Chapter 7 Tutorial
Connecting the Load
142
Remote Voltage Sensing
Normally, a power supply operating in the constant voltage mode achieves its
optimum line and load regulations, its lowest output impedance, drift, and ripple and
noise, and its fastest transient recovery performance at the power supply output
terminals. If the load is separated from the output terminals by any lead length, some
of these performance characteristics will be degraded at the load terminals - usually
by an amount proportional to the impedance of the load leads compared with the
output impedance of the power supply.
With remote voltage sensing, a feature included in the Agilent E3633A and E3634A
power supplies, it is possible to connect the input of the voltage feedback amplifier
directly to the load terminals so that the regulator performs its function with respect
to the load terminals rather than with respect to the power supply output terminals.
Thus, the voltage at the power supply output terminals shifts by whatever amount is
necessary to compensate for the voltage drop in the load leads, thereby maintaining
the voltage at the load terminals constant.
Figure 7-7. Regulated Power Supply with Remote Sensing
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