Agilent Technologies E3634A, E3633A manual Stability, Remote Voltage Sensing Connections

Chapter 3 Front-Panel Operation

Remote Voltage Sensing at the Front and Rear Terminals

Stability

Using remote sensing under certain combinations of load lead lengths and large load capacitances may cause your application to form a filter, which becomes part of the voltage feedback loop. The extra phase shift created by this filter can degrade the power supply’s stability, resulting in poor transient response or loop instability. In severe cases, it may cause oscillations. To minimize this possibility, keep the load leads as short as possible and twist them together. As the sense leads are part of the power supply’s programming feedback loop, accidental open-connections of sense or load leads during remote sensing operation have various unwanted effects. Provide secure and permanent connections.

	Remote Voltage Sensing Connections
	Connections between the power supply sensing and output terminals should
	be removed, and using shielded two-wire cable, the power supply sensing
	terminals should be connected to the load as shown in Figure 3-2. Do not use
	the shield as one of the sensing conductors and the other end should be left
	unconnected. Connect one end of the sensing lead shield to the chassis ground
	(^) only. Opening a sensing lead causes the power supply output voltage to
	decrease at the load leads. Observe polarity when connecting the sensing leads
	to the load.
	For local voltage sensing connections, the (+) and (-) sense terminals must be
	connected to the (+) and (-) output terminals respectively.
N o t e	When you make the remote voltage sensing connections at the front or rear panel
	terminals, make sure to disconnect all the connections to the load and sense leads
	at the other end terminals. Do not make the sensing connections at both front and
	rear terminals at the same time. It will cause to damage the power supply seriously.

Figure 3-2. Remote Voltage Sensing Connections

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