Agilent Technologies N3280A manual Triggering Output Changes, Oscillation Protection

Programming the DC Source - 5

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:

1Program the triggered output level (voltage, current , or current limit)

2Set the triggered function mode to STEP

3Initiate 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.

	ABOR
IDLE STATE
	*RST

INITiate:NAME TRAN

INITIATED STATE

TRIGGER RECEIVED

OUTPUT CHANGES

Figure 5-1. Model of Output Trigger System

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