Front-Panel Operation 3
Keysight E3633A and E3634A User’s Guide 67
Remote Voltage Sensing at the Front and Rear Terminals
Remote voltage sensing is used to maintain regulation at the load and reduce the
degradation of regulation that would occur due to the voltage drop in the leads
between the power supply and the load.
By connecting the power supply for remote voltage sensing, voltage is sensed at
the load rather than at the power supply’s output terminals. This will allow the
power supply to automatically compensate for the voltage drop in applications
with long lead lengths as well as to accurately read back the voltage directly
across the load.
When the power supply is connected for remote sensing, the OVP circuit senses
the voltage at the sensing points (load) and not the output terminals.
CV regulation
The voltage load regulation specification in chapter 8 applies at the output
terminals of the power supply. When remote sensing, add 5 mV to this
specification for each 1V drop between the positive sensing point and (+) output
terminal due to the change in load current. Because the sense leads are part of
the power supply’s feedback path, keep the resistance of the sense leads at or
below 0.5Ω per lead to maintain the above specified performance.
Output rating
The rated output voltage and current specifications in chapter 8 apply at the
output terminals of the power supply. With remote sensing, any voltage dropped
in the load leads must be added to the load voltage to calculate maximum output
voltage. The performance specifications are not guaranteed when the maximum
output voltage is exceeded. If the excessive demand on the power supply forces
the power supply to lose regulation, the Unreg annunciator will turn on to indicate
that the output is unregulated.
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