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Chapter 7 Tutorial
Connecting the Load
148
Warning
To satisfy safety requirements, load wires must be heavy enough not to
overheat while carrying the short-circuit output current of the power supply.
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 E3632A power
supply, 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