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377 FC
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Fluke 377, 377 FC, 378, 378 FC User Manual

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Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176 - TestEquipmentDepot.com

377/377 FC 378/378 FC

Clamp Meter
September 2020
©2020 Fluke Corporation. All rights reserved. All product names are trademarks of their respective companies.
Users Manual

LIMITED WARRANTY AND LIMITATION OF LIABILITY

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. Fluke reserves the right to invoice Buyer for importation costs of repair/replacement parts when product purchased in one country is submitted for repair in another country.
Fluke's warranty obligation is limited, at Fluke's option, to refund of the purchase price, free of charge repair, or replacement of a defective product which is returned to a Fluke authorized service center within the warranty period.
To obtain warranty service, 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 difficulty, postage and insurance prepaid (FOB Destination). Fluke assumes no risk for damage in transit. Following warranty repair, the product will be returned to Buyer, transportation prepaid (FOB Destination). If Fluke determines that failure was caused by neglect, misuse, contamination, alteration, accident, or abnormal condition of operation or handling, including overvoltage failures caused by use outside the product’s specified rating, or normal wear and tear of mechanical components, Fluke will provide an estimate of repair costs and obtain authorization before commencing the work. Following repair, the product will be returned to the Buyer transportation prepaid and the Buyer will be billed for the repair and return transportation charges (FOB Shipping Point).
THIS WARRANTY IS BUYER'S SOLE AND EXCLUSIVE REMEDY AND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. FLUKE SHALL NOT BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL OR CONSEQUENTIAL DAMAGES OR LOSSES, INCLUDING LOSS OF DATA, ARISING FROM ANY CAUSE OR THEORY.
Since some countries or states do not allow limitation of the term of an implied warranty, or exclusion or limitation of incidental or consequential damages, the limitations and exclusions of this warranty may not apply to every buyer. If any provision of this Warranty is held invalid or unenforceable by a court or other decision-maker of competent jurisdiction, such holding will not affect the validity or enforceability of any other provision.
Fluke Corporation P.O. Box 9090 Everett, WA 98206-9090 U.S.A.
11/99

Table of Contents

Title Page
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Contact Fluke . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Safety Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Before You Start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Terms to Know. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Fluke Connect™ (377 FC/378 FC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Radio Frequency Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Fluke Connect™ App . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Features/Buttons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Auto Power Off . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Backlight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Power-On Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Maintenance Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Basic Measurements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Hazardous Voltage Indicator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Field Sense Measurement. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Field Sense AC Current, Voltage, and Frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
L1-L2-L3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Power Health Indicator (378/378 FC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
i
377/377 FC/378/378 FC
Users Manual
AC/DC Voltage Measurement with Test Leads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Resistance/Continuity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Capacitance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
DC Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
iFlex Probe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Measurement Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Display Hold . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
MIN/MAX/AVG Measurements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Inrush Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Data Logging (377 FC/378 FC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Clear Memory (377 FC/378 FC). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Firmware Update (377 FC/378 FC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Firmware Version . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
How to Clean the Case . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Environmental . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
ii

Introduction

The Fluke 377, 377 FC, 378, and 378 FC Current Clamp (the Clamp or Product) provides:
• display with two simultaneous measurements (current and voltage)
• grounding with a single lead
• live measurements with no circuit downtime
• non-contact voltage technology (measurement for Power Health Indicator, power factor, and real power)
• wireless connectivity to smartphone for work-orders and reporting integration with Fluke Connect™
Table 1. Features by Model
Model 377 378 377 FC 378 FC
The Clamp measures true-rms ac current and voltage, dc current and voltage, inrush current, resistance, capacitance, frequency, and dc millivolts.
The included iFlex (detachable, flexible current-probe) expands the measurement range to 2500 A ac. The iFlex allows measurements of awkward sized conductors and improved wire access.
The illustrations in this manual show the 378 FC.
Table 1 is a list of features available for each model.
BLE for FC
Power Heath Indicator
Phase Rotation
Sequential phase - NC voltage measurement
Phase-to-phase voltage calculation
True RMS
Logging
••
••
App Only App Only
••••
••••
••••
••
1
377/377 FC/378/378 FC
Users Manual
2

Before You Start

Table 2 is a list of items included with the Product. Use Table 3 to order additional accessories.
Table 2. Standard Equipment
Clamp Meter
Before You Start
1
2
Item Model Number Description
varies Clamp Meter
i2500-18 iFlex Flexible Current Probe 18 in (48 cm)
TPAK Hanging Kit
AC285 Alligator Clips (one pair, red and black)
TL224 Insulated Test Leads
3
4
5
6
TP220 Industrial Test Probes
3
377/377 FC/378/378 FC
Users Manual
Table 3. Accessories
Item Model Number Description
C550 Tool Bag
AC87 Heavy-Duty Bus Bar Clip Set (one pair: red and black)
AC89 Heavy-Duty Insulation Piercing Test Clip
LVD1 Volt Light
L206 LED Hat Light
TL75 Hard Point Test Lead Set (one pair: red and black)
4
Clamp Meter
Before You Start

Terms to Know

Use this section to familiarize yourself with these terms that are unique to this Product.
Field Sense/Non-contact voltage (NCV) measurement. Voltage measurements by capacitive sensing technology complete galvanic isolation. This technology uses capacitive sensors for measuring AC voltages via non-galvanic contact, coupled with a Hall Effect jaw that allows simultaneous current measurements. It enables minimizing voltage probes connections, therefore reducing hazardous situations and saving setup-up time, and circuit or machine downtime. Fluke-developed icon for Field Sense is U.
L1-L2-L3. L1, L2, and L3 (or Line 1, Line 2, and Line 3) is a common naming convention for the wires in three-phase alternating current (ac) systems. The Clamp features a sequential line-to-ground measurement that results in a calculated voltage measurement. This voltage measurement is an indication that the three-phase system is, or is not, working as expected.
Fluke Connect™. Fluke Connect is a system that wirelessly connects your Clamp with an app on your smartphone or tablet.
THD. The total harmonic distortion is a measurement of the harmonic distortion present in a signal and is defined as the ratio of the sum of the powers of all harmonic components to the power of the fundamental frequency.

Fluke Connect™ (377 FC/378 FC)

The Clamp supports the Fluke Connect™ Wireless System (may not be available in all regions). Fluke Connect is a system that wirelessly connects your Clamp with an app on your smartphone or tablet. The app shows the measurements and calculations on your smartphone or tablet display. You can save these measurements, calculations, and images to Fluke Connect™ Cloud storage and share with your team.
Fluke Connect™ uses low-power 802.15.4 wireless radio technology to connect the Clamp with an app on your smartphone or tablet. The wireless radio does not cause interference with Clamp measurements.

Radio Frequency Data

Note
Changes or modifications to the wireless 2.4 GHz radio not expressly approved by Fluke Corporation could void the user’s authority to operate the equipment.
SIMPLIFIED EU DECLARATION OF CONFORMITY
Hereby, Fluke declares that the radio equipment contained in this Product is in compliance with Directive 2014/53/EU.

Fluke Connect™ App

The Fluke Connect™ app works with Apple and Android mobile products. The app is available for download to your smart device from the Apple App Store and Google Play.
To use Fluke Connect:
1. Turn on the Clamp. See Figure XXX.
2. Push
3. On your smartphone, go to Settings > Bluetooth.
4. Verify that Bluetooth is turned on.
5. Go to the Fluke Connect App and in the list of connected
F to activate the radio on the Clamp. E shows on the
display.
Fluke tools, select 377 FC/378 FC.
5
377/377 FC/378/378 FC
Users Manual

Battery

XW Warning
To prevent personal injury and for safe operation of the Product:
• The battery door must be closed and locked before you operate the Product.
• Remove all probes, test leads, and accessories before the battery door is opened.
• Replace the batteries when the low battery indicator shows to prevent incorrect measurements.
• 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.
W Caution
To prevent damage to the battery:
• Repair the Product before use if the battery leaks.
• Do not expose battery to heat sources or high­temperature environments such as an unattended vehicle in the sun.
• Always operate in the specified temperature range.
• Do not incinerate the Product and/or battery.
Figure 1. Battery
AA
To install the batteries:
1. Open the battery door. See Figure 1.
2. Insert the batteries.
3. Close the battery door. Make sure the door is firmly closed.
6

Features/Buttons

1
2
3
4
5
6
9
10
11
12
7
8
Table 4 is a list of features and controls.
Clamp Meter
Before You Start
Table 4. Feature/Control Descriptions
Item Description
Jaw with Field Sense U
Tactile Barrier
Hold
Control Knob
Display
Function Shift: extends the function selection to yellow items on the Control Knob. Push >2 s. to turn on/turn off the backlight.
Volts/Ohm input terminal
Common terminal
Min/Max/Av for current, voltage, and frequency measurement functions. Push >2 s. to turn on/turn off the Phase-to-Phase measurement function
INRUSH: push to enter inrush mode. Push a second time to exit inrush mode. Integration time is 100 ms. Push >2 s. to start data logging function with the Fluke Connect mobile app.
Turn on/turn off Fluke Connect. The button turns blue and flashes when paired with the Fluke Connect mobile phone app. Push >2 s. to save a measurement to the Fluke Connect mobile app.
Jaw release
7
377/377 FC/378/378 FC
1
2
3
4
7
8
9
6
10
14
11
12
13
15
16
17
18
19
5
Users Manual

Display

Table 5 is a list of the display annunciators.
Table 5. Display
Item Description
8
Clamp senses a voltage ±30 V or a voltage overload (OL)
L1, L2, L3 mode is active
Clamp requires a ground connection
Jaw measurement
Fluke Connect is on
iFlex measurement
Field Sense measurement
Remaining memory (377 FC/378 FC)
Inrush measurement
Log mode is active (377 FC/378 FC)
Hold mode is active
MinMax mode is active
Battery status
Min, Max, or Avg measurement indication
Continuity indication
Power Health indication
Current measurement
Line calculation
Voltage measurement
Clamp Meter

Power

Power
Two AA batteries supply power to the Clamp.
To turn on the Clamp, rotate the control knob to a function.
To turn off the Clamp, rotate the control knob to OFF.

Auto Power Off

The Clamp automatically powers off after 20 minutes of no use. If the Clamp automatically powers off, turn the Control Knob to OFF and then to a function.
To disable auto power off, see Power-On Options.
Note
Auto power off is always disabled when you use the Min/Max/Avg function.

Backlight

The display on the Clamp includes a backlight that improves the readability in dim work areas.
To turn on the backlight, hold B for >2 seconds.
To turn off the backlight, hold B for >2 seconds.
The backlight has an auto off feature that turns off the backlight after 2 minutes of no use. To disable the auto off backlight feature, see Power-On Options.
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377/377 FC/378/378 FC
Users Manual

Power-On Options

Power-on options allow you to customize the controls:
• Turn off/turn on audible beeper
• Turn off/turn on auto backlight
• Turn on/turn off auto power shutoff
• Clear Logging Memory
•Set PQ Level
To select a power-on option:
1. Turn off the Clamp.
2. Push and hold
The Clamp goes into the option mode.
Anytime you release mode but retains any changes to the settings.
3. Push
B to go through the options.
e as you turn the control knob to V.
Note
e the Clamp exits the option
4. Push M to change a setting.
Option Display
Beeper Enabled
Beeper Disabled
Auto Backlight On (Backlight turns off after 2 minutes of no use)
Auto Backlight Off (Backlight stays on)
Auto Power On (Clamp powers off after 20 minutes of no use)
Auto Power Off (Auto Power Off is disabled)
Clear Logging Memory
Maintenance Mode: set PQ Power Level
PQ Level
5. Release
All power-on options are canceled when you turn off the Clamp with the exception of PQ Level setting.
e to exit the options mode.
bEEP On
bEEP OFF
8CLt On
8CLt OFF
AUtO On
AUtO OFF
CLr
nmAt nm0d
LEU HI LEU nmEd LEU L0
10
Clamp Meter
Power

Maintenance Mode

In Maintenance Mode you can check:
• LCD segments
•Firmware version
• Battery status annunciators
• Fluke Connect LED
• Backlight
To enter Maintenance Mode:
1. Turn off the Clamp.
2. Push and hold
The Clamp goes into the option mode.
3. Push B until nmAt nm0d shows on the display.
All LCD segments turn on and the backlight turns off.
4. Release e.
All LCD segments continue to show on the display.
5. Press
e again to show the firmware version.
e as you turn the control knob to V.
6. Continue to press e to cycle through:
• Empty battery annunciator
• 25 % battery annunciator
• 50 % battery annunciator
• 75% battery annunciator
• Blue LED + live battery annunciator (for FC model only, step is skipped for non-FC model)
• White backlight + live battery annunciator
• Green backlight + live battery annunciator
7. Press
8. Press
To exit Maintenance Mode at any time, turn off the Meter.
e again to show CAL on the display.
For more information about calibration, see the 377/377 FC/378/378 FC Calibration Manual.
e again to loop back to show all LCD segments
(step 4).
11
377/377 FC/378/378 FC
34 mm Ø
8.2 mm Ø
3.3 mm Ø
L1 L2 L3
Users Manual

Basic Measurements

Before you use the Clamp for the first time, remove the battery isolator between the batteries and battery contacts.
XW Warning
To prevent possible electrical shock, fire, or personal injury:
• Hold the Product behind the tactile barrier.
• Do not measure current while the test leads are in the input jacks.

Hazardous Voltage Indicator

When the Clamp senses a voltage ±30 V or a voltage overload (OL),
Z shows on the display to tell you a hazardous voltage is at
the Clamp input.

Field Sense Measurement

Field Sense, or Non-contact voltage (NCV) measurement, is ac voltage, current, and frequency measurement with no electrical contact to live voltage. The Clamp display shows the voltage and current measurements at the same time.
Note
All Field Sense measurements require a ground lead connection.

Field Sense AC Current, Voltage, and Frequency

To make the measurement:
1. Insert the ground lead into the COM input and attach the alligator clip to ground.
2. Rotate the control knob to
The display shows the
3. Use the jaw release to open the jaw and position the Clamp around the conductor. Close the jaw and make sure the wire position is correct. See Figure 2.
U.
U icon.
Figure 2. Wire Placement
The display shows from the jaw. When the current measurement is <0.5 A, the center dot in the icon flashes. For current measurements >0.5 A, the center dot in the icon is steady.
B to toggle on/off the Hz function shown in
Use yellow at the control knob position.
C to indicate that the measurement is
Note
12
Clamp Meter
Basic Measurements

L1-L2-L3

Three-phase alternating current (ac) systems are universally used to distribute electrical power and to supply electricity directly to high-power equipment. Use the Clamp to make a sequential line­to-ground measurement that results in a calculated voltage measurement. This voltage measurement is an indication that the three-phase system is, or is not, working as expected.
The Clamp also indicates the phase rotation as 1-2-3 or 3-2-1 in the three-phase system.
To setup:
1. Turn the control knob to U.
2. Connect the Clamp to ground with the ground lead.
3. Push
To test:
1. Position the Clamp jaw around the first conductor.
2. Move the Clamp jaw to the second conductor within
3. Move the Clamp jaw to the next conductor within 10 seconds.
M for >2 seconds. The Clamp is in the line-to-line
mode and
Wait for the measurement on the display to settle. on the display.
10 seconds.
Wait for the measurement on the display to settle. y shows on the display.
Wait for the measurement on the display to settle. on the display.
x-y-z shows on the display.
x shows
z shows
When the x-y-z measurements are complete, use the Clamp to calculate the total voltage between each pair of conductors:
1. Push
2. Push
3. Push
While in the line-to-line mode, you can review each line-to-ground measurement:
1. Push M again to show the L1 measurement.
2. Push
3. Push
To review L1-L2-L3 measurements, continue to push scroll through the measurements.
To exit the phase-to-phase mode, push
M. The displays shows the total voltage between L1
and L2.
M again to show the total voltage between L2 and
L3.
M again to show the total voltage between L3 and
L1.
M again to show the L2 measurement.
M again to show the L3 measurement.
M and
M for >2 seconds.
13
377/377 FC/378/378 FC
Users Manual

Power Health Indicator (378/378 FC)

The Power Health indicator shows that the ratio of the real power compared to the apparent power or harmonic distortion is outside the optimal range.
To setup:
1. Turn the control knob to U.
2. Connect the Clamp to ground with the ground lead.
If THD for PQ volts or PQ current or the power factor (PQ PF) is outside the optimal range, the related indicator shows on the display.
Fluke Connect supports the Power Health indicator.

AC/DC Voltage Measurement with Test Leads

To measure ac or dc voltage:
1. Turn control knob to
2. Connect the black test lead to the COM terminal and the red test lead to the
3. Touch the probes to the test points of the circuit.
The display shows the measurement.
B to toggle on/off the mV function shown in
Use yellow at the control knob position.
V or N.
VX terminal. See Figure XX.
Note

Resistance/Continuity

To measure resistance or continuity:
1. Turn the control knob to
2. Remove power from the circuit to test.
3. Connect the black test lead to the COM terminal and the red test lead to the
4. Touch the probes to the test points of the circuit.
The display shows the measurement.
If the resistance is <30 Ω, the beeper sounds continuously to indicate continuity. If the display shows OL, the circuit is open.
To disable the beeper, see Power-On Options.
VX terminal.
D.
14
Clamp Meter
Basic Measurements

Capacitance

The Clamp determines capacitance by charging a capacitor with a known current, measuring the resulting voltage, then calculating the capacitance.
Note
A good capacitor stores an electrical charge and may remain energized after power is removed. Before you touch the capacitor or make a measurement, turn all power OFF, use the Clamp to confirm that power is OFF, and carefully discharge the capacitor by connecting a resistor across the leads. Be sure to wear appropriate personal protective equipment.
To test capacitance:
1. Turn the control knob to
2. Push
3. Remove the capacitor from the circuit and discharge the
4. Connect the black test lead to the COM terminal and the red
5. Touch the probes to the capacitor leads.
B to shift to the t function.
capacitor.
test lead to the VX terminal.
The display shows the measurement.
OL indicates the capacitor is faulty or the capacitance value is higher then the measurement range. diSc indicates the capacitor does not properly discharge.
D.

DC Current

To measure dc current:
1. Turn control knob to Y.
The display shows from the jaw. When the current measurement is <0.5 A, the center dot in the icon flashes. For current measurements >0.5 A, the center dot in the icon is steady.
C to indicate that the measurement is

iFlex Probe

XW Warning
To avoid electrical shock, do not apply or remove from live hazardous conductors.
The high-performance AC Flexible Current Probe uses the Rogowski principle for accurate, non-intrusive measurement of sinusoidal, pulsed, and other complex waveforms. The flexible and lightweight measuring head allows quick and easy installation in hard-to-reach areas and works well with large conductors.
To use the iFlex Probe:
1. Connect the iFlex Probe to the Clamp. See Figure 3.
2. Connect the flexible part of the iFlex Probe around the
conductor. If you open the end of the iFlex Probe to make the connection, make sure that you close and latch the coupling. See the detail in Figure 3. You should be able to hear and feel the lock snap into place.
Note
When you measure current, center the conductor in the iFlex Probe. Avoid measurements close to other current-carrying conductors.
15
377/377 FC/378/378 FC
<0.5 A
>0.5 A
1 2 3 4
>2.5 cm
>1 in
Users Manual
3. Keep the probe coupling >2.5 cm (1 inch) away from the conductor.
4. Turn the control knob to
The display shows from the iFlex Probe. When the current measurement is <0.5 A, the center dot in the icon flashes. For current measurements >0.5 A, the center dot is steady.
The display shows the measurement.
K.
J to indicate that the measurements are
Figure 3. iFlex Probe Setup
If the iFlex Probe does not work as expected:
• Make sure that the coupling system is connected and closed correctly or look for any damage. If any foreign material is present, the coupling system will not close properly.
• Inspect the cable between the iFlex Probe and the Clamp for any damage.
• Check that the control knob is in the correct position (
K).
16

Measurement Features

Clamp Meter
Measurement Features
This section is about the Clamp features you can use for measurements.
XW Warning
To prevent possible electrical shock, fire, or personal injury:
• 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 high­voltage capacitors before you measure resistance, continuity, capacitance, or a diode junction.

Display Hold

To capture and hold the display reading, push e. The display freezes and blinks . The Clamp periodically beeps to remind you that the measurement is not live. When in HOLD mode, if the Clamp senses a voltage ±30 V or a voltage overload (OL), on the display to tell you a hazardous voltage is at the Clamp input.
When in HOLD mode, push with live readings.
e again to resume normal operation
Z shows

MIN/MAX/AVG Measurements

Min Max Avg mode captures the minimum, maximum, and average readings of a given output signal over an extended time. The Clamp beeps when it senses a new high value or new low value. This function works in current, voltage, and frequency modes.
Push M to enter the Min/Max/Avg mode. Push M again to toggle between the minimum and maximum readings. Push a third time to display the average reading.
To exit Min Max Avg mode, push and hold
Note
Auto Power Off is always disabled when you use the Min Max Avg function.
M for >2 s.

Inrush Current

Inrush Current is surge current that occurs when an electrical device is first powered on. The Clamp can capture this surge current reading. Current spikes from motor drives are one example of such an event. The Inrush function takes approximately 400 samples over a 100 ms period and calculates the starting current envelope.
To measure inrush current:
1. Select the measurement function (ac current, dc current, or iFlex ac current).
2. Center the Jaw or iFlex Probe around the live wire on the device.
3. Push
I.
Dashes show on the display until the Clamp detects the inrush current. Once the inrush current is detected, the measurement shows on the display.
17
377/377 FC/378/378 FC
Users Manual

Data Logging (377 FC/378 FC)

Fluke Connect™ enables you to log the data measurements. The Fluke Connect app shows measurements from the connected Clamp on your smartphone or tablet display. The app also saves the measurements to Fluke Connect Cloud™ storage and shares the information with your team.
Note
The logging interval is set in the Fluke Connect app. Logging is not available for the inrush and line-to-line measurement modes.
To log measurements:
1. On the Clamp, push
The memory icon indicates how much memory is available.
2. On the Clamp, push
I for >2 s.
I for >2 s to stop logging.

Clear Memory (377 FC/378 FC)

See Power-On Options.

Firmware Update (377 FC/378 FC)

Firmware updates are available for Clamps that have the Fluke Connect™ feature.
To update:
1. ?
2. ?

Firmware Version

To find the firmware version for the Clamp:
1. Turn off the Clamp.
2. Push and hold
The Clamp goes into maintenance mode, turns on all the LCD segments, and turns off the backlight.
3. Push
4. Turn the control knob to OFF to exit the maintenance mode.
e again to show the firmware version number on the
display.
e as you turn the control knob to V.
18
Clamp Meter

Maintenance

Maintenance
The Product does not require routine maintenance.
XW Warning
To prevent possible electrical shock, fire, or personal injury:
• Remove the input signals before you clean the Product.
• Repair the Product before use if the battery leaks. Battery leakage may create a shock hazard or damage the Product.
• Use only specified replacement parts.
• Have an approved technician repair the Product.
• Remove the batteries if the Product is not used for an extended period of time, or if stored in temperatures above 50 °C. If the batteries are not removed, battery leakage may result.

How to Clean the Case

Clean the case with a clean, damp cloth. Do not use abrasives, isopropyl alcohol, or solvents to clean the case or lens/window.

Environmental

This Product has electronic printed circuit boards. These components must be disposed of specifically when the Product is at the end of its use.
The manufacturer offers to take back the Product from the customer to ensure that the Product is disposed of in an environmentally-friendly manner when it is at the end of its use.
See Contact Fluke for more information.

Service

An authorized Fluke Calibration service center should service the Product at two-year intervals to maintain optimum performance.
Contact your equipment distributor or authorized Fluke Calibration Service Center for any equipment performance failure or to schedule regular maintenance service. See Contact Fluke for more information.
Table 6 is a list of replacement parts.
Table 6. Replacement Parts
Item/Description
Battery, AA 1.5 V (x2) 376756
Battery Door Assembly 4696918
Test Lead Set TL75
Flexible Current Probe i2500-10 3676410
Flexible Current Probe i2500-18 3798105
Magnet Strap 669952
Strap (9-inch) 669960
Soft Case 3752958
Fluke Part or
Model Number
19
377/377 FC/378/378 FC
Users Manual
20
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