Fluke 374 FC User manual

September 2015 Rev. 1, 9/19
© 2015-2019 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 Meters
Users Manual
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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
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i
Table of Contents
Title Page
Introduction ................................................................................................................. 1
Contact Fluke ............................................................................................................. 2
Safety Information ...................................................................................................... 3
Replacement Part List ................................................................................................ 9
The Product ................................................................................................................ 10
Specifications ............................................................................................................. 22
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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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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.
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374 FC/375 FC/376 FC
Users Manual
4
• Prior to use, ensure the Product is clean, dry, and in good repair. Do not use the
product if has been exposed to water, cleaning solutions, battery electrolyte
leakage, or other contaminants that may have entered the enclosure. These
contaminants can reduce or eliminate the protection provided by the Product
against electric shock or arc explosion. Have the product dried, cleaned, or
repaired as necessary to ensure continued safe operation
• Use only correct measurement category (CAT), voltage, and amperage rated
probes, test leads, and adapters for the measurement.
• 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.
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Clamp Meters
Safety Information
5
• 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.
• 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.
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374 FC/375 FC/376 FC
Users Manual
6
• 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 exposed 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.
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.
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Clamp Meters
Safety Information
7
Table 1. Symbols
Symbol Meaning Symbol Meaning
 AC (Alternating Current)  Earth
 DC (Direct Current) X WARNING. HAZARDOUS VOLTAGE.
Risk of electric shock.
P Conforms to European Union
directives. W WARNING. RISK OF DANGER.
 Consult user documentation.  Battery. Low battery when shown on
display.
T Double Insulated ,
Application around and removal from
uninsulated hazardous live conductors is
permitted.
 Conforms to relevant Australian
EMC standards. ) Certified by CSA Group to North American safety standards.
-
Do not apply to or remove from HAZARDOUS LIVE conductors. Do not apply around
or remove from uninsulated hazardous live conductors without taking additional
protective measures.
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374 FC/375 FC/376 FC
Users Manual
8
Table 2. Symbols (Cont.)
Symbol Meaning

Measurement Category II is applicable to test and measuring circuits connected
directly to utilization points (socket outlets and similar points) of the low-voltage
MAINS installation.
 Measurement Category III is applicable to test and measuring circuits connected to
the distribution part of the building’s low-voltage MAINS installation.
 Measurement Category IV is applicable to test and measuring circuits connected at
the source of the building’s low-voltage MAINS installation.
~
This product complies with the WEEE Directive marking requirements. The affixed
label indicates that you must not discard this electrical/electronic product in domestic
household waste. Product Category: With reference to the equipment types in the
WEEE Directive Annex I, this product is classed as category 9 "Monitoring and
Control Instrumentation" product. Do not dispose of this product as unsorted
municipal waste.
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Clamp Meters
Replacement Part List
9
Replacement Part List
Table 3 lists the available replacement parts.
Table 3. Replacement Parts
Item Qty. Fluke Part or Model Number
Battery, AA 1.5 V 2 376756
Battery Door Assembly 1 4696918
Test lead set 1 TL75
Flexible current probe i2500-10 1 3676410
Flexible current probe i2500-18 1 3798105
Magnet strap 1 669952
STRAP 9 INCHES 1 669960
Soft Case 1 3752958
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374 FC/375 FC/376 FC
Users Manual
10
The Product
1Clamp Meter
fig01.emf
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Clamp Meters
The Product
11
20
ON
ON
Auto Power Off Backlight
fig02_3.emf
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374 FC/375 FC/376 FC
Users Manual
12
Display Hold MIN MAX AVG
1x
=
2x
=
3x
=
2 sec = Exit
fig04_5.emf
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Clamp Meters
The Product
13
2 sec = LOG
5 sec
+ ON +
x1 x2
LOG (375 FC and 376 FC) Clear Memory (375 FC and 376 FC)
fig_16.emf
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374 FC/375 FC/376 FC
Users Manual
14
6Flexible Current Probe
<0.5 A >0.5 A
fig06.emf
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Clamp Meters
The Product
15
7
Jaw Hz
(375 FC & 376 FC)
> 5 A
> 20 A
<0.5 A >0.5 A
fig07.emf
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374 FC/375 FC/376 FC
Users Manual
16
<0.5 A >0.5 A
Fig08.emf
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Clamp Meters
The Product
17
mV dc (375 FC & 376 FC)
fig09_10.emf
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374 FC/375 FC/376 FC
Users Manual
18
eR
<30
ON
Fig15.emf
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