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Programming the DC Source - 5
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Oscillation Protection
Oscillation protection is a built in function that shuts down the output in about 10 milliseconds if a
persistent and severe oscillation condition is detected. Oscillation protection can be enabled or disabled
using the following command:
OUTP:OSCP <bool>,(@<channel list>) where <bool> is the protection state (0 | OFF | 1 | ON).
If the output of your unit is being shut down by the oscillation protection circuit, you can reprogram the
output compensation bandwidth to try and eliminate the oscillation. This can be especially effective if
capacitive loads or long load leads are causing the output to oscillate. You can program the output
compensation to operate in a lower bandwidth using the following command:
VOLT:ALC:BWID <n>,(@<channel list>) where <n> is one of 3 bands (30000 | 20000 | 10000)
If your unit is being operated in current limit, your can select from one of two compensation bands using
the following command:
CURR:LIM:BWID <n>,(@<channel list>) where <n> is one of 2 bands (30000 | 10000)
NOTE: If the output is on, programming a different compensation band will cause the output to cycle
OFF, then ON.
Triggering Output Changes
The dc source has two independent trigger systems. One is used for triggering output changes, and the
other is used for triggering measurements. This section describes the output trigger system. The
measurement trigger system is described under "Triggering Measurements". Briefly, to generate an
output trigger:
1 Program the triggered output level (voltage, current , or current limit)
2 Set the triggered function mode to STEP
3 Initiate the trigger system
Output Trigger Model
Figure 5-1 is a model of the output trigger system. The rectangular boxes represent states. Arrows show
the transitions between states. Arrows are labeled with the event that causes the transition to occur.
OUTPUT CHANGES
INITIATED STATE
IDLE STATE
ABOR
*RST
TRIGGER RECEIVED
INITiate:NAME TRAN
Figure 5-1. Model of Output Trigger System