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2 Installation
Multiple Load Wiring
If you are using local sensing and are connecting multiple loads to one output, connect each load to
the output terminals using separate load wires as shown in the following figure. This minimizes mutual
coupling effects and takes full advantage of the power module's low output impedance. Keep each
wire-pair as short as possible and twist or bundle the wires to reduce lead inductance and noise
pickup. The goal is to always minimize the loop area or physical space between the + and - load wires
from the power system to the load.
Note that Keysight Models N678xA SMU have additional wiring restrictions as previously discussed
under
Keysight N678xA SMU
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. Remote voltage 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.
Positive and Negative Voltages
Either positive or negative voltages with respect to ground can be obtained from the output by
grounding (or "commoning") one of the output terminals. Always use two wires to connect the load to
the output regardless of where or how the system is grounded. The instrument can be operated with
any output terminal ± 240 VDC including output voltage from ground.
Keysight Models N678xA SMU are optimized for grounding the negative output
terminal. Grounding the positive terminal may result in increased current
measurement noise and a reduction in current measurement accuracy.
60
Wiring.
Keysight N6700C Series User's Guide
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