Which Multimeter Should You Buy?

Verification & Live-Dead-Live Testing

Before opening any industrial panel, verifying that test equipment operates correctly is a mandatory safety step. Using a proving unit, such as the Fluke PRV240FS, allows you to verify that a meter is accurately reading both AC and DC voltages before and after taking measurements on a circuit.

Using single-setting voltage testers like the Fluke T6-1000 eliminates mode selection errors. On traditional multimeters like the Fluke 1587 FC, failing to switch from DC to AC mode when troubleshooting upstream control power can result in false zero readings, creating a dangerous misinterpretation that a circuit is dead when high-voltage AC is still present.

Specialty Process Meters

Different troubleshooting environments require specific hardware capabilities:

• Non-Intrusive Loop Testing: The Fluke 773 milliamp clamp meter enables process technicians to measure 4-20mA signals without opening the current loop, preventing unwanted process shut downs.

• Remote Measurements: The Fluke 381 features a detachable wireless display, allowing technicians to take readings inside a panel while standing at a safe distance or monitoring remote equipment.

• Harsh & Wet Environments: Environmental ratings matter when working in water treatment or washdown facilities; IP67-rated meters like the Fluke 28 II can survive submersion as long as the port plugs remain sealed.

Safety Category Ratings

Category ratings (CAT ratings) define a meter's ability to withstand transient voltage spikes. When working on 480V variable frequency drives (VFDs), rectifying AC to DC results in DC bus voltages reaching approximately 680-690V DC. Consequently, a 600V CAT III meter is insufficient; industrial technicians should always utilize a 1000V CAT III / 600V CAT IV rated meter equipped with safety-certified leads.

Meters Tim Recommends

• Fluke T6-1000 - Great economical meter for making AC and DC voltage check, measuring resistance (Ohms), and AC amps.

• Fluke 1587 FC - Ideal for motor and control troubleshooting, combining standard AC/DC voltage and resistance checks with advanced insulation testing.

• Fluke 773 - An essential clamp meter for industrial technicians needing to test and calibrate process control loops without stopping the process.

• Fluke 381 - The go-to meter for distant or hard-to-reach setups, allowing you to connect your leads in one spot and carry the display directly to your work area.

• Fluke 28 II - Built for harsh and wet environments, featuring an IP67 waterproof and dustproof rating that survives full submersion and rough job site conditions.

• Fluke PRV240FS - An essential safety tool for Live-Dead-Live testing that safely simulates AC/DC voltage and FieldSense signals to verify your meter is working before opening a panel.