Ametek 2003RP, User And Programming Manual

Page: 116 / 126

Turning on output voltage for all three phases at a specified phase angle
The following command sequence will turn the output voltage on at a specified phase angle.
This may be required to measure worst case inrush current.
/* Set up sequence
VOLT 0
Set output voltage to zero
OUTP 1 Close output relay
INST:COUP 1 Select all phases
OUTP:STAR:STAT 1 Enable start phase mode
OUTP:STAR:PHAS 90 Set start phase angle to 90 degrees
OUTP:DROP Put AC source in infinite drop mode
VOLT 230 Turn on voltage to 230 V at 90 degrees
Individual Phase Loss Test
The following command sequence will drop the output of phase A only for 10 cycles at 400
Hz.
/* Set up sequence
VOLT 115;FREQ 400
Set output voltage to 115 V at 400 Hz (all phases)
INST:COUP 0 Uncouple output phases
INST:NSEL 1 Select phase A
OUTP 1 Close output relay
OUTP:STAR:STAT 1 Enable start phase mode
OUTP:STAR:PHAS 90 Set start phase angle to 90 degrees on phase A
OUTP:DROP 0.025 Drop for 25 ms (10 cycles @ 400 Hz)
Current Limit
To set the RMS current limit use (
where <n> is the RMS current limit in amperes
):
CURRent <n>
If the load attempts to draw more current than the programmed limit, the AC source will
attenuate its voltage to maintain the output current at the programmed level.
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.
11.3 Making Measurements
The source has the capability to return current, peak current, crest factor, true power,
apparent power, power factor and voltage measurements for any of the three output phases.
The INST:NSEL command must be used to select phase A (1), B (2) or C (3). Once a phase
has been selected, it remains selected until the next INST:NSEL command is issued.
Note: The INST:COUP command has no effect on the phase selection for
measurements.
Voltage Measurement
To measure the RMS voltage, use:
OUTP 1 /* Close output relay if it was not closed already.
INST:NSEL 1 /* Select phase A
MEAS:VOLT? /* Query output voltage measurement
Current Measurements