User`s guide

Operation and Connections Tutorial 5
Model N6705A User’s Guide 101
Multiple Loads
If you are using local sensing and are connecting multiple loads to
one output, connect each load to the output terminals using separate
connecting wires as shown in the following figure.
1. Twist leads
2. 4-wire
disabled
(indicator
is off)
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.
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.
4-Wire Sense Considerations
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 compensate 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. Remote
sensing has no effect during CC operation.
4-wire sensing is implemented using relay switches that are located
behind the front panel output terminals. Because it is independent of
other DC Power Analyzer functions, 4-wire sensing can be used
regardless of how the instrument is programmed.
To enable 4-wire sensing, press the Settings key and check the box
labeled Enable 4-Wire Sensing. Then make your output connections
as shown in the following figure. Connect the sense leads as close to
the load as possible. Refer to the “Wire Size” section for information
about selecting the proper wire size. Best results are obtained by
using the shortest load leads practical. Keep the load leads under
14.7 meters (50 feet) per lead because of inductance effects.
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