User`s guide

2 Installation
28 Model N6705A User’s Guide
4-Wire Sense Connections
The DC Power Analyzer includes built-in relays that connect or
disconnect the ± sense terminals from their corresponding ± output
terminals. As shipped from the factory, the sense terminals are
internally connected to the output terminals. This configuration is
referred to as Local sensing.
To use the ± sense terminals for 4-wire remote voltage sensing, click
the Settings key to display the Source Settings window. Check the
box labeled 4-Wire Sense. This disconnects the sense terminals from
the output terminals. Repeat this for all outputs for which you wish
to use 4-wire remote sensing.
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. 4-wire remote sensing improves the voltage
regulation at the load by monitoring the voltage at the load instead of
at the output terminals. This allows the DC Power Analyzer to
automatically compensate for the voltage drop in the load leads.
Connect the sense leads as close to the load as possible. Connect each
load to the output terminals using separate connecting wires. 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.
Refer to chapter 5 for more information about remote sensing as well
as additional information about load connections such as wire sizing,
noise reduction techniques, and series/parallel connections.
1. Twist leads
2. 4-wire
disabled
(indicator
is off)
3. 4-wire
enabled
(indicator
is on)
1
+ +
A B
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