Fluke 374 FC User manual

PN 4705494
September 2015
© 2015 Fluke Corporation. All rights reserved. Specifications are subject to change without notice.
All product names are trademarks of their respective companies.
374 FC/375 FC/376 FC
Clamp Meter
99 Washington Street
Melrose, MA 02176
800.517.8431
TestEquipmentDepot.com

LIMITED WARRANTY AND LIMITATION OF LIABILITY
This Fluke product will be free from defects in material and workmanship for three
years from the date of purchase. This warranty does not cover fuses, disposable
batteries, or damage from accident, neglect, misuse, alteration, contamination, or
abnormal conditions of operation or handling. Resellers are not authorized to extend
any other warranty on Fluke’s behalf. To obtain service during the warranty period,
contact your nearest Fluke authorized service center to obtain return authorization
information, then send the product to that Service Center with a description of the
problem.
THIS WARRANTY IS YOUR ONLY REMEDY. NO OTHER WARRANTIES, SUCH AS
FITNESS FOR A PARTICULAR PURPOSE, ARE EXPRESSED OR IMPLIED. FLUKE
IS NOT LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL OR
CONSEQUENTIAL DAMAGES OR LOSSES, ARISING FROM ANY CAUSE OR
THEORY. Since some states or countries do not allow the exclusion or limitation of an
implied warranty or of incidental or consequential damages, this limitation of liability
may not apply to you.
11/99

i
Table of Contents
Title Page
Introduction................................................................................................................. 1
Contact Fluke ............................................................................................................. 2
Safety Information ...................................................................................................... 3
Replacement Part List................................................................................................ 9
The Product................................................................................................................ 10
Specifications ............................................................................................................. 22

374 FC/375 FC/376 FC
Users Manual
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1
Introduction
The Fluke 374 FC/375 FC/376 FC (the Product) measures true-rms ac current and voltage, dc
current and voltage, inrush current, resistance, and capacitance. The 375 FC and 376 FC also
measure frequency and dc millivolts. The detachable iFlex (Flexible Current Probe) that is
included with the 376 FC (optional with the 374 FC and 375 FC) expands the measurement range
to 2500 A ac. The Flexible Current Probe provides increased display flexibility and allows
measurements of awkward sized conductors and improved wire access. The illustrations in this
manual show the 376 FC.

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Users Manual
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Clamp Meters
Safety Information
3
Safety Information
A Warning identifies conditions and procedures that are dangerous to the user. A Caution
identifies conditions and procedures that can cause damage to the Product or the equipment
under test.
Symbols used on the Product and in this manual are explained in Table 1.
XWWarning
To prevent possible electrical shock, fire, or personal injury:
•Carefully read all instructions.
•Read all safety information before you use the Product.
•Use the Product only as specified, or the protection supplied by the Product can
be compromised.
•Do not use the Product around explosive gas, vapor, or in damp or wet
environments.
•Do not use and disable the Product if it is damaged.
•Do not use the Product if it operates incorrectly.
•Use only correct measurement category (CAT), voltage, and amperage rated
probes, test leads, and adapters for the measurement.

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Users Manual
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•Do not exceed the Measurement Category (CAT) rating of the lowest rated
individual component of a Product, probe, or accessory.
•Comply with local and national safety codes. Use personal protective equipment
(approved rubber gloves, face protection, and flame-resistant clothes) to prevent
shock and arc blast injury where hazardous live conductors are exposed.
•Before each use, examine the Product. Look for cracks or missing pieces of the
clamp housing or output cable insulation. Also look for loose or weakened
components. Carefully examine the insulation around the jaws.
•Do not use test leads if they are damaged. Examine the test leads for damaged
insulation and measure a known voltage.
•Do not touch voltages >30 V ac rms, 42 V ac peak, or 60 V dc.
•Do not measure current while the test leads are in the input jacks.
•Do not apply more than the rated voltage, between the terminals or between each
terminal and earth ground.
•De-energize the circuit or wear personal protective equipment in compliance with
local requirements before you apply or remove the Flexible Current Probe.
•Measure a known voltage first to make sure that the Product operates correctly.
•Limit operation to the specified measurement category, voltage, or amperage
ratings.
•The battery door must be closed and locked before you operate the Product.

Clamp Meters
Safety Information
5
•Connect the common test lead before the live test lead and remove the live test
lead before the common test lead.
•Remove all probes, test leads, and accessories before the battery door is
opened.
•Keep fingers behind the finger guards on the probes.
•Hold the Product behind the tactile barrier.
•Replace the batteries when the low battery indicator shows to prevent incorrect
measurements.
•Do not use the HOLD function to measure unknown potentials. When HOLD is
turned on, the display does not change when a different potential is measured.
•Disconnect power and discharge all high-voltage capacitors before you measure
resistance, continuity, capacitance, or a diode junction.
•Remove the input signals before you clean the Product.
•Use only specified replacement parts.
•When batteries are changed, ensure that the calibration seal in the battery
compartment is not damaged. If damaged, the Product may not be safe to use.
Return the Product to Fluke for replacement of the seal.
•Do not use in CAT III or CAT IV environments without the protective cap of test
probe, The protective cap decreases the expose probe metal < 4mm. This
decreases the possibility of arc flash from short circuits.
•Do not place magnet inside Category IV panel. Place it outside the panel instead.

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Users Manual
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For safe operation and maintenance of the Product:
•Repair the Product before use if the battery leaks.
•Have an approved technician repair the Product.
WCaution
To avoid possible damage to the Product or to equipment under test:
•Use the proper jacks, function, and range for the measurement application.
•Clean the case and accessories with a damp cloth and mild detergent only.
Do not use abrasives or solvents.
Note
The Measurement Category (CAT) and voltage rating of any combination of test
probe, test probe accessory, current clamp accessory, and the Product is the
LOWEST rating of any individual component.