Fluke 714B Thermocouple Calibrator

The Fluke 714B is a dedicated thermocouple calibrator designed for technicians who need to verify, simulate and calibrate thermocouple-based temperature instrumentation.

Unlike the broader Fluke 724 Temperature Calibrator, which also supports RTDs, resistance and voltage functions, the 714B focuses specifically on thermocouple and millivolt calibration. This focused design makes it a practical choice for applications where thermocouple calibration is the primary requirement.

Measure and Simulate 17 Thermocouple Types

The 714B can measure and source/simulate 17 thermocouple types, covering a wide range of industrial temperature measurement applications.

Supported thermocouple types include:

• 
  Type B
  
• 
  Type C
  
• 
  Type E
  
• 
  Type J
  
• 
  Type K
  
• 
  Type L
  
• 
  Type M
  
• 
  Type N
  
• 
  Type R
  
• 
  Type S
  
• 
  Type T
  
• 
  Type U
  
• 
  Additional thermocouple types supported by the instrument's calibration tables
  

It can also work directly with millivolt signals, making it useful for testing linear thermocouple transmitters.

Millivolt Source for Thermocouple Transmitters

Many temperature transmitters accept thermocouple signals and convert them into a standardized output such as 4–20 mA.

The 714B provides a -10 to 75 mV measurement and source range, allowing technicians to test the input circuit of thermocouple transmitters without physically heating or cooling a sensor.

This is particularly useful for:

• 
  Thermocouple transmitter calibration
  
• 
  Linear thermocouple transmitter testing
  
• 
  mV signal verification
  
• 
  Process temperature loop troubleshooting
  

The specified mV resolution is 0.01 mV.

Simultaneous Temperature and mA Measurement

The 714B can measure 4–20 mA while sourcing a temperature signal.

For example, during temperature transmitter calibration, the 714B can simulate a thermocouple input while measuring the transmitter's current output. This allows technicians to verify the relationship between the simulated temperature and the resulting 4–20 mA signal.

The current measurement specification is:

• 
  Range: 0–24 mA
  
• 
  Resolution: 0.001 mA
  
• 
  Accuracy: 0.010% + 2 μA
  

This makes the 714B useful not only as a thermocouple simulator but also for checking the electrical output of temperature transmitters.

Linearity Checks with Ramp and Step Functions

The Fluke 714B includes configurable source functions for checking transmitter linearity.

Available functions include:

• 
  Linear ramp
  
• 
  25% step auto-ramp
  
• 
  Configurable source settings
  
• 
  Temperature source/simulation
  
• 
  mV source
  

These functions allow technicians to move through several temperature points automatically and observe the corresponding transmitter output.

For example:

0% → 25% → 50% → 75% → 100%

can be used to check whether the transmitter responds correctly across its calibrated range.

Compact Field Design

The 714B is designed as a portable, battery-powered field calibrator.

Important physical features include:

• 
  Backlit display
  
• 
  Magnetic hanging tool
  
• 
  Protective boot
  
• 
  Compact handheld housing
  
• 
  IP52 protection
  
• 
  1 m drop specification
  
• 
  EMI-tolerant portable design
  

The included magnetic hanger allows technicians to attach the calibrator to suitable metal surfaces and keep both hands available during calibration work.

Calibration Accuracy and Traceability

The 714B provides both one-year and two-year accuracy specifications, depending on the thermocouple type and measurement range.

The instrument is supplied with a traceable calibration certificate with data, supporting applications where calibration traceability is required.

Key Specifications

• 
  Product type: Thermocouple calibrator
  
• 
  Thermocouple support: 17 types
  
• 
  Thermocouple function: Measure and source/simulate
  
• 
  mV range: -10 to 75 mV
  
• 
  mV resolution: 0.01 mV
  
• 
  mA measurement: 0–24 mA
  
• 
  mA resolution: 0.001 mA
  
• 
  mA accuracy: 0.010% + 2 μA
  
• 
  Linear ramp: Yes
  
• 
  25% step auto-ramp: Yes
  
• 
  Display: Backlit
  
• 
  IP rating: IP52
  
• 
  Drop specification: 1 m
  
• 
  Operating temperature: -10 to +50 °C
  
• 
  Battery: 4 × AA
  
• 
  Dimensions: 52.5 × 84 × 188.5 mm
  
• 
  Weight: 515 g
  
• 
  Calibration certificate: Traceable certificate with data
  
• 
  Warranty: 3 years
  

Typical Applications

Thermocouple Calibration

Measure or simulate thermocouple signals to verify temperature sensors and associated instrumentation.

Temperature Transmitter Testing

Simulate a thermocouple input and measure the transmitter's 4–20 mA output.

Linear Thermocouple Transmitter Calibration

Use the mV source function to test transmitters that accept linearized thermocouple signals.

Process Temperature Loop Troubleshooting

Measure transmitter current while sourcing a controlled thermocouple signal.

Thermocouple Linearity Testing

Use ramp and step functions to verify transmitter response across multiple calibration points.

Field Instrument Maintenance

Use the compact battery-powered design for routine calibration and troubleshooting outside the laboratory.

FAQ

What is the Fluke 714B used for?

The Fluke 714B is used for measuring, sourcing and simulating thermocouple signals during temperature sensor and transmitter calibration.

How many thermocouple types does the Fluke 714B support?

The Fluke 714B supports 17 thermocouple types according to Fluke's current product specifications.

Can the Fluke 714B simulate a thermocouple?

Yes. It can both measure and source/simulate supported thermocouple signals.

Can the Fluke 714B test 4–20 mA temperature transmitters?

Yes. It can measure 0–24 mA while sourcing a temperature signal, allowing technicians to check the output of temperature transmitters.

Can the Fluke 714B source millivolts?

Yes. It provides a -10 to 75 mV measurement and source range for testing thermocouple transmitters and related instrumentation.

Does the Fluke 714B include a calibration certificate?

Yes. Fluke lists a traceable calibration certificate with data among the included items.