Fluke 378 FC Non-Contact True-RMS Clamp Meter with PQ Power Quality Screening

Troubleshooting of industrial control, motors and inverter power distribution, plus harmonic screening and three-phase testing. It shares identical hardware with the 377 FC, while the 378 FC exclusively features PQ power quality indication.

Core Technology: FieldSense™ Electric Field Sensing Technology. No physical contact between the clamp jaw and live conductors. Simply connect a ground lead to measure voltage and current simultaneously, greatly reducing electric shock risks.

Wichtige Spezifikationen

Sicherheitsbewertung: CAT III 1000 V / CAT IV 600 V

Clamp Jaw AC Current: 0～999.9 A, Auflösung 0.1 A; Genauigkeit 2% ±5 digits (45–66 Hz)

iFlex Flexible Probe (Standard i2500-18, 1.8 M): AC 0～2500 A, ideal for busbars, compact switchgear and large cables

Gleichspannung: 0～1000 V; Wechselspannung: 0～1000 V (direct probe measurement); FieldSense non-contact voltage up to 1000 V

Frequenzbereich: 5 Hz～500 Hz, kompatibel mit Wechselrichtern, variable-speed motors and UPS systems

Widerstand: 60 kΩ; Kapazität: 1000 μF; Continuity beep; Inrush startup current capture, MIN/MAX/Average value recording

True-RMS (TRMS) Messung, designed for non-linear loads such as inverters, servo drives and switching power supplies

Kieferöffnung: 34 mm; Nettogewicht: 463 G; Stromversorgung: 2×AA batteries, Akkulaufzeit 200 Std.

Wireless Connectivity: Fluke Connect Bluetooth. Save data, perform automatic three-phase calculations, phase sequence verification and cloud storage via mobile APP

Exclusive Functions (Difference from 377 FC)

✅ PQ Power Quality Indicator: Automatically detects voltage, current and power factor anomalies under FieldSense mode. Quickly identify whether the fault originates from upstream grid supply or downstream motor/inverter loads (early warning for harmonics, three-phase imbalance and poor power factor)

✅ Automatic Three-Phase Test: Complete three-phase measurement in 3 Schritte. The APP automatically calculates line-to-ground, line-to-line voltages, phase sequence and unbalance without manual recording and calculation

✅ Inrush Startup Current: Capture the closing surge current of motors and compressors to diagnose mechanical jamming and faulty starting circuits

Standardzubehör

Fluke 378 FC Clamp Meter Main Unit

i2500-18 iFlex Flexible Current Probe (1.8 M)

TL224 Test Leads, TP175 TwistGuard Test Probes, AC285 Grounding Clip (required for FieldSense function)

TPAK Magnetic Hanging Kit, Hard Carrying Case, Benutzerhandbuch

Modellvergleich & Auswahlhilfe

377 FC: Equipped with FieldSense, without PQ power quality screening, focused on safe and fast voltage & current measurement

378 FC: With PQ harmonic & energy efficiency screening, the top choice for maintenance of inverters, air compressors and fans

376 FC: Traditional clamp meter, no FieldSense non-contact voltage function, voltage measurement only via test probes

Bestellnummer: 5111812 (FLUKE-378 FC)

Typische Anwendungen (Automatisierung / HVAC / Low-Voltage Assemblies)

Harmonic and three-phase current imbalance screening for inverter and servo drive outputs

Measurement of startup current and locked-rotor diagnosis for three-phase motors, Luftkompressoren, water pumps and fans

High-current testing on low-voltage switchgear, busbars and large cables (2500 A via iFlex probe)

Vorausschauende Wartung, power quality pre-screening and fault location (grid side vs equipment side)

Commissioning and phase sequence verification for star-delta and soft-start circuits

Einschränkungen & Notizen

FieldSense mode requires reliable grounding. Poor grounding will cause inaccurate voltage readings; only works on single-phase conductors
The PQ function is only a screening indicator, providing pass/alarm alerts only. It cannot replace professional power quality analyzers (Fluke 43B / 437-II) for detailed THD harmonic reports
The iFlex flexible probe has a higher minimum measuring current and is not suitable for measuring tens of milliamps small currents
FieldSense cannot be used for DC voltage measurement

Upgrade & Alternative Optionen

Brand Upgrade: Fluke 43B / 437-II Power Quality Analyzer (for detailed harmonic analysis and waveform recording)

Inländisches Äquivalent: High-end clamp meters with flexible probes, Bluetooth and harmonic screening (Notiz: no FieldSense non-contact voltage function)

Ersatzteile: Separate i2500-18 probe, TP175 test probes, AC285 grounding clip

Fluke 378FC / 377FC / 376FC Note

For detailed harmonic reports, fine harmonic waveform recording and transient disturbance testing, you need professional instruments such as the Fluke 43B / 437-II.

If you frequently maintain inverters, three-phase motors and water chillers, and require safe non-contact measurement plus fast power quality troubleshooting, choose the 378 FC. If you only need non-contact measurement without PQ screening, Wählen Sie die aus 377 FC.

FC = Fluke Connect Bluetooth wireless for mobile APP data logging; non-FC models are wired-only versions.

Vollständige Modellliste (Fluke Clamp Meters)

Industrial High-End Series (370 Serie, TRMS AC/DC + iFlex high-current)

Non-Contact Voltage Models (FieldSense for safer cabinet testing)

377 FC: Non-contact voltage & current measurement, no PQ harmonic screening

378 FC (Ihr Modell): 377 FC plus PQ power quality harmonic screening, preferred for inverters & Motoren

Standard Wireless Models (No Non-Contact Voltage)

374 FC: 600 A AC/DC, supports iFlex (flexible probe not included)

375 FC: Built-in VFD low-pass filter for more accurate inverter measurement (no iFlex included)

376 FC: 1000 A AC/DC, standard with i2500 iFlex probe, max 2500 Und AC

Remote Detachable Display

381: Separable display for one-person operation in high-altitude and tight spaces, standard with iFlex

Industry-Specific Models
HVAC Special: 902 FC

For refrigeration, fans and heat pumps, with temperature measurement, CAT IV 300 V rating

PV New Energy Special: 393 FC

CAT III 1500 V DC rating, designed for PV string DC testing

Leakage Current Meters (Ground Leakage & Neutral Harmonic Current)

368 / 369 FC: Large jaw micro-amp leakage clamp meters, used for equipment earth leakage and neutral line current testing

Detachable Jaw for Tight Wiring Harnesses: 365

Separate jaw via flexible cable to access dense wiring; 200 A AC/DC true-RMS

General Economy Models (Daily Electrician Inspection)
Ultra-Thin Blade Jaw (narrow wiring): 301A/301C (Nur Wechselstrom), 301D/301E (AC+DC)
High Current for Automotive & Energiesysteme: 317, 319 (1000 A AC/DC TRMS)
Heavy-Duty High-Current Industrial Models: 353, 355 (2000 A, for transformers and busbars)
Complete Full Model List