2 Installation
36 Keysight N6700 User’s Guide
Remote Sense Connections
Turn off AC power before making or changing rear
panel connections.
Remote sensing improves the voltage regulation at the load by
monitoring the voltage there instead of at the output terminals. This
allows the power system to automatically compensate for the voltage
drop in the load leads. 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 disconnecting the straps
between sense and load terminals. 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. Do NOT bundle
the sense wire-pair together with the load leads; keep the load wires and
sense wires separate. Note that the sense leads carry only a few
milliamperes of current and can be a lighter gauge than the load leads.
However, note that any voltage drop in the sense leads can degrade the
voltage regulation of the instrument. Try to keep the sense lead
resistance less than about 0.5Ω per lead (this requires 20 AWG or
heavier for a 50 foot length).
Note that Keysight Models N678xA SMU require remote sensing when
using any of the High output bandwidth modes discussed in Chapter 4.
Also, these models have additional wiring restrictions as discussed under
“Keysight N678xA SMU Wiring Requirements”.
When remote sensing on power modules with the 50A sense connector,
do not connect the +LS and –
LS terminals. These are dedicated for local
sensing only.
+S + -S
TWIST
LEADS
LOAD
+
+
LOAD
+
50
A SENSE
TWIST
PAIR
50
A
CONNECTOR
12A
&
20 A
CONNECTOR
TWIST
PAIR
+S
+LS
-
LS -
S
- -
G + + +
S
G
-
S
LOAD
+
TWIST
LEADS
8A CONNECTOR
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