Fluke 368 User manual

November 2015 Rev. 1, 6/19
©2015-2019 Fluke Corporation. All rights reserved.
Specifications are subject to change without notice.
All product names are trademarks of their respective companies.
368/368 FC
369/369 FC
AC Leakage Current Clamp
Users Manual
Users Manu
a

LIMITED WARRANTY AND LIMITATION OF LIABILITY
This Fluke product will be free from defects in material and workmanship for one year 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
Fluke Corporation
P.O. Box 9090
Everett, WA 98206-9090
U.S.A.
Fluke Europe B.V.
P.O. Box 1186
5602 BD Eindhoven
The Netherlands
ООО «Флюк СИАЙЭС»
125167, г. Москва, Ленинградский
проспект дом 37,
корпус 9, подъезд 4, 1 этаж

i
Title Page
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
How to Contact Fluke . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Safety Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Product Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
The Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Manual-Range Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Clean the Product . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Replacement Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
AC Current Measurement. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Environmental Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Safety Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Wireless Radio . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Operational Error for Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Product Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Table of Contents

368/368 FC/369/369 FC
Users Manual
ii

1
Introduction
The 368/368 FC and 369/369 FC AC Leakage Current Clamp (the Product) is a handheld tool for
measurement of ac leakage current.
Principle of Leakage Current Measurement
Based on the electromagnetic induction principle, the Product has a ring-shape current transformer
comprised of a metal core and coil winding. The current transformer senses the magnetic field produced
by the current or by the vector sum of the currents flowing in the conductor under test. The current
transformer then produces a current proportional to the current flowing in the conductor.
See the Product Functions section near the end of this manual.

368/368 FC/369/369 FC
Users Manual
2
How to Contact Fluke
To contact Fluke, call one of the following telephone numbers:
• Technical Support USA: 1-800-44-FLUKE (1-800-443-5853)
• Calibration/Repair USA: 1-888-99-FLUKE (1-888-993-5853)
• Canada: 1-800-36-FLUKE (1-800-363-5853)
• Europe: [phone]
• Japan: [phone]
• Singapore: [phone]
• China: [phone]
• Brazil: [phone]
• Anywhere in the world: [phone]
Or, visit Fluke's website at www.fluke.com.
To register your product, visit http://register.fluke.com.
To view, print, or download the latest manual supplement, visit http://us.fluke.com/usen/support/manuals.
Safety Information
General Safety Information is in the printed Safety Information document that ships with the Product and
at www.fluke.com. More specific safety information is listed where applicable.

AC Leakage Current Clamp
Product Overview
3
Product Overview
Table 1 and Figure 1 explain the Product features.
Table 1. Features
Item Definition
Keep fingers below the Tactile Barrier.
Push  to retain the measured data on the display. When pushed,  shows on
the display. When pushed again, data hold is canceled and  disappears.
The display shows the measured value (digital reading), unit, function, and low battery
symbol.
Push  to choose the range of ac current (either mA or A). Push and hold  for
2 seconds to turn on the filter.
368 FC/369 FC: Log data and clear memory, see Product Functions.
368 FC/369 FC: Turn on/turn off the Fluke Connect™ wireless connectivity to a
smartphone, see Product Functions.

368/368 FC/369/369 FC
Users Manual
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Push  to show the minimum, maximum, and average reading. When pushed,
 shows on the display.
Push  to turn on the display backlight. Push and hold  for 2 seconds to turn on the
spotlight. See Spotlight.
Push  to turn on or turns off the Product.
Jaw trigger
Push the jaw lock button and the trigger together to unlock the jaw.
Spotlight. See Spotlight.
Jaw
Battery Housing holds the batteries. See Batteries.
Table 1. Features (cont.)
Item Definition

AC Leakage Current Clamp
Product Overview
5
Figure 1. Product Features
1
13
12
9
3 23
4
7
8
9
10
11
14
3
4
3
5
6

368/368 FC/369/369 FC
Users Manual
6
The Display
Table 2 and Figure 2 explain the Product display.
Table 2. Display
Item Definition
Battery Symbol
Main display
The Product is searching for ranges.
Fluke Connect on (368 FC and 369 FC)
Min, Max, or Avg reading is showing.
MinMax mode is active.
Hold mode is active.
Filter is active and filters signals from 40 Hz – 70 Hz.
mA AC or A AC
Remaining memory (368 FC and 369 FC)
Product identification number when used with Fluke Connect (368 FC and 369 FC).

AC Leakage Current Clamp
The Display
7
Figure 2. Display
1
2
3
678
5
4
9
11
10

368/368 FC/369/369 FC
Users Manual
8
Manual-Range Mode
To enable manual-range mode:
1. With the Product off, simultaneously push  and .
2. Hold both buttons until the backlight illuminates (~2 s).
The Product is now in manual-range mode.
3. Push  to select the range.
Clean the Product
Periodically wipe the case with a damp cloth and mild detergent.
W Caution
To avoid damaging the Product, do not use abrasives or solvents to clean the Product.
1. Inspect the jaw mating surface for cleanliness. If any foreign material is present, the jaw will not
close properly and measurement errors will result.
2. Open the jaws and clean the clamp metal ends with a lightly oiled cloth.

AC Leakage Current Clamp
Maintenance
9
Maintenance
If the Product does not work or perform properly, use these steps to help isolate the problem:
1. Inspect the jaw mating surface for cleanliness. If any foreign material is present, the jaw will not
close properly and measurement errors will result.
2. Verify that the range on the Product is correct.
Replacement Parts
Replacement parts are listed in Table 3. To order, see How to Contact Fluke.
Table 3. Replacement Parts
Item Description Fluke Part Number
Battery 2AA IEC LR6 Alkaline 376756
Battery door assembly
English 4700598
Chinese 4739829

368/368 FC/369/369 FC
Users Manual
10
Specifications
General
Measurement functions ........................AC current
Display (LCD) .......................................Digital reading: 3300 counts, LCD refresh rate 4x/s
Range selection....................................mA/A: manual selection
3 mA/30 mA/300 mA: auto selection
3 A/30 A/60 A: auto selection
Battery
Type ................................................. 2 AA IEC LR6 alkaline
Life.................................................... >150 hours without backlight and spotlight
Maximum conductor diameter ..............368: 40 mm, 369: 61 mm
Automatic power off..............................15 minutes after the last switch operation

AC Leakage Current Clamp
Specifications
11
Dimensions
369/369 FC (W x H x D) ................... 116 mm x 257 mm x 46 mm
368/368 FC (W x H x D) ................... 101 mm x 234 mm x 46 mm
Weight
369/369 FC....................................... 600 g
368/368 FC....................................... 500 g
Electrical Specifications
Reference Conditions...........................23 ±5 °C and 80 % RH maximum
A AC Range .........................................3 mA, 30 mA, 300 mA, 3 A, 30 A, 60 A
Frequency ............................................40 Hz to 1 kHz
Crest Factor..........................................3

368/368 FC/369/369 FC
Users Manual
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AC Current Measurement
Accuracy is specified for 1 year after calibration. Accuracy is given as ±(% reading + digit).
Range Resolution
368/368 FC 369/369 FC
T.C./°C Outside
18 °C to 28 °C
Filter On
(40-70 Hz)
Filter Off
(40-1 kHz)
Filter On
(40-70 Hz)
Filter Off
(40-1 kHz)
3 mA[1] 0.001 mA 1+5 1+5 1.5+5 1.5+5 0.002+1
30 mA 0.01 mA 1+5 1+5 1.5+5 1.5+5 0.002+1
300 mA 0.1 mA 1+5 1+5 1.5+5 1.5+5 0.002+1
3 A 0.001 A 1+5 1+5 1.5+5 1.5+5 0.002+1
30 A 0.01 A 1+5 1+5 1.5+5 1.5+5 0.002+1
60 A 0.1 A 2+5 2+5 2+5 2+5 0.002+1
[1] The minimum value is 10 μA rms.

AC Leakage Current Clamp
Specifications
13
Environmental Specifications
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)
Ingress Protection ................................IEC 60529: IP30 with jaw closed
Operating Altitude.................................2000 m
Storage Altitude....................................12 000 m
Electromagnetic Compatibility (EMC)
International...................................... IEC 61326-1: Industrial 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.

368/368 FC/369/369 FC
Users Manual
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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 usedfor 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.
Safety Specifications
General.................................................IEC61010-1: Pollution degree 2
Measurement .......................................IEC61010-2-032: CAT III 600 V
Current Clamp for Leakage Current
Measurements......................................IEC 61557-13: Class 2, ≤30 A/m

AC Leakage Current Clamp
Specifications
15
Wireless Radio
Radio Frequency Certification ..............FCC ID:T68-FBLE IC:6627A-FBLE
Frequency Range.................................2405 MHz to 2480 MHz
Output Power .......................................<100 mW
Radio Frequency Data .........................Go to www.fluke.com and search for “Radio Frequency Data for
Class A” (PN 4333628)
Operational Error for Current
Accuracy is specified for 1 year after calibration. Accuracy is given as ±(% reading).
Accuracy guaranteed for 50 Hz and 60 Hz.
Parameter Specification
Typical Max[1]
368/368 FC 369/369 FC 368/368 FC 369/369 FC
Intrinsic Uncertainty IEC 61557-13 A Reference conditions 0.08 % 0.06 % 0.15 % 0.13 %
Conductor Position IEC 61557-13 E1 ±30 ° 0.08 % 0.06 % 0.15 % 0.12 %
Battery Voltage IEC 61557-13 E2 2.0 V to 3.3 V 0.08 % 0.05 % 0.15 % 0.12 %
Temperature IEC 61557-13 E3 -10 °Cto 50 °C 0.14 % 0.14 % 0.29 % 0.29 %
Distortion IEC 61557-13 E9 0.06 % 0.07 % 0.15 % 0.12 %

368/368 FC/369/369 FC
Users Manual
16
Magnetic Field
IEC 61557-13 E11 (15 Hz to 400 Hz)
10 A/m Class 3
30 A/m Class 2
1.58 %
4.75 %
2.07 %
6.21 %
3.54 %
10.61 %
3.31 %
9.96 %
Load Current IEC 61557-13 E12
60 A rms max (50 Hz and 60 Hz) 3.60 % 5.17 % 7.67 % 10.83 %
Touch Current IEC 61557-13 E13 CAT III 600 V/ 60 Hz 0.94 % 0.06 % 1.61 % 0.14 %
Frequency IEC 61557-13 E14 40 Hz to 1 kHz 0.15 % 0.15 % 0.30 % 0.32 %
Repeatability IEC 61557-13 E15 0.08 % 0.06 % 0.15 % 0.12 %
Uncertainty
IEC 61557-13 B
10A/m Class 3
30A/m Class 2
4.74 %
7.02 %
6.47 %
9.36 % 10.06 %
15.34 %
13.16 %
17.05%
[1] Confidence level: 95 %.
Parameter Specification
Typical Max[1]
368/368 FC 369/369 FC 368/368 FC 369/369 FC