Fluke 726 Precision Multifunction Calibrator
The Fluke 726 is a precision multifunction process calibrator designed for process instrumentation professionals who need high accuracy and broad measurement coverage in the field.
It can measure and source multiple process parameters, including mA, DC voltage, resistance, frequency, RTDs and thermocouples, while pressure measurement and sourcing can be added through compatible Fluke 750P pressure modules.
Precision Calibration for Process Instrumentation
The Fluke 726 combines high measurement accuracy with functions intended for practical field calibration.
Its current measurement and source accuracy is specified at 0.01%, while the instrument provides 0.001 mA resolution for 0–24 mA measurement and sourcing. This makes it suitable for precision testing of process transmitters and analog control signals.
Key Specifications
mA measurement: 0–24 mA
mA source/simulation: 0–24 mA
mA accuracy: 0.01% + 2 counts
mA resolution: 0.001 mA
DC voltage measurement: up to 30 V
DC voltage source: up to 20 V
Resistance: 0–4000 Ω
Frequency: up to 15 kHz
RTD: Measure and source
Thermocouples: Measure and source
Pressure: Compatible with Fluke 750P pressure modules
Loop power: 24 V DC
Auto-step: 25% and 100% range
Auto-ramp: Slow ramp, fast ramp and 25% step-ramp
Operating temperature: -10 °C to +55 °C
Dimensions: 200 × 96 × 47 mm
Weight: 650 g
Power: 4 AA alkaline batteries
Warranty: 3 years
Dual-Channel Process Calibration
A major advantage of the Fluke 726 is its two-channel architecture. The separate channels allow technicians to measure, source or view process signals simultaneously.
This is particularly useful when comparing an input signal with a transmitter output or when performing more complex calibration procedures without repeatedly changing connections.
4–20 mA Transmitter Calibration
The 726 provides a 24 V loop power supply and simultaneous mA measurement, allowing a transmitter to be powered and tested during calibration.
It can source or simulate current signals for checking:
Pressure transmitters
Flow transmitters
Level transmitters
Temperature transmitters
PLC/DCS analog inputs
Control system loops
The 24 V loop supply is rated for up to 22 mA and is short-circuit protected.
RTD and Thermocouple Calibration
The Fluke 726 can both measure and source RTD and thermocouple signals, allowing technicians to simulate temperature sensor inputs and verify transmitter outputs.
Supported RTD types include:
Cu10
Ni120
Pt100
Pt200
Pt500
Pt1000
Thermocouple support includes common types such as:
This allows the 726 to be used for both temperature transmitter calibration and sensor simulation.
Pressure Transmitter Calibration
Pressure capability can be added by connecting one of the Fluke 750P Series Pressure Modules.
The 750P family covers differential, gauge, vacuum, absolute, dual and high-pressure applications, with pressure accuracy available from 0.025% of range, depending on the module selected.
The 726 can therefore be used for:
Pressure transmitter calibration
Pressure switch testing
Gauge verification
I/P converter testing
Control valve testing
Valve and I/P Testing
The 726 can source mA while simultaneously measuring pressure, making it useful for testing current-to-pressure converters and control valves.
This allows technicians to observe the relationship between an electrical control signal and the resulting pressure response without requiring multiple separate instruments.
Pressure Switch Testing
The integrated pressure switch test function can capture:
Set point
Reset point
Deadband
When combined with an appropriate pressure module, the 726 can therefore be used to verify pressure switches during commissioning and maintenance.
Enhanced Flowmeter Testing
The Fluke 726 also includes enhanced functions for flowmeter testing, including a frequency totalizer and frequency pulse-train source mode.
This makes it suitable for testing flow instruments that use frequency or pulse outputs in addition to conventional 4–20 mA signals.
Automatic Step and Ramp Testing
For transmitter linearity testing, the 726 provides automatic output functions including:
Slow ramp
Fast ramp
25% step-ramp
25% steps
100% steps
These functions allow technicians to test transmitter response across multiple calibration points more efficiently.
Calibration Result Storage
The Fluke 726 can store up to eight calibration results in memory for later analysis.
It can also calculate transmitter error percentage directly, reducing the need for manual calculations during field calibration.
Fluke 726 vs. Fluke 725
The Fluke 725 and Fluke 726 share a broad multifunction process calibration platform, but the 726 is positioned as the precision model.
The 726 provides 0.01% mA accuracy, dual-channel operation, calibration result storage, pressure switch testing and enhanced flowmeter testing. It is therefore better suited to applications where measurement accuracy and broader process calibration capability are more important.
简单理解：
Fluke 725 → Multifunction Process Calibrator
Fluke 726 → Precision Multifunction Process Calibrator
如果客户需要更高精度以及更复杂的过程校准功能，726 是更合适的选择。
Fluke 726 vs. Fluke 754
The Fluke 726 is a precision multifunction calibrator, while the Fluke 754 adds documenting capabilities and integrated HART communication.
If the application mainly requires high-accuracy multifunction process calibration, the 726 is well suited. If the workflow also requires digital HART configuration and documented calibration procedures, the 754 is the more appropriate platform. Fluke itself recommends the 754 when documenting and HART communication are required.
Typical Applications
Pressure Instrumentation
Pressure transmitter calibration
Pressure switch testing
I/P converter testing
Control valve testing
Temperature Instrumentation
RTD transmitter calibration
Thermocouple transmitter calibration
Temperature sensor simulation
Temperature loop testing
Flow Instrumentation
Flow transmitter testing
Frequency output verification
Pulse train testing
Flowmeter calibration
Process Control
4–20 mA loop testing
PLC/DCS analog I/O verification
Transmitter commissioning
Signal simulation
Linearity testing
Maintenance
Field calibration
Preventive maintenance
Troubleshooting
Zero/span verification
Multi-point calibration
FAQ
Q: What is the Fluke 726 used for?
A: The Fluke 726 is used for precision calibration of process transmitters, sensors, valves and other process instruments across mA, voltage, temperature, frequency, resistance and pressure applications.
Q: Can the Fluke 726 calibrate 4–20 mA transmitters?
A: Yes. It can measure, source and simulate up to 24 mA and provides a built-in 24 V loop supply for transmitter testing.
Q: Can the Fluke 726 calibrate RTDs and thermocouples?
A: Yes. It can both measure and source multiple RTD and thermocouple types.
Q: Can the Fluke 726 measure pressure?
A: Yes. Pressure measurement and sourcing are available when the 726 is used with compatible Fluke 750P pressure modules.
Q: Does the Fluke 726 support HART communication?
A: No. The 726 is a precision multifunction calibrator. For integrated HART communication and documenting functions, Fluke positions the 754 Documenting Process Calibrator with HART as the appropriate model.
