Fluke 707 Current Loop Calibrator

The Fluke 707 is a professional current loop calibrator developed for calibration, repair and maintenance of industrial process instrumentation. It combines mA measurement, sourcing and simulation with a large display and Quick Click rotary control, allowing technicians to perform loop checks and signal adjustments quickly with one hand.

High-Accuracy 4–20 mA Loop Calibration

The 707 provides 0.015% mA accuracy and 1 µA resolution for current measurement, sourcing and simulation. It supports both 0–20 mA and 4–20 mA operating modes, making it suitable for a wide range of process control applications.

Key specifications:

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  mA measurement: 0–24 mA
  
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  mA sourcing: 0–20 mA / 4–20 mA
  
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  mA simulation: 0–20 mA / 4–20 mA
  
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  mA resolution: 0.001 mA / 1 µA
  
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  mA accuracy: 0.015% of reading + 2 LSD
  
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  Voltage measurement: 0–28 V DC
  
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  Voltage resolution: 1 mV
  
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  Internal loop power: 24 V
  
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  HART-compatible resistance: Integrated
  
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  Auto Step / Auto Ramp: Yes
  
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  Span Check: 0–100%
  
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  Operating temperature: -10 to +55 °C
  
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  Battery: One 9 V alkaline battery
  
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  Warranty: 3 years
  

Quick Click One-Handed Operation

One of the main advantages of the Fluke 707 is its Quick Click rotary control. It combines the adjustment convenience of a knob with push-button operation, allowing technicians to select functions and adjust output quickly without needing both hands.

The large display simultaneously shows mA and percentage of span, making signal interpretation easier during transmitter calibration and loop troubleshooting.

Built-In 24 V Loop Power

The Fluke 707 includes an internal 24 V loop supply, allowing technicians to power and measure a transmitter at the same time without requiring a separate DMM or external loop power supply.

This makes the 707 particularly useful for:

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  4–20 mA transmitter testing
  
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  Process loop commissioning
  
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  Analog input/output verification
  
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  Instrument maintenance
  
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  Control loop troubleshooting
  
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  Transmitter calibration
  

HART-Compatible Loop Testing

The 707 includes HART-compatible resistance connected in series with the loop supply, allowing compatibility with HART communicators when performing loop testing. This is an important advantage over basic mA calibrators when working with smart process transmitters.

Note: The Fluke 707 itself is a loop calibrator with HART-compatible loop resistance; it is not a standalone HART communicator.

Step, Ramp and Span Check Functions

For commissioning and functional testing, the 707 provides several automated output functions:

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  25% push-button steps for linearity checks
  
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  0–100% span check for fast zero and span verification
  
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  Slow ramp
  
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  Fast ramp
  
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  Step ramp
  

Ramp functions can be used for checking control valves and observing how process loops respond to changing current signals.

Fluke 707 vs. Fluke 705

The Fluke 705 is positioned as a cost-effective loop calibrator for essential mA testing, while the Fluke 707 is the higher-performance option.

The 707 provides 0.015% accuracy compared with the 705's 0.02% accuracy, while also adding the Quick Click interface, HART-compatible resistance and enhanced loop testing functions. Therefore, the 707 is better suited when calibration accuracy and operating efficiency are more important than simply minimizing instrument cost.

Typical Applications

The Fluke 707 can be used for:

Process Instrumentation

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  Pressure transmitter calibration
  
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  Flow transmitter testing
  
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  Level transmitter loop testing
  
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  Temperature transmitter output verification
  

Control Systems

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  PLC analog input/output testing
  
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  DCS loop verification
  
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  Control valve signal testing
  
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  4–20 mA signal troubleshooting
  

Maintenance & Commissioning

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  Loop commissioning
  
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  Zero/span verification
  
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  Linearity testing
  
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  Signal simulation
  
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  Transmitter troubleshooting
  

FAQ

Q: What is the Fluke 707 used for?

A: The Fluke 707 is used to measure, source and simulate mA signals for calibration, commissioning, maintenance and troubleshooting of industrial current loops.

Q: Can the Fluke 707 test 4–20 mA signals?

A: Yes. It can measure 0–24 mA and source or simulate both 0–20 mA and 4–20 mA signals.

Q: Does the Fluke 707 provide loop power?

A: Yes. It provides an internal 24 V loop supply while measuring mA.

Q: What is the accuracy of the Fluke 707?

A: The specified mA accuracy is 0.015% of reading + 2 LSD, with 0.001 mA resolution.

Q: Does the Fluke 707 support HART?

A: It includes HART-compatible resistance for use with HART communicators, but it is not itself a full HART communicator.