1 Introduction to the 34980A
20 Keysight 34980A Mainframe User’s Guide
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 by the 34980A's main system processor. 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.
Cable Type Co m m o n U s e s 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.
Measurement Typical Transd ucer Type T y p i c a l T r a n s d u ce r O u t p u t
Temperature
Thermocouple 0 mV to 80 mV
Resistance temperature detector (RTD) 2-wire or 4-wire resistance from 5Ω to 500Ω
Thermistor 2-wire or 4-wire resistance from 10Ω to 1MΩ
Pressure Solid state device ±10 VDC
Flow Rotary type, thermal type 4 mA to 20 mA
Strain Resistive elements 4-wire resistance from 10Ω to 10 kΩ
Events Limit switches, optical counters, rotary
encoder
0V or 5V pulse train
Digital System status TTL levels
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