Remote Sense Connections - Agilent Technologies Series N6700 User Manual

2 Installation

Remote Sense Connections

WARNING
8A CONNECTOR
- - G + + +S G -S
TWIST
LEADS
+
LOAD
CAUTION
36
SHOCK HAZARD 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.
+S + -S
TWIST
PAIR
+
LOAD
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 Agilent 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 "Agilent 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.
12A & 20 A
+
CONNECTOR
TWIST
LEADS
+
LOAD
50 A
CONNECTOR
50A SENSE
+S +LS -LS -S
TWIST
PAIR
Series N6700 User's Guide