User and Programming Manual - Rev H
California Instruments
P Series
May 2000
79
The maximum voltage that the AC source can output is limited by the rms value of the
waveform. This value is defined by the LIMIT subsystem.
Voltage Ranges
The power source has two voltage ranges that are controlled by a relay. The command that
controls the range is:
VOLTage:RANGe 136 | 272
When the range is set to (136), the maximum rms voltage that can be programmed is 136
volts rms, but it is only on this range that the maximum output current rating is available.
The VRANGe command is coupled with the CURRent command. This means that the
maximum current limit that can be programmed at a given time depends on the voltage range
setting in which the unit is presently operating.
Frequency
The output frequency is controlled with the FREQuency command. To set the output frequency
to 50 Hz, use:
FREQuency 50
Current Limit
To set the rms current limit use:
CURRent <n>
where <n> is the rms current limit in amperes.
If the load attempts to draw more current than the programmed limit, The AC source is
programmed to turn off its output if the rms current limit is reached.
Note:
The CURRent command is coupled with the VOLTage:RANGe.This means that
the maximum current limit that can be programmed at a given time depends
on the voltage range setting in which the unit is presently operating. Refer to
"Coupled Commands" for more information.
15.3 Making Measurements
The source has the capability to return current and voltage measurements.
To measure the rms voltage or current, use:
MEASure:VOLTage?
or
MEASure:CURRent?
