Overview of Fluke 381 Clamp Meter

The Fluke 381 Clamp Meter is a professional-grade AC/DC testing tool featuring a remote display and iFlex® flexible current probe. It provides accurate True RMS measurements for AC/DC current, voltage, resistance, and continuity. The iFlex® probe allows flexible access to tight spaces, making it ideal for industrial, commercial, and field applications. With its ergonomic and robust design, the Fluke 381 Clamp Meter delivers precise readings while enhancing user convenience and safety in electrical diagnostics.

Other key features

• Integrated low pass filter and state-of-the-art signal processing allows for use in noisy electrical environments while providing stable readings
• Proprietary inrush measurement technology to filter out noise and capture motor starting current exactly as the circuit protection sees it
• Ergonomic design fits in your hand and can be used while wearing protective equipment
• Radio transmitter automatically sets the correct measurement range so you do not need to change the switch positions while taking a measurement
• Three-year warranty

Safety Conformance: IEC/EN 61010-1:2001, 1000V CAT III, 600V CAT IV

Specifications: Fluke 381 Remote Display True RMS AC/DC Clamp Meter with iFlex®

Electrical Specifications
AC Current via Jaw
Range	999.9 A
Resolution	0.1 A
Accuracy	2% ± 5 digits (10-100 Hz) 5% ± 5 digits (100-500 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 via Flexible Current Probe
Range	999.9 A / 2500 A (45 Hz – 500 Hz)
Resolution	0.1 A / 1 A
Accuracy	3% ± 5 digits
Crest Factor (50/60 Hz)	3.0 at 1100 A 2.5 at 1400 A 1.42 at 2500 A Add 2% for C.F. > 2
Position Sensitivity
	Distance from Optimum
		i2500-10 Flex	i2500-18 Flex	Error
	A	0.5 in (12.7 mm)	1.4 in (35.6 mm)	±0.5%
	B	0.8 in (20.3 mm)	2.0 in (50.8 mm)	±1.0%
	C	1.4 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
Range	999.9 A
Resolution	0.1 A
Accuracy	2% ± 5 digits
AC Voltage
Range	600 V /1000 V
Resolution	0.1 V / 1 V
Accuracy	1.5% ± 5 digits (20 – 500 Hz)
DC Voltage
Range	600.0 V /1000 V
Resolution	0.1 V / 1 V
Accuracy	1% ± 5 digits
Frequency – Via Jaw
Range	5.0 – 500.0 Hz
Resolution	0.1 Hz
Accuracy	0.5% ± 5 digits
Trigger Level	5 – 10 Hz, ≥ 10 A 10 – 100 Hz, ≥ 5 A 100 – 500 Hz, ≥ 10 A
Frequency via Flexible Current Probe
Range	5.0 to 500.0 Hz
Resolution	0.1 Hz
Accuracy	0.5% ± 5 digits
Trigger Level	5 to 20 Hz, ≥ 25 A 20 to 100 Hz, ≥ 20 A 100 to 500 Hz, ≥ 25 A
Resistance
Range	600 Ω/6 kΩ/60 kΩ
Resolution	0.1 Ω/1 Ω/10 Ω
Accuracy	1% ± 5 digits
Mechanical Specifications
Size (L x W x H)	277 x 88 x 43 mm (55 mm for remote unit)
Weight	350 g
Jaw Opening	34 mm
Flexible Current Probe Diameter	7.5 mm
Flexible Current Probe Cable Length (head to electronics connector)	1.8 m
Environmental Specifications
Operating Temperature	-10°C to +50°C
Storage Temperature	-40°C to +60°C
Operating Humidity	Non condensing (< 10°C) ≤ 90% RH (at 10°C to 30°C) ≤ 75% RH (at 30°C to 40°C) ≤ 45% RH (at 40°C to 50°C) (Without Condensation)
Operating Altitude	2,000 meters
Storage Altitude	12,000 meters
EMI, RFI, EMC, RF	EN 61326-1:2006, EN 61326-2-2:2006 ETSI EN 300 328 V1.7.1:2006 ETSI EN 300 489 V1.8.1:2008 FCC Part 15 Subpart C Sections 15.207, 15.209, 15.249 FCCID: T68-F381 RSS-210 IC: 6627A-F381
Temperature Coefficients	Add 0.1 x specified accuracy for each degree C above 28°C or below 18°C
Wireless Frequency	2.4 GHz ISM Band 10 meter range
Safety Compliance	ANSI/ISA S82.02.01:2004 CAN/CSA-C22.2 No. 61010-1-04 IEC/EN 61010-1:2001 to 1000V CAT III, 600V CAT IV.
Double Insulation Clearance	Per IEC 61010-2-032
Double Insulation Creepage	Per IEC 61010-1
Agency Approvals

Package Includes Fluke 381 Clamp Meter:

• 18-inch iFlex^®flexible current probe
• Coated instruction card
• Safety information sheet
• Soft carrying case
• TL75 test leads
• Five AA Alkaline batteries

Why Choose Fluke 381 Clamp Meter 

The Fluke 381 Clamp Meter is perfect for professionals needing accurate AC/DC current measurement in challenging or confined spaces. Its True RMS accuracy, remote display, and iFlex® probe make it versatile for field, industrial, and commercial electrical diagnostics. This clamp meter ensures reliability, convenience, and precision in one robust tool.