Fluke 381, 381-KIT4, 381-NIST User manual

Users Manual

381

Remote Display
True-rms

Clamp Meter

PN 3538357
July 2010
© 2010 Fluke Corporation. All rights reserved. Printed in China. Specifications are subject to

change without notice. All product names are trademarks of their respective companies.

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Table of Contents

Title Page

Introduction................................................................................................................. 1

How to Contact Fluke ................................................................................................. 1

Safety Information ...................................................................................................... 2

Radio Frequency Data ............................................................................................... 7

Features ..................................................................................................................... 8

Remote Display ...................................................................................................... 8

Hazardous Voltage Indicator .................................................................................. 10

Flexible Current Probe ........................................................................................... 10

Auto Power Off ....................................................................................................... 10

Backlight................................................................................................................. 11

Display Hold ........................................................................................................... 11

MIN MAX AVG ....................................................................................................... 11

DC Current Zero..................................................................................................... 11

Inrush ..................................................................................................................... 12

Low Battery Indicators............................................................................................ 12

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Display.................................................................................................................... 17

Measurements............................................................................................................ 19

AC and DC Current (Jaw) ...................................................................................... 19

AC Current (Flexible Current Probe)...................................................................... 22

AC and DC Voltage ................................................................................................ 23

Resistance/Continuity............................................................................................. 26

Inrush Current Measurement (Jaw and Flexible Current Probe) ........................... 26

Frequency Measurement (Jaw and Flexible Current Probe) ................................. 28

Maintenance............................................................................................................... 28

Cleaning the Meter and Flexible Current Probe ..................................................... 28

Battery Replacement.............................................................................................. 29

User-Replaceable Parts ............................................................................................. 31

Specifications ............................................................................................................. 32

Electrical Specifications.......................................................................................... 32

Mechanical Specifications...................................................................................... 37

Environmental Specifications ................................................................................. 38

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Introduction

XWWarning

Read "Safety Information" before you use the Meter.

The Fluke 381 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. This lets the display be easily read
in difficult-measurement situations such as a hazardous environments, or very tight spaces. The
Flexible Current Probe makes it possible to measure higher current (up to 2500 A ac) and larger
cables that traditional jawed meters cannot measure.

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]

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Safety Information

• Examine the test leads for damaged insulation or exposed metal. Check test lead

continuity. Replace damaged test leads before using the Meter.

• Do not use the Meter if it operates incorrectly. Protection can be compromised.

When in doubt, have the Meter serviced.

• Do not use the Meter around explosive gas, vapor or in damp or wet

environments.

• Use only type AAA batteries, properly installed in the Meter case, to power the

Meter.

• To avoid false readings that can lead to electrical shock and injury, replace the

batteries as soon as the low battery indicator (B or Q)
appears.

• When servicing the Meter, use only specified replacement parts. See Table 5.

• Have the Meter serviced only by qualified service personnel.

• Be careful around voltages > 30 V ac rms, 42 V ac peak, or 60 V dc. Such

voltages pose a shock hazard.

• Do not apply more than the rated voltage, as marked on the Meter, between the

terminals or between any terminal and earth ground.

• When using the probes, keep fingers behind the finger guards on the probes.

• Connect the common test lead before connecting the live test lead. When

disconnecting test leads, disconnect the live test lead first.

• Do not work alone so assistance can be rendered in an emergency.

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• Use extreme caution when working around bare conductors or bus bars. Contact

with the conductor could result in electric shock.

• Adhere to local and national safety codes. Individual protective equipment must

be used to prevent shock and arc blast injury where hazardous live conductors
are exposed.

• When measuring, keep fingers behind the Tactile Barrier. See Figure 2.

• Disconnect circuit power and discharge all high-voltage capacitors before you

do diode tests or measure resistance, continuity, or capacitance.

• Do not measure ac/dc current in circuits carrying more than 1000 V or 1000 A

with the Meter Jaw.

• Never operate the Meter with the back cover removed or the case open.

• Do not measure ac current in circuits carrying more than 1000 V or 2500 A with

the Flexible Current Probe.

• Do not apply the Flexible Current Probe around or remove from HAZARDOUS

LIVE conductors.

• Take special care during fitting and removal of the Flexible Current Probe. De-

energize the installation under test or wear suitable protective clothing.

WCaution

To avoid possible damage to the Meter or to equipment under test:

• Use the proper jacks, function, and range for the measurement application.

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Safety Information

Table 1. Symbols

Symbol Meaning Symbol Meaning

B AC (Alternating Current)

F DC (Direct Current)

X Hazardous voltage P

W

B Battery. Low battery when shown.

~

Risk of Danger. Important
information. See Manual.

Do not dispose of this product as unsorted municipal waste. Go to Fluke’s website for
recycling information.

J
P

)

T

Earth ground

AC and dc current.

Conforms to European Union
directives.

Conforms to relevant North American
Safety Standards.

Double insulated

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Symbol Meaning Symbol Meaning

IEC Measurement Category III
CAT III equipment has protection

CAT III

®

-

6

against transients in equipment in
fixed-equipment installations, such
as distribution panels, feeders and
short branch circuits, and lighting
systems in large buildings.

Examined and licensed by TÜV
Product Services.

Do not apply to or remove from
HAZARDOUS LIVE conductors.

The Measurement Category (CAT) and voltage rating of any combination of test probe,
test probe accessory, current clamp accessory, and the Meter is the LOWEST rating of
any individual component.

CAT IV

;

,

Note

IEC Measurement Category IV
CAT IV equipment has protection

against transients from the primary
supply level, such as an electricity
Meter or an overhead or underground
utility service.

Conforms to relevant Australian
standards.

Application around and removal from
HAZARDOUS LIVE conductors is
permitted.

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Remote Display True-rms Clamp Meter

Radio Frequency Data

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.

This device complies with Part 15 of the FCC Rules. Operation is subject to the two conditions
that follow:

1. This device can not cause interference.

2. This device must accept any interference, including interference that can cause undesired
operation of the device.

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.

The Meter was tested and found to comply with the limits for a Class B digital device, pursuant to
Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against
harmful interference in a residential installation. This equipment generates, uses, and can radiate
radio frequency energy and, if not installed and used in accordance with the instructions, can
cause harmful interference to radio communications. However, there is no guarantee that
interference will not occur in a particular installation. If this equipment does cause harmful
interference to radio or television reception, which can be determined by turning the equipment

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Users Manual

off and on, the user is encouraged to try to correct the interference by one or more of the
measures that follow:

• Reorient or relocate the receiving antenna.

• Increase the separation between the equipment and receiver.

• Consult the dealer or an experienced radio/TV technician for help.

The term "IC:" before the radio certification number only signifies the device meets Industry's
Canada technical specifications.

Features

The following sections explain the Meter features in detail. See Figure 2 and Table 2.

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.

The wireless radio signal does not hinder Meter measurements. Usually, the radio signal is off
when the display module is docked to the Meter base. It is possible for the radio signal to be on
when the display module is docked and the Rotary Function Switch is set to OFF. To make sure
that the radio signal is off, remove the batteries from the Meter base and display module.

The display module is synchronized with a Meter base when it is docked on the Meter base and
turned on. Different display modules can be synchronized with a Meter base but, only one display
module can be synchronized to a Meter base at the same time.

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Features

The Meter base and display can be a maximum of 10 meters from each other before the radio
signal connection is broken. This distance can change with the obstacles between the Meter base
and display. There is a radio connection when  shows in the display.

To detach the display from the Meter base, see Figure 1.

1

2

ghn10.eps

Figure 1. Remote Display

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Hazardous Voltage Indicator

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.

Flexible Current Probe

XWWarning

To avoid electrical shock, do not apply or remove from live hazardous
conductors.

The high-performance AC Flexible Current Probe utilizes the Rogowski principle and is used 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.

For more information about the Flexible Current Probe, see “Current Measurement (Flexible
Current Probe)”.

Auto Power Off

The Meter powers off if there is no button push or Rotary Function Switch operation for
20 minutes. If the Meter powers off, turn the Rotary Function Switch OFF and then back on again.
Auto Power Off is disabled during Min Max Avg function use. To disable the Auto Power Off, hold
down  while turning on the Meter.

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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. Push 
again to return to the live reading.

MIN MAX AVG

Min Max Avg mode can capture the minimum, maximum, and average readings of a given output
signal over an extended time.

Push  to enter Min Max Avg mode, push again to toggle between min and max readings.
Push a third time to display the average reading. To exit Min Max Avg mode, push and hold 
for 2 seconds. When Min Max Avg mode is active, the Auto Power Off feature is disabled.

DC Current Zero

Push  to remove any dc offset that could affect the accuracy of dc readings.

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Inrush

Inrush Current is surge current that occurs when an electrical device is first powered on. The
Meter 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.

Low Battery Indicators

The Meter uses two low battery symbols: Band Q. When B
appears, the batteries in the Meter base should be changed. Low batteries on the Meter base will
affect the readings. When Q is displayed, the batteries for the removable display
should be changed. Measurements are not affected by low batteries in the display.

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Features

16

14

3

1

1000 V

CAT

CAT

2

1000 A

600V

iFlex

REMOTE DISPLAY

TRMS CLAMP METER

381

4

ZERO

5 6

7

11

13

10

9

8

12

15

ghn02.eps

Figure 2. Meter Features

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Table 2. Meter Features

Item Description

A Current sensing Jaw
B Tactile Barrier
C Rotary Function Switch, see Table 3.
D Hazardous-voltage indicator
E Display release button
F Display

G

H

I

14

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.

Hold button: freezes the display reading and releases the reading when pushed a
second time.

Min Max button: when first pushed, the Meter shows maximum input. With
subsequent pushes, the minimum and the average inputs are shown. Hold L for
2 seconds to exit min max mode. This function works in current, voltage, and
frequency modes.

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Features

Item Description

J

K

L Jaw release

M

N Common terminal
O Volts/Ohm input terminal
P Flexible Current Probe input terminal

Zero/Shift button: removes dc offset from dc current measurements. Also used to
shift and corresponds to the yellow items on the Rotary Function Switch.

Inrush button: push to enter inrush mode. Push a second time to exit inrush mode.
Integration time is 100 ms.

Alignment marks: to meet accuracy specifications, the conductor must be aligned
with these marks.

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Table 3. Rotary Function Switch

Switch Position Function

OFF Meter is powered down

K AC voltage
L DC voltage

K

A

C DC current

D

16

Resistance and continuity

AC current. Push Z to shift to frequency.

AC current and frequency measurement using the Flexible Current Probe.
Push Z to shift to frequency.

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Features

Display

To view all segments on the display at once, push H while turning the Meter on. See Figure 3
and Table 4.

13

1

15

14

12

11

10

9

2

Figure 3. Display

3

4

5

6

78

ghn01.eps

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Table 4. Display

Item Description Item Description

A Inrush is active H Meter base low-battery symbol

B Hold is active I

C Volts J

D Amps K Continuity
E Ohms, DC, AC, Hz L Hazardous voltage is present.

F Main display M

N

O Min Max mode is active.

18

G

Remote display low-battery
symbol

Measurement is taken at the
Jaw.

RF signal is being sent to
remote display.

Measurement is taken at the
Flexible Current Probe.

Min, Max, or Avg reading is
being shown.

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Measurements

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 avoid electric shock or personal injury:

• When making current measurements, disconnect the test leads from the

Meter.

• Keep fingers behind Tactile Barrier. See Figure 2 and Table 2.

Note

When measuring current, center the conductor in the Jaw using the alignment marks
on the Jaw.

Before taking dc measurements, push Z to ensure correct readings. Zeroing the Meter removes
dc offset from the reading. The Zero function works only in the dc current measurement Rotary
Function Switch position.

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Note

Before zeroing the Meter, make sure the Jaws are closed and there is no conductor
inside the Jaw.

To measure ac or dc current:

1. Turn the Rotary Function Switch to the proper function. You should see X on the display,
indicating that the measurement is coming from the Jaw.

Note

When the measured current is < 0.5 A, the center dot in the display icon X will flash on
and off. With current > 0.5 A, the center dot will be steady.

2. If measuring dc, wait for the display to stabilize and then push Z to zero the Meter.

3. Open the Jaw by pressing the Jaw Release and insert the conductor into the Jaw.

4. Close the Jaw and center the conductor using the alignment marks.

5. View the reading on the display. See Figure 4.

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 4.

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Measurements

CAT
10

0

0V

CAT
60

0

CAT

1000 V

CAT
600V

1000A

Figure 4. Current Measurement with Jaw

V

1000

A

381

REMOTE DIS
TRM

S C

LAMP

P

LAY

M

E

TER

iFlex

ghn04.eps

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AC Current (Flexible Current Probe)

XW Warning

To prevent possible electrical shock or personal injury:

Do not apply the Flexible Current Probe around or remove from HAZARDOUS
LIVE conductors. Take special care during fitting and removal of the Flexible
Current Probe. De-energize the installation under test or wear suitable protective
clothing.

To use the Flexible Current Probe, follow these instructions:

1. Connect the Flexible Current Probe to the Meter. See Figure 5.

2. Connect the flexible part of the Flexible Current Probe around the conductor. If opening the
end of the Flexible Current Probe to make the connection, make sure that you close and
latch it. See the detail in Figure 5. You should be able to hear and feel the Flexible Current
Probe lock snap into place.

Note

When measuring current, center the conductor in the Flexible Current Probe. If possible,
avoid taking measurements close to other current-carrying conductors.

3. Keep the probe coupling more than 2.5 cm (1 inch) away from the conductor.

4. Turn the Rotary Function Switch to
position, Y shows on the display, meaning that the readings are coming from the Flexible
Current Probe.

22

D. When the Rotary Function Switch is in the correct

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Measurements

Note

When the measured current is < 0.5 A, the center dot in the display icon (X) will flash
on and off. With current > 0.5 A, the center dot will be steady.

5. Observe the current value on the Meter display.
If the Flexible Current Probe does not perform as expected:

1. Inspect the coupling system to make sure that it is connected and closed correctly or for any
damage. If any foreign material is present, the coupling system will not close properly.

2. Inspect the cable between the Flexible Current Probe and the Meter for any damage.

3. Check that the Rotary Function Switch of the Meter is in the correct position (

AC and DC Voltage

To measure ac or dc voltage:

1. Turn the Rotary Function Switch to the proper voltage function (V or L).

2. Connect the black test lead to the COM terminal and the red test lead to the G
terminal. See Figure 6.

3. Measure the voltage by touching the probes to the desired test points of the circuit. View the
reading on the display.

D).

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2

24

1

Figure 5. Flexible Current Probe Connection

ghn09.eps

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Measurements

ghn05.eps

Figure 6. Measurement with Test Leads (AC Voltage Shown)

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Resistance/Continuity

To measure resistance or continuity:

1. Turn the Rotary Function Switch to

2. Remove power from the circuit being tested.

3. Connect the black test lead to the COM terminal and the red test lead to the G
terminal.

4. Measure the resistance by touching the probes to the desired test points of the circuit.

5. View the reading on the display.

If the resistance is < 30 Ω, continuity is indicated by a beeper continuously sounding. If the
display reads OL, the circuit is open.

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 A, C, or D if the
Flexible Current Probe is being used for the measurement.

2. Center the Jaw or Flexible Current Probe around the device’s live wire.

3. Push E on the Meter.

4. Turn on the device under test. The inrush current (spike) is displayed on the Meter display.
See Figure 7.

26

K.

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Remote Display True-rms Clamp Meter

REMOTE

D

I

SP

LA

Y

TRMS

C

L

A
MP

ME

T

E

R

381

iFlex

600V

CAT

1000 V

CAT

1000 A

Measurements

Off

CAT

1000 V

CAT
600V

1000 A

REMOTE DISPLAY

381

TRMS CLAMP METER

1

3

On

100 ms

4

INRUSH

2

ghn11.eps

Figure 7. Inrush Current Measurement

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Frequency Measurement (Jaw and Flexible Current Probe)

To measure frequency:

1. Turn the Meter Rotary Function Switch to A or D if the Flexible Current Probe is being
used for the measurement.

2. Center the Jaw or Flexible Current Probe around the measurement source.

3. Push Z on the Meter to shift to Hz. The frequency is displayed on the Meter display.

Maintenance

XW Warning

To avoid 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 avoid electrical shock, remove any input signals before cleaning.

W Caution

To avoid damaging the Meter, do not use aromatic hydrocarbons or chlorinated
solvents for cleaning. These solutions will react with the plastics used in the
Meter. Do not immerse the Meter in water.

Clean the instrument case with a damp cloth and mild detergent.

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Maintenance

Battery Replacement

To replace the batteries in the Meter body, see Figure 8:

1. Turn the Meter OFF.

2. Use a flat head screwdriver to loosen the battery compartment door screw on the Meter
base, and remove the door from the case bottom.

3. Remove the batteries.

4. Replace the batteries with three new AAA batteries.

5. Reattach the battery compartment door to the case bottom and tighten the screw.

To replace the batteries in the display module, see Figure 8:

1. Turn the Meter off.

2. Using the two latches on the side of the Meter, remove the display module.

3. On the bottom of the display module, there is a flat section in the center of the module. With
your thumb, push down and slide the door towards you to open the battery compartment,

4. Remove the batteries.

5. Replace the batteries with two new AAA batteries.

6. Slide the battery door back into place.

7. Dock the Display Module with the Meter base and turn the Meter on.

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Figure 8. Battery Replacement

ghn03.eps

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User-Replaceable Parts

User-Replaceable Parts

Table 5. User-Replaceable Parts

Description Qty. Fluke Part Number

Battery, AAA 1.5 V 5 2838018
Battery Door - Display Module 1 3625529
Battery Door - Meter Base 1 3766406
Fluke 381 Remote Display 1 3766445
Soft Case 1 3752973

User Manual 1 3538357

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Specifications

Electrical Specifications

AC Current Via Jaw

Range .....................................................999.9 A

Resolution...............................................0.1 A

Accuracy ................................................. 2 % ± 5 digits (10-100 Hz)

5 % ± 5 digits (100-500 Hz)

Crest Factor (50/60 Hz) ..........................3 @ 500 A

2.5 @ 600 A

1.42 @1000 A
Add 2 % for C.F. > 2

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Specifications

AC Current via Flexible Current Probe

Range .....................................................999.9 A / 2500 A (45 Hz – 500 Hz)

Resolution ...............................................0.1 A / 1 A

Accuracy .................................................3 % ±5 digits

Crest Factor (50/60Hz) ...........................3.0 at 1100 A

2.5 at 1400 A

1.42 at 2500 A

Add 2 % for C.F. > 2

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Position Sensitivity

34

A

B

C

Figure 9. Position Sensitivity

ghn12.eps

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Specifications

Distance from

Optimum

A 0.5 in (12.7 mm) 1.4 in (35.6 mm) ± 0.5 %
B 0.8 in (20.3 mm) 2.0 in (50.8 mm) ± 1.0 %
C 1.4 in (35.6 mm) 2.5 in (63.5 mm) ± 2.0 %

Measurement uncertainty assumes centralized primary conductor at optimum position, no
external electrical or magnetic field, and within operating temperature range.

i2500-10 Flex i2500-18 Flex Error

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 – 500 Hz)

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DC Voltage

Range .....................................................600.0 V /1000 V

Resolution...............................................0.1 V / 1 V

Accuracy ................................................. 1 % ± 5 digits

Frequency – Via Jaw

Range .....................................................5.0 – 500.0 Hz

Resolution...............................................0.1 Hz

Accuracy ................................................. 0.5 % ± 5 digits

Trigger Level........................................... 5 – 10 Hz, ≥10 A

10 – 100 Hz, ≥5 A
100 – 500 Hz, ≥10 A

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Specifications

Frequency via Flexible Current Probe

Range .....................................................5.0 to 500.0 Hz

Resolution ...............................................0.1 Hz

Accuracy .................................................0.5 % ± 5 digits

Trigger Level ........................................... 5 to 20 Hz, ≥ 25 A

20 to 100 Hz, ≥ 20 A
100 to 500 Hz, ≥ 25 A

Resistance

Range .....................................................600 Ω/6 kΩ/60 kΩ

Resolution ...............................................0.1 Ω/1 Ω/10 Ω

Accuracy .................................................1 % ± 5 digits

Mechanical Specifications

Size (L x W x H) ..................................... 277 mm *88 mm * 43 mm (55 mm for remote unit)

Weight.....................................................350 g

Jaw Opening ...........................................34 mm

Flexible Current Probe Diameter ............7.5 mm

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381

Users Manual

Flexible Current Probe Cable Length

(head to electronics connector) ..............1.8 m

Environmental Specifications

Operating Temperature........................... -10 °C to +50 °C

Storage Temperature.............................. -40 °C to +60 °C

Operating Humidity ................................. Non condensing (< 10 °C)

≤ 90 % RH (at 10 °C to 30 °C)
≤ 75 % RH (at 30 °C to 40 °C)
≤ 45 % RH (at 40 °C to 50 °C)
(Without Condensation)

Operating Altitude ................................... 2000 meters

Storage Altitude ......................................12,000 meters

EMI, RFI, EMC, RF................................. EN 61326-1:2006, EN 61326-2-2:2006

ETSI EN 300 328 V1.7.1:2006
ETSI EN 300 489 V1.8.1:2008

FCC Part 15 Subpart C Sections 15.207, 15.209, 15.249
FCCID: T68-F381

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Remote Display True-rms Clamp Meter

Specifications

RSS-210 IC: 6627A-F381
Temperature Coefficients Add 0.1 x specified accuracy for each degree C above

28 °C or below 18 °C

Wireless Frequency ................................2.4 GHz ISM Band 10 meter range

Safety Compliance..................................ANSI/ISA S82.02.01:2004

CAN/CSA-C22.2 No. 61010-1-04
IEC/EN 61010-1:2001 to 1000V CAT III, 600V CAT IV.

Double Insulation Clearance................... Per IEC 61010-2-032

Double Insulation Creepage ...................Per IEC 61010-1

Agency Approvals ...................................

P, ), ;, ®

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