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– Cable resistance - Varies with wire gauge size and cable length. Use the largest gauge wire possible and try
to keep the cable lengths as short as possible to minimize the cable resistance. The following table lists typ-
ical cable resistance for copper wire of several gauge sizes (the temperature coefficient for copper wire is
0.35% per °C).
AWG
14
16
18
[1]
20
22
24
– Cable capacitance - Varies with insulation type, cable length, and cable shielding. Cable should be kept as
short as possible to minimize cable capacitance. In some cases, low-capacitance cable can be used.
The table below lists the typical cable specifications.
Cable Type
Twisted pair
Shielded twisted pair
Coaxial
Twisted pair ribbon
[1]
Recommended wire size for the screw terminals on the DAQ970A/DAQ973A plug-in modules.
Keysight DAQ970A/DAQ973A User's Guide
Ω / ft (2 conductors) at 25 °C
5 mΩ
10 mΩ
15 mΩ
20 mΩ
30 mΩ
50 mΩ
Nominal impedance
100 Ω at 1 MHz
100 Ω at 1 MHz
50 Ω or 75 Ω at 100 MHz
100 Ω at 1 MHz
Capacitance
Attenuation
10 to 20 pF/ft
Up to 1 dB/100 ft at 1 MHz
10 to 20 pF/ft
Up to 1 dB/100 ft at 1 MHz
15 to 25 pF/ft
Up to 6 dB/100 ft at 100 MHz
15 to 20 pF/ft
Up to 1 dB/100 ft at 1 MHz
4 Measurement Tutorials
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