System Overview 3
Keysight 34970A/34972A User’s Guide 83
System cabling
The plug-in modules have screw-terminal connectors to make it easy to connect
your system cabling. The type of cabling that you use to connect your signals,
transducers, and sensors to the module is critical to measurement success. Some
types of transducers, such as thermocouples, have very specific requirements for
the type of cable that can be used to make connections. Be sure to consider the
usage environment when choosing wire gauge and insulation qualities. Wire
insulation typically consists of materials such as PVC or Teflon®. The table below
lists several common cable types and describes their typical uses.
Teflon is a registered trademark of E.I. duPont deNemours and Company.
Wiring insulation and usage is described in more detail in System Cabling and
Connections starting on page 268.
Cable type Common uses Comments
Thermocouple
Extension Wire
Thermocouple measurements.
Available in specific thermocouple types.
Also available in a shielded cable for added
noise immunity.
Twisted Pair,
Shielded Twisted Pair
Measurement inputs, voltage
outputs, switching, counting.
Most common cable for low-frequency
measurement inputs. Twisted pair reduces
common mode noise. Shielded-twisted
pair provides additional noise immunity.
Shielded Coaxial,
Double-Shielded
Coaxial
VHF signal switching.
Most common cable for high-frequency
signal routing. Available in specific
impedance values (50Ω or 75Ω). Provides
excellent noise immunity. Double-shielded
cable improves isolation between channels.
Requires special connectors.
Flat Ribbon,
Twisted pair Ribbon
Digital Input/Output
Often used with mass termination
connectors. These cables provide little
noise immunity.
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