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Chapter 7 Tutorial
Connecting the Load
154
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