Fluke 381 User Manual
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Fluke 381 User Manual

Remote display true-rms clamp meter
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381
Remote Display True-rms Clamp Meter
Users Manual
July 2010 Rev. 1, 11/23 (English)
©2010-2023 Fluke Corporation. All rights reserved.
Specifications are subject to change without notice.
All product names are trademarks of their respective companies.

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Summary of Contents for Fluke 381

  • Page 1 Remote Display True-rms Clamp Meter Users Manual July 2010 Rev. 1, 11/23 (English) ©2010-2023 Fluke Corporation. All rights reserved. Specifications are subject to change without notice. All product names are trademarks of their respective companies.
  • Page 2 Fluke authorized resellers shall extend this warranty on new and unused products to end-user customers only but have no authority to extend a greater or different warranty on behalf of Fluke. Warranty support is available only if product is purchased through a Fluke authorized sales outlet or Buyer has paid the applicable international price.

  • Page 3: Table Of Contents

    Table of Contents Title Page Introduction........................... Contact Fluke ..........................Safety Information........................Radio Frequency Data....................... Features............................Remote Display........................Hazardous Voltage Indicator ..................Flexible Current Probe ..................... Auto Power Off........................Backlight ..........................Display Hold ......................... MIN MAX AVG ........................DC Current Zero .........................
  • Page 4 Users Manual...

  • Page 5: Introduction

    Introduction The Fluke 381 Remote Display True-rms Clamp Meter (the Product or Meter) is a handheld, battery-operated Clamp Meter (the Meter) that has a remote-display module and detachable iFlex (Flexible Current Probe). The Remote Display can be removed from the Meter body and read away from the measurement source.
  • Page 6 Users Manual Class B digital device: A digital device that is marketed for operation in a residential environment not withstanding use in commercial, business and industrial environments. Examples of such devices include, but are not limited to, personal computers, calculators, and equivalent electronic devices that are marketed for operation by the general public.

  • Page 7: Features

    Remote Display True-rms Clamp Meter Features Features The following sections explain the Meter features in detail. Remote Display The Meter uses low-power 802.15.4 wireless technology to let the display module operate in a different location than the Meter base. Although there is control of some Meter functions (Hold, MIN MAX AVG, and Backlight), complete remote control of the Meter is not available through the display module.

  • Page 8: Hazardous Voltage Indicator

    Users Manual Hazardous Voltage Indicator During a voltage measurement, the Meter alerts you to the presence of a potentially hazardous voltage. When the Meter senses a voltage ±30 V or a voltage overload (OL), Y is shown on the display and the red high-voltage LED ( ) on the Meter base illuminates to tell you a hazardous voltage is at the Meter input.

  • Page 9: Backlight

    Remote Display True-rms Clamp Meter Features Backlight Push to toggle the Backlight on and off. The Backlight automatically goes off after 2 minutes. To disable the Backlight Auto Off feature, hold down while turning on the Meter. Display Hold To capture and hold the present display reading, push while taking a reading.
  • Page 10 Users Manual Table 1. Meter Features Item Description Current Sensing Jaw Tactile Barrier Rotary Function Switch, see Table 2 Hazardous-voltage indicator Display release button Display, see Table 3 Backlight button: turns the Backlight on and off. The Backlight stays on for 2 minutes when there is no button or switch interaction and then shuts off.

  • Page 11: Display

    Remote Display True-rms Clamp Meter Features Table 2. Rotary Function Switch Switch Position Function Meter is powered down AC voltage DC voltage Resistance and continuity AC current. Push to shift to frequency. DC current AC current and frequency measurement using the Flexible Current Probe.

  • Page 12: Measurements

    Users Manual Measurements Note Prior to first use, remove the battery isolator (small piece of plastic between the batteries and battery contacts). AC and DC Current (Jaw) XW Warning To prevent electric shock or personal injury: When making current measurements, disconnect the test leads from the Meter. ...

  • Page 13: Ac Current (Flexible Current Probe)

    Remote Display True-rms Clamp Meter Measurements 5. View the reading on the display. Figure Note Current flowing in opposite directions cancels each other. If current is moving in opposite directions, place one conductor into the clamp at a time. See Figure Figure 2.
  • Page 14 Users Manual 3. Keep the probe coupling more than 2.5 cm (1 inch) away from the conductor. 4. Turn the Rotary Function Switch to . When the Rotary Function Switch is in the correct position, shows on the display to indicate that the readings are from the Flexible Current Probe.

  • Page 15: Ac And Dc Voltage

    Remote Display True-rms Clamp Meter Measurements AC and DC Voltage To measure ac or dc voltage: 1. Turn the Rotary Function Switch to the proper voltage function ( 2. Connect the black test lead to the COM terminal and the red test lead to the terminal.

  • Page 16: Inrush Current Measurement (Jaw And Flexible Current Probe)

    Users Manual Inrush Current Measurement (Jaw and Flexible Current Probe) The Meter can capture the initial inrush current when starting a device such as a motor or light ballast. To measure the inrush current: 1. With the device under test off, turn the Meter Rotary Function Switch to , or the Flexible Current Probe is being used for the measurement.

  • Page 17: Maintenance

    Remote Display True-rms Clamp Meter Maintenance Maintenance XW Warning To prevent possible electric shock or personal injury, repairs or servicing not covered in this manual should be performed only by qualified personnel. Cleaning the Meter and Flexible Current Probe XW Warning To prevent electrical shock, remove any input signals before cleaning.

  • Page 18: Product Disposal

    If this Product has an integral battery, put the entire Product in the electrical waste.  User-Replaceable Parts Table 4. User-Replaceable Parts Description Qty. Fluke Part Number Battery, AAA 1.5 V 2838018 Battery Door - Display Module 3625529 Battery Door - Meter Base...

  • Page 19: Specifications

    Remote Display True-rms Clamp Meter Specifications Specifications Electrical Specifications Temperature Coefficients, add 0.1 x specified accuracy for each degree C >28 °C or <18 °C. AC Current Via Jaw Range..............999.9 A Resolution ............0.1 A Accuracy.............. 2 % ±5 digits (10 Hz to 100 Hz) 5 % ±5 digits (100 Hz to 500 Hz) Crest Factor (50/60 Hz)........

  • Page 20: Mechanical Specifications

    Users Manual 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 Hz to 500 Hz) DC Voltage Range..............

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