Fluke 525B Temperature / Pressure Calibrator

The Fluke 525B is a dual-function calibrator that sources and measures temperature and pressure signals across industrial, laboratory, and automated test environments. It simulates all ANSI thermocouple types, RTDs, and thermistors while simultaneously sourcing and measuring DC voltage and current for complete transmitter and sensor validation. Pressure measurement extends from 6900 Pa to 69 MPa with optional Fluke 700 Series, 525A-P Series, and 750P Series modules.

Dual RS-232-C and IEEE 488 (GPIB) interfaces enable integration with MET/CAL® Plus Calibration Management Software for fully automated workflows.

Technical Specifications

Temperature Measurement & Simulation

• Thermocouple types: J, K, T, E, R, S, B, L, U (ANSI standard)


• RTD: ITS-90 constants with source uncertainty as low as 0.03°C


• Thermistor support including YSI 400 type


• Selectable internal or external cold junction compensation Pressure Measurement


• Internal sensor with external module compatibility


• Range: 0–1 inch of water (6900 Pa) to 10,000 PSI (69 MPa) with modules


• Unit conversion selectable from front panel or remote interface Electrical Output & Measurement


• DC voltage source: 0–100 mV, 0–10 V, 0–100 V


• DC current source: 0–20 mA, 4–20 mA loop, 0–100 mA


• Current measurement: 0.015% accuracy, 0.001 mA resolution; alternative 0.02% accuracy


• Voltage and resistance measurement capability Operating Characteristics


• Display: Two-line backlit LCD


• Settling time: <5 seconds (typical)


• Warm-up time: 2× duration since last use, maximum 30 minutes


• Power: 100/120 V or 220/240 V selectable, 47–63 Hz, 15 VA maximum


• Eight programmable setpoints for zero, span, and linearity checks

Key Features

• Compact, economical form factor


• Integrated thermocouple, RTD, thermistor, voltage, current, and pressure simulation


• Intuitive front panel with large keypads


• Modular pressure capability via Fluke 700/525A-P/750P modules


• Full automation support through MET/CAL® Plus integration

Typical Applications

• Transmitter calibration and verification


• Temperature sensor validation in process control systems


• Pressure gauge and transducer certification


• Automated test equipment (ATE) integration


• Calibration laboratory multifunction testing

Compatibility & Integration RS-232-C and IEEE 488 (GPIB) interfaces support remote operation and MET/CAL® Plus Calibration Management Software for unattended calibration sequences.