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Fluke 378 FC - Non-Contact Voltage True-rms AC/DC Clamp Meter with iFlex

Non-Contact Voltage True-rms AC/DC Clamp Meter with iFlex


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Category : Clamp Meter

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Datasheet Users Manual


Voltage and current measurements with FieldSense™ technology

The Fluke 378 FC true-rms clamp meter uses FieldSense™ technology to make testing faster and safer, all without contacting a live conductor. You get accurate voltage and current measurements through the clamp jaw. Simply clip the black test lead to any electrical ground, put the clamp jaw around the conductor and see reliable, accurate voltage and current values on the display.


Power quality indicator shows whether a problem is in the equipment or the power line

The 378 FC clamp meter includes a unique PQ function that senses power quality issues automatically. When making FieldSense measurements, the 378 FC will detect and display power quality issues, relating to current, voltage, power factor or any combination of the three. Now you can quickly determine if an upstream supply problem exists, or if there is a downstream equipment problem.


Complete 3-phase measurements in quick, easy steps

  • Complete 3-phase voltage and current tests in 3 easy steps
  • Full set of phase-to-ground and phase-to-phase values calculated and shown on the meter
  • Values are also displayed on your smartphone and saved to the cloud via Fluke Connect software
  • Phase rotation auto-calculated and shown on the Fluke Connect software
  • No more handwritten notes or complicated math.


Measure extremely high current with iFlex® probe

The included iFlex flexible current probe lets you measure ac current as high as 2500 A. Crowded wiring cabinets and large conductors are easily measured with the iFlex probe.


Easy to see, easy to use with included tools

Your job will get easier when you use the 378 FC clamp meter. The display turns green when a stable FieldSense measurement is detected. Visual Continuity also provides a bright green screen for easy detection of continuity in noisy work areas.


Record, analyze, share results with Fluke Connect® software

With Fluke Connect software you can remotely log, trend and monitor measurements to pinpoint intermittent faults. Fluke Connect also allows you to gather data as the basis for a preventive maintenance program.

  • Measure voltage and current with your clamp jaw
  • Faster, safer testing - all without touching a live wire - using FieldSense™ technology
  • Power quality indicator shows whether equipment or power line is faulty
  • Complete 3-phase voltage and current tests in 3 quick steps


General specifications

General Maximum Voltage between any Terminal and Earth Ground1000 V
Type2 AA IEC LR6 alkaline
Life200 hour
DisplayDual readout
Automatic Power Off20 minutes


Electrical (AC Current: Jaw)

Range999.9 A
Resolution0.1 A
Accuracy2 % ±5 digits (45 Hz to 66 Hz)
Crest Factor (50/60 Hz)3 @ 500 A
2.5 @ 600 A
1.42 @ 1000 A
Add 2 % for C.F. >2


AC Current: Flexible Current Probe

Range2500 A
Resolution1 A (≤2500 A) 0.1 A (≤999.9 A)
Accuracy3 % ±5 digits (5 Hz to 500 Hz)
Crest Factor (50/60Hz)3.0 at 1100 A
2.5 at 1400 A
1.42 at 2500 A
Add 2 % for C.F. >2


Position Sensitivity

reference for position sensitivity chart
Distance from Optimumi2500-10 Flexi2500-18 FlexError
A0.5 in (12.7 mm)1.4 in (35.6 mm)± 0.5 %
B0.8 in (20.3 mm)2.0 in (50.8 mm)± 1.0 %
C1.4 in (35.6 mm)2.5 in (63.5 mm)± 2.0 %

Measurement uncertainty assumes centralized primary conductor at optimum position, no external electrical or magnetic field, and within operating temperature range.


DC Current

Range999.9 A
Resolution0.1 A
Accuracy2 % ±5 digits1

[1]When using the ZERO function to compensate for offsets


AC Voltage: Field Sense

Range1000 V
Resolution1 V (≤1000V)
≤4/0 AWG3 % ±5 digits (45 Hz to 66 Hz)
≥4/0 AWG5 % ±5 digits (45 Hz to 66 Hz)

Position wire as close as possible to jaw opening (see illustration).
Wire Positioning for Fluke 378 FC Clamp Meter


AC Voltage: Test Leads

Range600.0 V 1000 V
Resolution0.1 V (≤600.0 V)
1 V (≤1000 V)
Accuracy1 % ±5 digits (20 Hz to 500 Hz)


DC Voltage

Range600.0 V
1000 V
Resolution0.1 V (≤600.0 V)
1 V (≤1000 V)
Accuracy1 % ±5 digits


mV dc

Range500.0 mV
Resolution0.1 mV
Accuracy1 % ±5 digits


Amps Frequency: Jaw

Range45 Hz to 66 Hz
Resolution0.1 Hz
Accuracy0.5 % ±5 digits
Trigger Level 5 Hz to 10 Hz, ≥10 A
10 Hz to 100 Hz, ≥ 5 A
100 Hz to 500 Hz, ≥ 10 A



Range60.00 kΩ
6000 Ω
600.0 Ω
Resolution0.1 Ω (≤600.0 Ω)
1 Ω (≤6000 Ω)
10 Ω (≤60.00 kΩ)
Accuracy1 % ±5 digits



Range1000 μF
Resolution0.1 μF (≤100.0 μF)
1 μF (≤1000 μF)
Accuracy1 % ±4 digits



Size (L x W x H)274 mm x 86 mm x 47 mm
Weight (with Batteries)463 g
Jaw Opening34 mm
Flexible Current Probe Diameter7.5 mm
Flexible Current Probe Cable Length (head to electronics connector)1.8 m
Rogowski Coil Length450 mm



Operating Temperature -10 °C to 50 °C
Storage Temperature-40 °C to 60 °C
Operating Humidity (without condensation)Non condensing (<10 °C) ≤90 % RH (10 °C to 30 °C) ≤75 % RH (30 °C to 40 °C) ≤45 % RH (40 °C to 50 °C)
Temperature CoefficientsAdd 0.1 x specified accuracy for each degree C >28 °C or <18 °C
Ingress ProtectionIEC 60529: IP30 (jaw closed)
Operating Altitude2000 m
Storage Altitude12 000 m
Electromagnetic Compatibility (EMC)
InternationalIEC 61326-1: Portable Electromagnetic Environment IEC 61326-2-2, CISPR 11: Group 1, Class B
Group 1Equipment has intentionally generated and/or uses conductively-coupled radio frequency energy that is necessary for the internal function of the equipment itself.
Class BEquipment is suitable for use in domestic establishments and in establishments directly connected to a low voltage power supply network which supplies buildings used for domestic purposes. Emissions that exceed the levels required by CISPR 11 can occur when the equipment is connected to a test object.
Korea (KCC) Class A equipment (Industrial Broadcast & Communications Equipment)
Class AEquipment meets requirements for industrial electromagnetic wave equipment and the seller or user should take notice of it. This equipment is intended for use in business environments and not to be used in homes.
USA (FCC)47 CFR 15 subpart B. This product is considered an exempt device per clause 15.103.



GeneralIEC 61010-1: Pollution degree 2
MeasurementIEC 61010-2-032: CAT III 1000 V / CAT IV 600 V
IEC 61010-2-033: CAT III 1000 V / CAT IV 600 V
Current Clamp for Leakage Current MeasurementsIEC 61557-13: Class 2, ≤30 A/m


Wireless Radio

Radio Frequency CertificationFCC ID: T68-FBLE IC:6627A-FBLE
Frequency Range2405 MHz to 2480 MHz
Output Power<100 mW
Radio Frequency DataRadio Frequency Data For Class A Devices
Hereby, Fluke declares that the radio equipment contained in this Product is in compliance with Directive 2014/53/EU. The full text of the EU declaration is available at the following internet address:


Amps Frequency: Flexible Current Probe

Range5.0 Hz to 500.0 Hz
Resolution0.1 Hz
Accuracy0.5 % ±5 digits
Trigger Level5 Hz to 20 Hz, ≥25 A
20 Hz to 100 Hz, ≥20 A
100 Hz to 500 Hz,≥25 A

Do you have a Non-Contact Voltage True-rms AC/DC Clamp Meter with iFlex that needs to be calibrated?

We offer standard traceable calibration and ISO 17025 accredited calibration services.

Get your Non-Contact Voltage True-rms AC/DC Clamp Meter with iFlex calibrated today! Click Here!


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