3 System Overview
84 Keysight 34970A/34972A 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. 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 Typical transducer types Typical transducer output
Temperature
Thermocouple 0 mV to 80 mV
RTD
2-wire or 4-wire resistance from 5Ω to
500Ω
Thermistor
2-wire resistance from
10Ω to 1 MΩ
Pressure Solid State +/-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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