Installation 2
Keysight N6700 User’s Guide 33
Keysight N678xA SMU Wiring Requirements
Because of the effect of wire inductance, the wire length information
given in the previous table does not apply to Keysight Models N678xA
SMU.
To minimize the effect of wire inductance, the following table describes
the allowable load lead and wire length for several common output wire
types. Using longer (or shorter) wire lengths than those indicated in the
table may cause output oscillation.
Twisted pair (AWG 14 or
smaller)
1 to 4.25 ft 0.3 to 1.3 m
50 ohm coaxial (RG-58) 2 to 10 ft 0.6 to 3 m
10 ohm coaxial (inductance per
cable foot ≤ 32 nH)
8.5 to 33 ft 2 to 10 m
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 chapter 4 under “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 (C
L
) 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.
C
L
4
5
1
2
3
L
< 15 cm
+ s
- s
+
-
N678xA
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