Weidmuller Portacal 1000 - Instrument Calibrator - Manual (Page 4)

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In addition, it has four special functions:
1. Two wire test, which powers a loop powered transmitter and
monitors its output level.
2. Automatic ramp/step, which ramps or steps through a selection of
the values stored for the operating mode at a user defined interval.
3. External Voltage measurement, for monitoring analogue voltage
signals
4. External Current measurement, for monitoring analogue milliamp
current signals
Stored values
For each output mode there are nine memory locations for your
favourite calibration points. In addition, most commonly used values
are available by pressing one key.
Continuous Ramp/Step function
You can set the Portacal 1000 to repeatedly ramp or step between
up to nine stored values in any output mode with programmable time
delay.
Error messages
The display will flash when the battery is low. It also shows the
following messages:
SHrt - short circuit output for voltage outputs
OPEn - indicates open circuit output for current outputs
-OL- - indicates that the output is overloaded