Keysight N678xA SMU Wiring
Because of the effect of wire inductance, the wire length information given in the
previous table does not apply to Models N678xA SMU.
To minimize the effect of wire inductance, the following table describes the allowable load lead length
for several common output wire types. Using longer (or shorter) wire lengths than those indicated in
the table may cause output oscillation.
Cable Type
To module connector
Length in feet Length in meters
Twisted pair (AWG 14 or smaller) 1 to 4.25 feet 0.3 to 1.3 meters
50 ohm coaxial (RG-58) 2 to 10 feet 0.6 to 3 meters
10 ohm coaxial
(inductance per cable foot ≤ 32 nH)
8.5 to 33 feet 2 to 10 meters
High Bandwidth Modes with Remote Sensing
The following wiring requirements apply when using Keysight Models N678xA SMU in the High
bandwidth modes with remote sensing.
Refer to Output Bandwidth for more information about the bandwidth settings.
1. Load wires must be twisted-pair or coax and must not be twisted along with the sense wires. Refer
to the above table for length (L).
2. Sense wires must be twisted-pair or coax and must not be twisted with the load wires.
3. No capacitors are allowed within the sense-compensated load path.
4. If the load capacitor (CL) is not located at the sense point, the distance from the sense point to the
load capacitor cannot exceed 15 cm and must be twisted-pair, coax, or pc traces.
2 Installation
58 Keysight N6705C Operating and Service Guide
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