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Multiple Loads
1. Twist leads
2. 4-wire
disabled
(indicator
is off)
4-Wire Sense Connections
Model N6705 User's Guide
If you are connecting multiple loads to one output, connect each load
to the output terminals using separate connecting wires as shown.
2
+
This minimizes mutual coupling effects and takes full advantage of
the DC Power Analyzer's low output impedance. Keep each pair of
wires as short as possible and twist or bundle them to reduce lead
inductance and noise pickup. Keep the load leads under 14.7 meters
(50 feet) per lead because of inductance effects.
Agilent Models N678xA SMU have additional wiring restrictions as
discussed under "Agilent N678xA SMU Wiring Requirements".
If load considerations require the use of distribution terminals that
are located away from the instrument, connect the output terminals
to the remote distribution terminals by a pair of twisted or bundled
wires. Connect each load to the distribution terminals separately. 4-
wire sensing is recommended under these circumstances. Sense
either at the remote distribution terminals or, if one load is more
sensitive than the others, directly at the critical load.
The DC Power Analyzer includes built-in relays that connect or
disconnect the ± sense terminals from their corresponding ± output
terminals. As shipped, the sense terminals are internally connected
to the output terminals. This is referred to as Local sensing.
4-wire, or remote sensing improves the voltage regulation at the load
by monitoring the voltage at the load rather than at the output
terminals. This automatically compensates for the voltage drop in the
load leads, which is especially useful for CV operation with load
impedances that vary or have significant lead resistance. Because
remote sensing is independent of other DC Power Analyzer functions,
it can be used regardless of how the instrument is programmed.
Remote sensing has no effect during CC operation.
The following figures illustrate load connections using local sensing
(A), and 4-wire remote sensing (B). When the 4-wire indicator above
the sense terminals is on, it indicates that the sense terminals must
be connected to the load.
1
+
Installation 2
37
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