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Idiomas disponibles
Idiomas disponibles
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 PTFE. Table below lists several
common cable types and describes their typical uses.
Wiring insulation and usage is described in more detail in
Cable type
Thermocouple Extension Wire
Twisted Pair,
Shielded Twisted Pair
Shielded Coaxial,
Double-Shielded Coaxial
Flat Ribbon,
Twisted pair Ribbon
Transducers and sensors
Transducers and sensors convert a physical quantity into an electrical quantity. The electrical quantity is measured
and the result is then converted to engineering units. For example, when measuring a thermocouple, the instrument
measures a DC voltage and mathematically converts it to a corresponding temperature in °C, °F, or K.
Measurement
Temperature
Pressure
Flow
Strain
Events
Digital
Keysight DAQ970A/DAQ973A User's Guide
Common uses
Thermocouple measurements.
Measurement inputs, voltage outputs,
switching, counting.
VHF signal switching.
Digital Input/Output
Typical transducer types
Thermocouple
RTD
Thermistor
Solid State
Rotary Type
Thermal Type
Resistive Elements
Limit Switches
Optical Counters
Rotary Encoder
System Status
System Cabling and
Connections.
Comments
Available in specific thermocouple types. Also available in
shielded cable for added noise immunity.
Most common cable for low-frequency measurement
inputs. Twisted pair reduces common mode noise.
Shielded-twisted pair provides additional noise immunity.
Most common cable for high-frequency signal routing.
Available in specific impedance values (50 Ω or 75 Ω).
Provides excellent noise immunity. Double-shielded cable
improves isolation between channels. Requires special
connectors.
Often used with mass termination connectors. These
cables provide little noise immunity.
Typical transducer output
0 mV to 80 mV
2-wire or 4-wire resistance from 5 Ω to 500 Ω
2-wire resistance from 10 Ω to 1MΩ
±10 DVC
4 mA to 20 mA
4-wire resistance from 10 Ω to 10 kΩ
0 V or 5 V Pulse Train
TTL-compatible Levels
3 Features and Functions
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