, display resolution digits, and audible key click.
gld13.bmp
Figure 4-11. Menu | Setup | User - Menu