Fluke 377 FC Non-Contact Voltage True-rms AC/DC Clamp Meter with iFlex

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Voltage and current measurements with FieldSense™ technology

The Fluke 377 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.

Measure extremely high current with iFlex® probe

Use the included iFlex flexible current probe to measure ac current as high as 2500 A. The iFlex probe provides access to large conductors in tight spaces.

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 smart phone and saved to the cloud via Fluke Connect software
  • Phase rotation auto-calculated and shown on the Fluke Connect software
  • No more hand-written notes or complicated math.

Easy to see, easy to use with included tools

Your job will get easier when you use the 377 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.

General specifications
General Maximum Voltage between any Terminal and Earth Ground1000 V
BatteryType2 AA IEC LR6 alkaline
Life200 hour
DisplayDual readout
Automatic Power Off20 minutes
AC Current: Jaw
Range999.9 A
Resolution0.1 A
Accuracy2 % ±5 digits (10 Hz to 100 Hz)
2.5 % ±5 digits (100 Hz to 500 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
Flexible current probeDistance 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)
Accuracy?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).
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
Range5.0 Hz to 500.0 Hz
Resolution0.1 Hz
Accuracy0.5 % ±5 digits
Trigger Level5 Hz to 10 Hz, ?10 A
10 Hz to 100 Hz, ? 5 A
100 Hz to 500 Hz, ? 10 A
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
Range60.00 k?
6000 ?
600.0 ?
Resolution0.1 ? (?600.0 ?)
1 ? (?6000 ?)
10 ? (?60.00 k?)
Accuracy1 % ±5 digits
Range1000 ?F
Resolution0.1 ?F (?100.0 ?F)
1 ?F (?1000 ?F)
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 1: Equipment has intentionally generated and/or uses conductively-coupled radio frequency energy that is necessary for the internal function of the equipment itself.
Class B: Equipment 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 A: Equipment 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: https://dam-assets.fluke.com/s3fs-public/FLK_RED_1aeng0900.pdf.