OUTPut:DROP
The output drop command may be used to interrupt the voltage to the UUT without opening
the output relay. This method uses an electronic means of interrupting the AC source output
which enables short interruptions of as little as 1 ms or as long as 4000 s.
In addition to short interruption times, the drop command can be set to use any of four start
phase angles at which to execute the voltage drop.
The parameter passed with the OUTP:DROP command is the drop duration in seconds.
This value can range from 0.001 ( 1 ms) to 4000 ( 1 hour, 6 minutes, 40 seconds) but only
four digits of resolution are allowed. If no parameter is passed, the output is dropped
indefinitely or until a voltage command is issued. Thus valid times are:
Infinite time. Use VOLT command to turn output on.
Phase Selection
Phase selection is available for the Output Drop command. Thus, any specific phase may be
selected for phase loss test applications or all three phases. The INSTrument:COUPle and
INSTrument:NSELect command may be used to select all three phases or any individual
phase. Phase angle programming always applies to phase A. Phase B and C have fixed
phase offsets with respect to phase A.
Example: Turing on output voltage at a specified phase angle for all phases
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
INST:COUP 1 Couple all output phases
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 Put AC source in infinite drop mode
/* Turn on sequence
VOLT 230 Turn on voltage to 230 V at 90 degrees
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