User`s guide

DC Power Supply Operation 3
Remote Sensing
U3606B User’s Guide 115
Remote Sensing
Remote sensing is used to maintain regulation at the load
and reduce degradation of regulation that would occur due
to the voltage drop in the leads between the power supply
and the load. Use remote sensing in applications where load
regulation at the load is critical.
Remote sensing is especially useful in constant voltage mode
with load impedances that vary or have significant lead
resistance. It has no effect in constant current mode.
Because sensing is independent of other U3606B functions, it
can be used regardless of how the U3606B is programmed.
With remote sensing, voltage readback monitors the load
voltage at the remote sense points.
By connecting the power supply for remote voltage sensing,
voltage is sensed at the load rather than at the U3606B
output terminals (+ FORCE –). This will allow the U3606B to
automatically compensate for the voltage drop in
applications with long lead lengths as well as to accurately
read back the voltage across the load.
Refer to Chapter 5, “Characteristics and Specifications,”
starting on page 155 for the maximum allowable voltage
drop on the load wires.
Use twisted or shielded wires to minimize noise pick- up. If
shielded wires are used, the shield should be connected to
the ground at one point, either at the power supply chassis
or the load ground. The optimal point for the shield ground
should be determined by experimentation.
NOTE
During remote sensing setup, it is strongly recommended to power off the
instrument to avoid undesirable damage to the load or the U3606B.
U3606-90054_UG_EN.book Page 115 Friday, July 11, 2014 5:12 PM