Fluke BT520 Battery Impedance Tester

The Fluke BT520 is a professional-grade battery impedance tester and analyzer, designed for precise assessment and maintenance of stationary battery systems. It measures internal battery resistance, voltage, ripple, and overall battery health, making it ideal for UPS systems, telecom installations, and industrial backup power applications. The BT520 ensures reliable performance even in challenging or hard-to-access battery cabinets and strings.

Key Capabilities & Measurement Functions

Internal Resistance Testing: Measures battery internal resistance and strap/connector resistance across four ranges down to 3 mΩ, detecting weak or deteriorating cells early.
DC and AC Voltage Measurement: Supports DC voltage from 6 V up to 1000 V and AC voltage up to 600 V, useful for analyzing battery string behavior under different load conditions.
Ripple Voltage Analysis: Detects unwanted voltage fluctuations that can compromise battery life or indicate charger/inverter issues.
Frequency & Current Support: Measures AC ripple frequencies and, with an optional current clamp, can measure DC and AC current up to 400 A.
Meter & Sequence Modes: Captures up to 999 readings in Meter mode and automates up to 100 profiles with 450 batteries per profile in Sequence mode, ideal for large battery banks.

Ease-of-Use & Intelligent Features

Intelligent Test Probes: Includes the BTL20 Intelligent Test Probe Set with long and short extenders, featuring built-in feedback for quick PASS/WARN/FAIL responses at each test point.
Threshold Settings & Feedback: Pre-program up to ten threshold sets. Measurements are instantly flagged as PASS, WARNING, or FAIL based on limits.
Data Logging & Reporting: Automated data storage on the analyzer with USB export to FlukeView Battery Management Software for detailed reporting and analysis.
Remote Save & Workflow Efficiency: Optional remote save buttons on test leads reduce test time and improve efficiency on large battery strings.

Construction & Reliability

Rugged & Ergonomic Design: Compact, durable form factor with soft carrying case for field use.
Safety Ratings: Rated to CAT III 600 V, compliant with EMC and IP40 standards.
Operating Conditions: Reliable operation from 0 °C to 40 °C, with storage from –20 °C to 50 °C and suitable humidity tolerance.
Battery Powered: Rechargeable lithium-ion battery pack provides extended operation, with convenient AC charging.

Typical Use Cases

Battery maintenance teams monitoring lead-acid or VRLA battery banks.
Facility technicians troubleshooting backup systems in data centers, telecom, and power plants.
Engineers performing preventive maintenance to extend battery life and reduce downtime.

In the Box

Fluke BT520 Battery Analyzer
BTL20 Intelligent Test Probe Set (long & short extenders)
4-wire Kelvin test pins
BTL10 Basic Test Lead Set
TL175 TwistGuard Test Leads
Rechargeable BP500 lithium-ion battery
AC charger (BC500)
USB cable and software
Shoulder strap, belt strap, magnetic hanging strap
Spare fuses, battery tags, zero-ohm calibration resistor
Soft carry case for protection and portability

Fluke BT520

Buy Fluke BT520 Impedance Tester