Instrumentation Signals

Field signal fundamentals for technicians — covering analog loops, communication protocols, scaling logic, and troubleshooting.

4–20 mA Current Loops

4–20 mA Fundamentals

Calibration & Troubleshooting

HART Communication

HART Fundamentals

  • HART Protocol Basics
  • Digital + Analog Overlay Concept
  • Multidrop Communication

HART Troubleshooting

  • Communication Failure
  • Noise & Loop Resistance Issues
  • Handheld Communicator Errors

HART pages will follow the same structured technical format.

Future Signal Topics

Analog Signals

  • 0–10 V Signals
  • Frequency Signals
  • Pulse Output

Digital Communication

  • Foundation Fieldbus
  • Profibus
  • Modbus