Fluke’s 377 and 378 FC Clamp Meters are advanced tools designed for electricians and technicians who need fast, safe, and accurate measurements.
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Both models use FieldSense™ technology, allowing you to measure voltage and current simultaneously without making direct contact with live conductors. While the two meters look almost identical, there are a few important differences that set them apart.
Table of Contents
📋 Overview of the Fluke 377 FC
The Fluke 377 FC is a powerful clamp meter built for everyday professional use. It focuses on providing safe, non-contact measurements with the reliability Fluke is known for.
Key Features:
- FieldSense™ technology: measure AC/DC voltage and current at the same time without test leads.
- True-RMS AC voltage and current for accuracy on non-linear loads.
- Measures up to 1000 V AC/DC and 1000 A AC/DC.
- Compatible with iFlex® flexible current probe for expanded measurement range (up to 2500 A AC).
- Wireless connectivity with the Fluke Connect® app.
Best For: Electricians and technicians who want a safe, high-performance clamp meter for daily electrical work.
⚡ Overview of the Fluke 378 FC
The Fluke 378 FC builds on everything the 377 offers but adds power quality (PQ) indication features, making it more advanced for diagnosing electrical system issues.
Key Features:
- All features of the Fluke 377.
- Power Quality Indicator: quickly identifies PQ issues like dips and swells in voltage.
- Guides users to potential problems that might affect equipment performance.
- Helps reduce downtime by detecting PQ-related issues before they escalate.
Best For: Professionals who need not just measurement but also diagnostic insight into power quality issues in electrical systems.
⚖️ Fluke 377 vs 378: Side-by-Side
| Feature | Fluke 377 FC | Fluke 378 FC |
|---|---|---|
| Voltage Measurement | Up to 1000 V AC/DC | Up to 1000 V AC/DC |
| Current Measurement | Up to 1000 A AC/DC (2500 A with iFlex®) | Up to 1000 A AC/DC (2500 A with iFlex®) |
| FieldSense™ Technology | ✅ Yes | ✅ Yes |
| True-RMS | ✅ Yes | ✅ Yes |
| Power Quality Indicator | ❌ No | ✅ Yes |
| Connectivity | Fluke Connect® | Fluke Connect® |
| Use Case | General electrical measurement | Electrical measurement + power quality diagnostics |
| 💳 Pricing | 💲Check Price | 💲Check Price |
✅ Pros and Cons
Fluke 377 FC
✔ Safe FieldSense™ measurement
✔ True-RMS accuracy
✔ iFlex® probe expands range
✔ Great for general electricians
✘ No power quality diagnostics
Fluke 378 FC
✔ Includes all 377 features
✔ Adds power quality indication
✔ Helps diagnose deeper electrical problems
✘ More expensive than 377
📝 Which One Should You Choose?
- Pick the Fluke 377 FC if you want a reliable, advanced clamp meter for everyday electrical testing with FieldSense™ safety.
- Pick the Fluke 378 FC if you need extra diagnostic capability to troubleshoot power quality problems, making it ideal for industrial environments where PQ issues can cause downtime.
In short, the 377 is the high-performance clamp meter, while the 378 adds smart power quality diagnostics for advanced users.
