Remote Sense Connections
LETHAL VOLTAGES - Power modules generate output voltages up to 160 VDC! Ensure
that all instrument connections, load wiring, load and sense connections are insulated.
Remote sensing improves the voltage regulation at the load by regulating the voltage there instead of
at the output terminals. This automatically compensates for the load lead voltage drops. Remote
sensing is especially useful for CV operation with load impedances that vary or have significant lead
resistance. It has no effect during CC operation. Because sensing is independent of other power
system functions, remote sensing can be used regardless of how the power system is programmed.
Connect the unit for remote sensing by first removing the jumpers between sense and load terminals. If
you have connected your sense wires as shown under Sense Connections, simply remove the wires
and tape then to the side of the corresponding load wire using electrical tape. This will let you reuse
them in the future. Make your connections as shown in the following figure. Connect the load to the
output terminals using separate connecting wires. Keep the wire-pair as short as possible and twist or
bundle it to reduce lead inductance and noise pickup. Keep load leads under 14.7 meters (50 feet) per
lead because of inductance effects.
Connect the sense leads as close to the load as possible. Keep the sense wire-pair as short as possible
and twist or bundle it to reduce noise pickup. Do NOT bundle the sense wire-pair together with the
load wire pair. Sense wires are normally of a lighter gauge than the load wiring.
Note that any voltage drop due to wire resistance in the sense leads can degrade the output voltage
regulation. As the voltage drop in the load leads increases, the load voltage regulation error due to
sense-lead resistance increases according to the following formula:
Δ V
regulation
= 2(V
load
(R
sense
/S
protect
))
R
sense
is the resistance in ohms of each sense lead.
V
load
is the voltage drop in each load lead.
S
protect
is the internal sense protect resistor (see following table).
The formula assumes that the voltage drop in the +/- load leads are equal.
2 Installing the Instrument
48 Keysight MP4300 Series Operating and Service Guide
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