Fluke 705 Loop Calibrator

The Fluke 705 is designed as a practical and cost-effective loop calibrator for engineers and technicians working with industrial 4–20 mA process instrumentation. It combines current measurement, sourcing and simulation in one portable instrument, reducing the need for separate test equipment during routine loop calibration and troubleshooting.

Complete mA Loop Testing

The Fluke 705 can measure, source and simulate mA signals, making it suitable for checking transmitters, control loops, analog I/O and other process instrumentation.

Its internal 24 V loop supply can power a transmitter while simultaneously measuring the current signal, allowing basic loop testing without requiring a separate power supply or DMM.

Fast Signal Testing and Linearity Checks

For routine commissioning and maintenance, the 705 provides several functions designed to speed up signal verification:

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  0–24 mA current measurement
  
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  0–20 mA and 4–20 mA sourcing
  
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  0–20 mA and 4–20 mA simulation
  
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  0.001 mA resolution
  
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  0.02% mA measurement accuracy
  
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  24 V internal loop supply
  
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  0–28 V DC voltage measurement
  
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  25% push-button step function
  
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  Selectable slow ramp, fast ramp and step outputs
  
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  Span Check for quick zero/span verification
  
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  Simultaneous mA and % of span display
  

Designed for Process Instrumentation Maintenance

The Fluke 705 is particularly useful where technicians need a straightforward instrument for routine calibration and troubleshooting of mA loops rather than advanced digital communication functions.

Typical applications include:

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  4–20 mA transmitter testing
  
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  Process loop calibration
  
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  PLC and control system analog signal verification
  
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  Control valve signal testing
  
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  Instrument commissioning
  
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  Loop troubleshooting and maintenance
  
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  Zero and span checks
  
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  Linearity and ramp testing
  

Compact Field Instrument

The Fluke 705 measures approximately 152 × 70 × 41 mm and weighs about 340 g, making it suitable for portable field work. It operates from a single 9 V battery and is specified for an operating temperature range of -10 °C to +55 °C. The standard package includes a protective holster, test leads, alligator clips and a NIST-traceable calibration report and data.

Fluke 705 vs. Fluke 707

The Fluke 705 is the more cost-effective option when standard mA loop measurement, sourcing and simulation are the primary requirements. The Fluke 707 adds higher accuracy, a Quick-Click rotary control and a built-in 250 Ω loop resistance function for HART instrumentation.

FAQ

Q: What is the Fluke 705 used for?

A: It is used to measure, source and simulate mA signals for calibration, maintenance and troubleshooting of industrial process loops.

Q: Can the Fluke 705 test 4–20 mA signals?

A: Yes. It supports 4–20 mA sourcing and simulation and can measure currents from 0 to 24 mA.

Q: Does the Fluke 705 provide loop power?

A: Yes. It provides an internal 24 V loop supply while measuring mA, allowing a transmitter to be powered and tested at the same time.

Q: What is the accuracy of the Fluke 705?

A: Current measurement accuracy is specified at 0.02% of reading + 2 LSD, with 0.001 mA resolution.

Q: Does the Fluke 705 have HART communication?

A: No. The 705 is a conventional mA loop calibrator. For integrated HART communication and diagnostics, a model such as the Fluke 709H is more appropriate.