Fluke 116 True-RMS HVAC Multimeter - Fluke-116

The Fluke 116 True-RMS Digital Multimeter is engineered from the ground up for HVAC professionals, the only multimeter in the Fluke 100-series that combines built-in temperature measurement, microamp capability for flame sensor testing, and a low-impedance mode for ghost voltage prevention in a single compact instrument. HVAC technicians routinely need to verify flame rod current (in the microamp range), measure motor capacitor condition, check refrigerant temperature, and confirm that control circuits are truly de-energized before touching them. The 116 handles all four without instrument switching, making it the most productive single meter for residential and commercial HVAC service calls.

Key Features

• Microamp DC Measurement for Flame Sensor Testing: Flame rods (flame sensors) in gas-fired HVAC equipment produce a rectification current typically in the 1–10 microamp range. A flame sensor with weak or failing current causes nuisance lockouts that are misdiagnosed as igniter, gas valve, or control board failures. The 116's microamp range directly measures flame rod current, distinguishing a dirty sensor (low µA) from a failed one (zero µA), the diagnostic that solves the most common nuisance lockout complaints in residential heating.
• Built-In Temperature to 400°C: The included 80BK integrated thermocouple probe measures from -40°C to 400°C (-40°F to 752°F). HVAC technicians use this for superheat and subcooling calculations, discharge line temperature, heat exchanger temperature differential, and flue gas temperature, all without a separate temperature instrument on the service call.
• Motor Capacitor Testing (Start and Run): Capacitance measurement from 1nF to 9,999µF covers both start and run capacitors used in HVAC compressors and fan motors. A weak capacitor (reading 10–15% below nameplate) causes reduced motor starting torque, high running current, premature motor failure, and locked-rotor conditions, diagnosable in seconds with the 116's cap function before pulling the motor.
• Low-Impedance Mode (LoZ), Ghost Voltage Elimination: Commercial HVAC control systems often route 24V, 120V, and 230V circuits in the same conduit or close proximity. Capacitive coupling induces "ghost" voltages on de-energized conductors that read as live on a standard high-impedance meter. The 116's LoZ mode drains these phantom voltages, confirming true de-energization before component contact.
• True-RMS for VFD-Driven Equipment: Variable-speed compressors, ECM fans, and variable-frequency drives in modern HVAC equipment produce non-sinusoidal waveforms. True-RMS gives accurate voltage and current readings on these loads; averaging meters can read 20–30% high or low depending on the drive's output waveform.
• AC/DC Voltage to 600V: Covers single-phase 120V and 240V residential systems plus 208V and 230V commercial HVAC equipment, three-phase 460V rooftop units, and 24V control circuits, all within the 116's CAT III 600V safety rating.
• Compact One-Handed Design: The 116's ergonomic grip and balanced weight enable one-handed operation inside air handler cabinets, control panel enclosures, and other confined HVAC equipment compartments where both hands are needed for probing and component access.
• Frequency Measurement: Verifies VFD output frequency, confirms proper fan and blower speeds, and checks line frequency on generator-powered sites.

Technical Specifications Overview

The 116 measures AC/DC voltage to 600V (True-RMS), AC current to 10A, DC current to 600mA with a microamp range for flame sensors, resistance to 40MΩ, capacitance to 9,999µF for motor cap testing, frequency, and temperature from -40°C to 400°C. Its 600V upper limit is appropriate for the HVAC market, most commercial equipment tops out at 460V three-phase. Compared to the 115 (general field service) and 114 (general electrical), the 116 adds temperature, microamps, and LoZ mode specifically for HVAC diagnostic workflows.

HVAC Service & Maintenance Applications

• Flame sensor (flame rod) diagnosis, direct microamp current measurement confirms sensor output and distinguishes weak from failed sensors without replacing parts by guess
• Motor capacitor testing, capacitance measurement verifies start and run capacitor condition before motor replacement on compressors and fan motors
• Refrigerant system temperature measurement, superheat, subcooling, and line temperature measurement for charge verification and system commissioning
• VFD and ECM motor verification, True-RMS voltage and current on variable-speed drives, plus frequency to confirm programmed output speed
• Commercial rooftop unit electrical diagnostics, 208V/230V/460V compressor and fan motor power measurement, control circuit verification, and contactor testing

Fluke 116 Calibration

PJi operates an ISO/IEC 17025 Accredited Calibration Lab and provides NIST-traceable calibration for the Fluke 116 at the time of purchase, add calibration to your order at checkout. Our calibration documentation satisfies FAA Part 145 tool control requirements, ISO 9001 quality system records, and AS9100 calibration traceability requirements. For repair stations and quality-certified facilities that require documented traceability, PJi is the one-stop source: the instrument and the calibration certificate in a single transaction. Calibration-only companies cannot sell you the instrument. Major retailers cannot calibrate it. PJi does both.

Why Buy from Pilot John International

Pilot John International is an authorized Fluke distributor with specialized expertise serving aviation maintenance, FAA Part 145 repair stations, and industrial MRO facilities. Unlike Amazon, Grainger, or Test Equipment Depot, which sell Fluke instruments but offer zero calibration services, PJi's in-house ISO/IEC 17025 Accredited Calibration Lab calibrates your instrument at purchase. We stock the full Fluke catalog, ship same-business-day on in-stock items, and our technical staff understands the demands of aviation and industrial electrical maintenance.