AEMC 401 User Manual

401

 CLAMP-ON METER

User ManualENGLISH

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CONTENTS

RECEIVING YOUR SHIPMENT...........................................................................7

ORDERING INFORMATION................................................................................ 7

1 PRESENTATION..........................................................................................8

1.1 THEROTARYSWITCH...................................................................................9

1.2 THEFUNCTIONBUTTONS..........................................................................10

1.3 THEDISPLAY................................................................................................11

1.3.1 Display Symbols ...........................................................................11

1.3.2 Measurement Capacity Exceeded (OL)........................................12

1.4 THETERMINALS...........................................................................................12

2 THE BUTTONS........................................................................................... 13

2.1

BUTTON.................................................................................................13

2.2 (YELLOW)BUTTON(SECONDFUNCTION)..............................................14

2.3 BUTTON................................................................................................14

2.4 BUTTON..............................................................................................15

2.4.1 Normal Mode ................................................................................ 15

2.4.2 The MAX/MIN Mode + Activation of the HOLD Mode...................16

2.4.3 Access to the True Inrush™ Mode ( set to )................ 16

2.5 BUTTON................................................................................................17

2.5.1 Normal Mode ................................................................................ 17

2.5.2 The Hz Function + Activation of the HOLD Mode.........................17

3 USE.............................................................................................................18

3.1 INSTALLINGTHEBATTERIES....................................................................18

3.2 TURNINGTHECLAMP-ONMETERON......................................................18

3.3 TURNINGTHECLAMP-ONMETEROFF....................................................18

3.4 CONFIGURATION.........................................................................................19

3.4.1 Configuring the Maximum Resistance for Continuity ....................19

3.4.2 Auto Power OFF ........................................................................... 19

3.4.3 Configuring the Threshold for True InRush™ Measurement.........19

3.4.4 Changing the Default Temperature Unit ....................................... 20

3.4.5 Default Configuration....................................................................21

3.5 VOLTAGEMEASUREMENT(V)...................................................................21

3.6 CONTINUITYTEST .................................................................................22

3.6.1 Lead Resistance Compensation...................................................22

3.7 RESISTANCEMEASUREMENT ..............................................................23

3.8 DIODETEST ............................................................................................23

3.9 CURRENTMEASUREMENT(A)..................................................................24

3.9.1 AC Measurement..........................................................................24

3.10 STARTINGCURRENTOROVERCURRENT(True InRush™)

MEASUREMENT.......................................................................................................25

3.11 FREQUENCYMEASUREMENT(HZ)...........................................................25

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3.11.1 Frequency Measurement (V)........................................................ 25

3.11.2 Frequency Measurement (A)........................................................ 26

3.12 TEMPERATUREMEASUREMENT..............................................................27

3.12.1 Measurement without External Sensor .........................................27

3.12.2 Measurement with External Sensor ..............................................27

4 SPECIFICATIONS......................................................................................28

4.1 REFERENCECONDITIONS.........................................................................28

4.2 SPECIFICATIONSUNDERTHEREFERENCECONDITIONS..................28

4.2.1 DC Voltage Measurement.............................................................28

4.2.2 AC Voltage Measurement............................................................. 29

4.2.3 AC Current Measurement............................................................. 29

4.2.4 True Inrush™ Measurement......................................................... 30

4.2.5 Continuity Measurement...............................................................30

4.2.6 Resistance Measurement .............................................................30

4.2.7 Diode test...................................................................................... 31

4.2.8 Frequency Measurements ............................................................31

4.2.9 Temperature Measurement...........................................................32

4.3 ENVIRONMENTALCONDITIONS...............................................................32

4.4 MECHANICALSPECIFICATIONS...............................................................33

4.5 POWERSUPPLY...........................................................................................33

4.6 COMPLIANCEWITHINTERNATIONALSTANDARDS..............................33

4.7 ENVIRONMENTALVARIATIONS................................................................34

5 MAINTENANCE.......................................................................................... 35

5.1 WARNING ......................................................................................................35

5.2 CLEANING.....................................................................................................35

5.3 REPLACEMENTOFTHEBATTERIES........................................................35

6 REPAIR AND CALIBRATION .................................................................... 36

7 TECHNICAL AND SALES ASSISTANCE.................................................. 36

8 LIMITED WARRANTY................................................................................37

9 WARRANTY REPAIRS ..............................................................................37

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Thank you for purchasing a Model 401 Clamp-on Meter.

For best results from your instrument and for your safety, read the enclosed
operating instructions carefully and comply with the precautions for use. These
products must be only used by qualified and trained users.

Meanings of the symbols used on the device

CAUTION - Risk of Danger!

Indicates a WARNING and that the operator

must refer to the user manual for instructions before operating the instrument

in all cases where this symbol is marked.
Risk of electric shock. The voltage at

the parts marked with this symbol may

be dangerous.

Refers to a type A current sensor. This symbol signifies that application

around and removal from HAZARDOUS LIVE conductors is permitted.

1.5 V battery

The CE marking indicates compliance with European directives

Double insulation or reinforced insulation

In the European Union, this product is subject to a separate collection system

for recycling electrical and electronic components In accordance with directive

WEEE 2002/96/EC
AC – Alternating current
AC and DC – Alternating and direct current
Ground/Earth

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PRECAUTIONS FOR USE

This device complies with safety standards IEC-61010-1 and 61010-2-032 for voltages of
1000V in category IV at an altitude of less than 2000m, indoors, with a degree of pollution
not exceeding 2.
These safety instructions are intended to ensure the safety of persons and proper operation
of the device.

 The operator and/or the responsible authority must carefully read and clearly

understand the various precautions to be taken in use.

 If this instrument is used other than as specified, the protection it provides may be

compromised, thereby endangering you.

 Do not use the instrument in an explosive atmosphere or in the presence of flammable

gases or fumes.

 Do not use the instrument on networks of which the voltage or category exceeds those

mentioned.

 Do not exceed the rated maximum voltages and currents between terminals or with

respect to earth.

 Do not use the instrument if it appears to be damaged, incomplete, or not properly

closed.

 Before each use, check the condition of the insulation on the leads, housing, and

accessories. Any element of which the insulation is deteriorated (even partially) must
be set aside for repair or scrapped.

 Use leads and accessories rated for voltages and categories at least equal to those of

the instrument. If not, an accessory of a lower category lowers the category of the
combined Clamp + accessory to that of the accessory.

 Observe the environmental conditions of use.
 Do not modify the instrument and only use factory replacement parts. Repairs and

adjustments must be done by approved qualified personnel.

 Replace the batteries as soon as the symbol appears on the display of the unit.

Disconnect all leads before opening the battery compartment cover.

 Use personal protective equipment when conditions require.
 Keep your hands away from the unused terminals of the instrument.
 When handling the test probes, alligator clips, and clamp ammeters, keep your fingers

behind the physical guard.

 As a safety measure, and to avoid repeated overloads on the inputs of the device,

configuration operations should only be performed when the device is disconnected
from all dangerous voltages.

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MEASUREMENT CATEGORIES

Definitions of the measurement categories :
CAT II: Circuits directly connected to the low-voltage installation.

Example: power supply to household electrical appliances and portable tools.

CAT III: Power supply circuits in the installation of the building.

Example: distribution panel, circuit-breakers, fixed industrial machines or
devices.

CAT IV: Circuits supplying the low-voltage installation of the building.

Example: power lines, meters, and protection devices.

RECEIVING YOUR SHIPMENT

Upon receiving your shipment, make sure that the contents are consistent with the
packing list. Notify your distributor of any missing items. If the equipment appears
to be damaged, file a claim immediately with the carrier and notify your distributor
at once, giving a detailed description of any damage. Save the damaged packing
container to substantiate your claim.

ORDERING INFORMATION

Clamp-on Meter Model 401.......................................................... Cat. #2139.20

Includes set of 2 color-coded silicone insulated test leads, test probes and alligator clips,
K-thermocouple with 4mm integrated adapter, soft carrying case, 4x1.5V AA batteries and
user manual.

Replacement Parts:

K-thermocouple with 4mm Integrated Adapter................................................Cat. #2139.71

Soft Carrying Case.........................................................................................Cat. #2139.72

Set of 2 Color-coded Silicone Test Leads, Test Probes & Alligator Clips ........Cat. #2152.05

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5

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1 PRESENTATION

The Clamp-on Meter Model 401 is a professional electrical measuring instrument
that combines the following functions:

 Current measurement
 Measurement of True InRush™ current / overcurrent
 Voltage measurement
 Frequency measurement
 Continuity test with buzzer
 Resistance measurement
 Diode test
 Temperature measurement

Item Designation See §

1

Jaws with centering marks

(see connection principles)

3.5 to

3.12
2 Physical Guard ­3 Rotary Function Switch 1.1
4 Function Buttons 2
5 Backlit Display 1.3
6 Input Terminals 1.4
7 Trigger -

Figure 1: Clamp-on Meter Model 401

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1.1 THE ROTARY SWITCH

The rotary switch has five positions. To access the , , , , functions,
set the switch to the desired function. The functions are described in the table
below.

Figure 2: The Function Rotary Switch

Item Function See §

1 OFF mode – Turns the clamp-on meter off 3.3
2 AC, DC voltage measurement (V) 3.5
3 Continuity test

Resistance measurement 
Diode test

3.6

3.7

3.8
4 AC current measurement (A) 3.9
5 Temperature measurement (°C/°F) 3.12

1

2

3

4

5

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1.2 THE FUNCTION BUTTONS

1 2 3

4 5

Figure 3: The Function Buttons

Item Function See §

1 Holds the last value on the display

Lead resistance compensation in the continuity and
ohmmeter functions

2.1

3.6.1

2 Selects the type of measurement and configuration

functions (AC, DC)

2.2

3 Enables/disables display backlighting 2.3
4 Enables/disables the MAX/MIN mode

Enables/disables the True InRush™ mode

2.4

5 Performs Frequency measurements (Hz) 2.5

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1.3 THE DISPLAY

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Figure 4: The Display

Item Function See §

1 Mode selection display 2
2 Display of the measurement value and unit 3.5 to 3.12
3 Display of the MAX/MIN modes 2.4
4 Type of measurement (AC or DC) 2.2
5 Selected resistance measurement display 1.1
6 Low battery indication 5.3
7 Temperature unit display 3.4.4

1.3.1 Display Symbols

Symbol Designation

AC

Alternating current or voltage

DC

Direct current or voltage

Storage of the values and displayhold

Max

Maximum DC or RMS value

Min

Minimum DC or RMS value

V

Volt

Hz

Hertz

A

Ampere

1

2

3

4

6

5

12

°C/°F

Temperature unit Celsius or Fahrenheit



Ohm

m

Milli- prefix

k

Kilo- prefix

Lead resistance compensation

Continuity test

Diode test

Auto Power Off disabled

Low battery indicator

1.3.2 Measurement Capacity Exceeded (OL)

The OL (Over Load) symbol is displayed when the display capacity is exceeded.

1.4 THE TERMINALS

The terminals are used as follows:

1 2

Figure 5: The Terminals

Item Function

1

COM (Black) Input Terminal Jack

2

+ Positive (Red) Input Terminal Jack

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2 THE BUTTONS

The buttons respond differently to short, long, and sustained presses.
In this section, the icon represents the possible positions of the switch for the

button’s functionality.

2.1

BUTTON

This button is used to:

 Store and look up the last values acquired specific to each function (V, A,

, T°) according to the specific modes previously activated (MAX/MIN, Hz).
The present display is then maintained while the detection and acquisition
of new values continues.

 Perform automatic lead resistance compensation (see § 3.6.1).

Successive
presses on

Function

First press: Holds the display of the last value

displayed

Second press: Returns to normal display mode
(the value of each new measurement is
displayed)

long

(> 2 sec)

Performs automatic lead resistance
compensation (see 3.6.1)

See § 2.4.2 and § 2.5.2 for the button functionality in combination with the

and buttons.

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2.2 (YELLOW) BUTTON (SECOND FUNCTION)

This button is used to select the type of measurement (AC, DC) and the second
functions marked in yellow next to the relevant positions of the switch.

It can also be used to modify the default values in the configuration mode
(see § 3.4).

NOTE: This button is invalid in the MAX/MIN and HOLD modes.

Successive

presses on

Function

- Selects AC or DC. Depending on your
choice, the screen displays AC or DC

- Cycles through the continuity ,  and
diode test modes and returns to the
continuity test

- Selects °C or °F as the temperature unit

2.3 BUTTON

Successive

presses on

Function

- Enables/disables the backlighting of the
display

NOTE: The backlighting is automatically disabled at the end of 2 minutes.

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2.4 BUTTON

2.4.1 Normal Mode

This button activates the detection of the MAX and MIN values of the
measurements made. Max and Min are the extreme mean values in DC and the
extreme RMSvaluesin AC.

NOTE: In this mode, the Auto Power Off function of the device is automatically

disabled. The symbol is displayed on the screen.

Successive presses on

Function

short

First press: Activates detection of the

MAX/MIN values
Second press: Displays the MAX or MIN

value successively
Third press: Returns to the display of the

present measurement without exiting from
the mode (the values already detected are
not erased)

NOTE: The MAX and MIN symbols are
both displayed, but only the symbol of the
measurement selected blinks.

Example: If MIN has been selected, MIN
blinks and MAX is litsteadily.

long (> 2 sec)

- Exits the MAX/MIN mode. The values
previously recorded are then erased.

NOTE: If the HOLD function is activated, it
is not possible to exit from the MAX/MIN
mode. The HOLD function must first be
disabled.

NOTE : ΔREL function can be used with the functions of the MAX/MIN mode.

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2.4.2 The MAX/MIN Mode + Activation of the HOLD Mode

Successive presses on

Function

short

- Displays the MAX/MIN values detected
before the button was pressed.

- When the button is pressed, thelast
value is held on the display.

NOTE: The HOLD function does not interrupt the acquisition of new MAX, MIN values

2.4.3 Access to the True Inrush™ Mode ( set switch to )

This button allows measurement of the True Inrush™ current (starting current, or
overcurrent in steady-state operation).

Successive presses on

Function

long (>2 sec)

- First press: Enters the True InRush™
mode

- "Inrh" is displayed for 3s (the
backlighting blinks)

- The triggering threshold is displayed for
5s (the backlighting is steady)

- "------" is displayed and the "A" symbol
flashes (backlighting turns off)

- After detection and acquisition, the
InRush current measurement is
displayed, after the calculations stage "--

----" (backlighting off)

NOTE: The A symbol flashes to indicate

"surveillance" of the signal.

- Second press: Exits the True InRush™
mode (return to simple current
measurement)

short (<2 sec)

Note: A short press

is functional only if a True

InRush value has been

detected.

- Displays the PEAK+ value of thecurrent

- Displays the PEAK- value of the current

- Displays the RMS True InRush™
current

NOTE: The A, AC and PEAK values flash

during this sequence.

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2.5 BUTTON

This button is used to display the frequency measurements of a signal.

NOTE: This button is not functional in the DC mode.

2.5.1 Normal Mode

Successive

presses on

Function

Displays:

- The frequency of the signal measured

- The present voltage (V) or current (A)
measurement

2.5.2 The Hz Function + Activation of the HOLD Mode

Successive

presses on

Function

- Holds the last frequency reading

- Successively displays the last held frequency,
then the voltage or the current

- NOTE: Pressing the button a second
time returns to realtime measurement
updates.

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3 USE

3.1 INSTALLING THE BATTERIES

Insert the batteries supplied with the device as follows:

1. Using a screwdriver, unscrew the battery compartment cover (item 1)
from the back of the housing.

2. Insert the 4x1.5V AA batteries supplied (item 2), observing polarities.

3. Close the battery compartment cover and screw it onto the housing.

Figure 6 : The Battery Compartment

3.2 TURNING THE CLAMP-ON METER ON

 With the rotary switch set in the OFF position, turn the switch to the

desired function. The display lights (all symbols) for a few seconds (see

§1.3), then the screen of the function chosen is displayed.

 The clamp-on meter is now ready to make measurements.

3.3 TURNING THE CLAMP-ON METER OFF

The clamp-on meter can be turned off in two ways:

 Manually - Turn the switch to the OFF position.
 Automatically - After ten minutes with no activity, the instrument will turn

OFF. Thirty (30) seconds before the device is switched off, an audible
signal sounds intermittently. To re-activate the device, press any button
or turn the rotary switch.

1

2

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3.4 CONFIGURATION

As a safety measure, and to avoid repeated overloads on the inputs of the
device, configuration operations should only be performed when the device is
disconnected from all dangerous voltages.

3.4.1 Configuring the Maximum Resistance for Continuity

To configure the maximum resistance allowed for a continuity:

1. With the switch in the OFF position, hold the (yellow) button down
while turning the switch to until the "full screen" display ends and a
beep is emitted. The display will indicate the value below which the
buzzer is activated and the symbol is displayed. The value stored by
default is 40. The possible values range between 1 and 999.

2. To change the threshold, press the (yellow) button. The right-hand
digit flashes; each press on the (yellow) button increments it. To
shift to the next digit, apply a long press (>2s) to the (yellow)
button.

When the desired value is displayed, turn the switch to another setting. The
detection threshold chosen is stored and a double beep is emitted.

3.4.2 Auto Power OFF

The Auto Power OFF feature is enabled by default. To disable it, perform the
following:

1. In the OFF position, hold the button down while turning the switch
to until the "full screen" display ends and a beep is emitted. The
symbol is displayed.

2. When the button is released, the device is in the voltmeter function
in the normal mode.

3. To return to Auto Power OFF, turn the clamp-on meter OFF and then
back ON again.

3.4.3 Configuring the Current Threshold for True InRush™
Measurement

To configure the triggering current threshold of the True InRush™ measurement:

1. In the OFF position, hold the button down while turning the switch
to until the "full screen" display ends and a beep is emitted. The
display will indicate the percentage overshoot to apply to the measured
current to determine the measurement triggering threshold.

The value stored by default is 10%, representing 110% of the
established current measured. The possible values are 5%, 10%, 20%,
50%, 70%, 100%, 150%, and 200%.

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2. To change the threshold, press the (yellow) button. The value
flashes; each press on the (yellow) button displays the next value.
To record the chosen threshold, apply a long press (>2s) on the

(yellow) button. A confirmation beep is emitted.

When the desired value is displayed, turn the switch to another setting. The
chosen threshold is stored and a double beep is emitted.

NOTE: The starting (InRush) current measurement triggering threshold is fixed at
1% of the least sensitive range. This value is 1% of 99.99A or 1A. This threshold
is not adjustable.

3.4.4 Changing the Default Temperature Unit

To program the measurement unit, °C or °F:

1. In the OFF position, hold the (yellow) button down while turning

the switch to until the "full screen" display ends and a beep is
emitted. The display will indicate the currently assigned unit (°C or °F).
The default unit is °C.

2. Pressing the (yellow) button toggles between °C and °F.

When the desired unit is displayed, turn the switch to another setting. The unit
chosen is stored and a double beep is emitted.

NOTE: Pressing the (yellow) button during an active temperature
measurement will toggle between °C and °F.

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3.4.5 Default Configuration

To reset the clamp-on meter to its default parameters (factory configuration):

1. In the OFF position, hold the (yellow) button down while turning the
switch to

,

until the "full screen" display ends and a beep is emitted.

The "rSt" symbol is displayed.

2. After 2 s, the clamp-on meter emits a double beep, then all of the digital
symbols of the screen are displayed until the (yellow) button is
released. The default parameters are then restored:

 Continuity detection threshold = 40
 True InRush triggering threshold = 10%
 Temperature measurement unit = °C
 Adapter function scale factor = 10

3.5 VOLTAGE MEASUREMENT (V)

To measure voltage, proceed as follows:

1. Set the switch to .

2. Connect the black lead to the COM terminal and the red lead to the "+"
terminal.

3. Connect the test probes or the alligator clips to the circuit to be
measured. The device selects AC or DC automatically according to
which measured value is larger. The AC or DC symbol displays blinking
in auto detect mode.

To select AC or DC manually, press the (yellow) button to toggle between
them. The symbol corresponding to the choice will then display.

The measured value is displayed on the screen.

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3.6 CONTINUITY TEST

Warning: Before performing the test, make sure that the circuit is off and all
capacitors have been discharged.

1. Set the switch to ; the symbol is displayed.

2. Connect the black lead to the COM terminal and the red lead to the "+"
terminal.

3. Connect the test probes or the alligator clips to the circuit or component
to be measured.

An audible signal is emitted if there is continuity (resistance value is below the
maximum threshold, see § 3.4.1) and the measured value is displayed on the
screen.

3.6.1 Lead Resistance Compensation

Warning: Before the compensation is executed, the MAX/MIN and HOLD modes
must be de-activated.

To perform automatic compensation of the test lead resistance, proceed as
follows:

1. Short-circuit the leads connected to the meter.

2. Hold the button down until the display unit indicates the lowest
value. The device measures the resistance of the leads.

3. Release the button. The correction and the symbol are
displayed. The value displayed is stored.

NOTE: The correction value is stored only if it is  2.

Above 2, the value displayed blinks and is not stored.

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3.7 RESISTANCE MEASUREMENT 

Warning: Before making a resistance measurement, make sure that the circuit is
off and all capacitors have been discharged.

1. Set the switch to and press the (yellow) button. The  symbol
is displayed.

2. Connect the black lead to the COM terminal and the red lead to the "+"
terminal.

3. Connect the test probes or the alligator clips to the circuit or component
to be measured.

The measured value is displayed on the screen.
NOTE: To measure low resistance values, first perform lead resistance

compensation (see § 3.6.1).

3.8 DIODE TEST

Warning: Before performing the diode test, make sure that the circuit is off and
all capacitors have been discharged.

1. Set the switch to and press the (yellow) button twice. The
symbol is displayed.

2. Connect the black lead to the COM terminal and the red lead to the "+"
terminal.

3. Connect the test probes or the alligator clips to the component to be
tested.

24

The measured value is displayed on the screen.

4. Reverse the leads on the diode and repeat the test.

3.9 CURRENT MEASUREMENT (A)

The jaws are opened by pressing the trigger on the body of the meter. The arrow
on the jaws of the clamp-on meter (see the diagram below) should point in the
presumed direction of current flow, from the generator to the load. Make sure that
the jaws have closed correctly after clamping around the conductor.

NOTE: The measurement results are optimal when the conductor is centered in
the jaws (aligned with the centering marks).

The device selects AC or DC automatically according to which measured value is
larger. The AC or DC symbol displays blinking in auto detect mode.

NOTE: The Model 401 does not measure DC current.

3.9.1 AC Measurement

For an AC current measurement, proceed as follows:

1. Set the switch to .

2. Clamp the jaws around the conductor to be measured.

The measured value is displayed on the screen.

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3.10 STARTING CURRENT OR OVERCURRENT (True Inrush™)
MEASUREMENT

To measure a starting current or overcurrent, proceed as follows:

1. Set the switch to , then clamp the jaws around the conductor to be
measured. Press the (yellow) button to select AC measurement.

2. Perform a long press on the button. The InRh symbol is
displayed, along with the triggering threshold. The clamp then awaits
detection of the True InRush™ current. "------" is displayed and the A
symbol flashes.

3. After detection and acquisition for 100 ms, the RMS value of the True­Inrush™ current is displayed. Pressing the button will display the

PEAK+/PEAK- values subsequently.

4. A long press on the button or a change of function on the rotary
switch will exit the True InRush™ mode.

NOTE: The triggering threshold in A is 10A if the initial current is zero (starting of
installation). For an established current (overload in an installation) see §3.4.3.

3.11 FREQUENCY MEASUREMENT (HZ)

The frequency measurement is available in V and A for AC measurements. The
measurement is based on a count of zero crossings (positive-going edges).

3.11.1 Frequency Measurement (V)

To measure the frequency in voltage, proceed as follows:

1. Setthe switchto andpress the button. TheHzsymbolis displayed.

2. Select AC by pressing the (yellow) button until the desired choice
is reached.

3. Connect the black lead to the COM terminal and the red lead to the "+"
terminal.

4. Connect the test probes or the alligator clips to the circuit to be
measured.

26

The measured value is displayed on the screen.

3.11.2 Frequency Measurement (A)

1. Set the switch to and press the button. The Hz symbol is
displayed.

2. Clamp the jaws around the conductor to be measured.

The measured value is displayed on the screen.

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3.12 TEMPERATURE MEASUREMENT

3.12.1 Measurement without External Sensor

1. Set the switch to .

The temperature (blinking) displayed is the internal temperature of the device. It
will be equal to the ambient temperature after a sufficiently long thermal
stabilization time (at least one hour).

3.12.2 Measurement with External Sensor

The device measures the temperature using a K-thermocouple.

1. Connect the K-thermocouple to the COM and “+” input terminals of the
device observing the red and black banana plug polarity.

2. Set the switch to .

3. Place the K-thermocouple on the element or environment to be
measured. It must not be at a dangerous voltage.

The temperature will be displayed on the screen.
To change the unit to either °F or °C, press the (yellow) button.

NOTE:

- If the external sensor is defective, the temperature displayed blinks.

- If there are large variations of the initial temperature environment of the
meter and the measurement environment, the measurement must be
preceded by a stabilization time.

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4 SPECIFICATIONS

4.1 REFERENCE CONDITIONS

Quantities of Influence Reference Conditions

Temperature: 23°C ±2°C
Relative humidity: 45% to 75%
Supply voltage: 6.0V ±0.5V
Frequency range of the applied signal: 45 to 65Hz
Sine wave: pure

Peak factor of the applied alternating signal: √2

Position of the conductor in the clamp: centered
Adjacent conductors: none
Alternating magnetic field: none
Electric field: none

4.2 SPECIFICATIONS UNDER THE REFERENCE CONDITIONS

Accuracy is expressed in ± (x% of the reading (R) + y counts (ct)).

4.2.1 DC Voltage Measurement

Measurement range 0.00 to 99.99V 100.0 to 999.9V 1000V (1)
Specified

measurement range

0 to 100% of the measurement range

Accuracy

0.00 to 9.99V

±(1% R + 10cts)

10.00 to 99.99V
±(1% R +3cts)

±(1% R +3cts)

Resolution 0.01V 0.1V 1V
Input impedance

10M

Note (1) Above 1000V, a repetitive beep indicates that the voltage being

measured is greater than the safety voltage for which the device is
guaranteed. The display indicates "OL".

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4.2.2 AC Voltage Measurement

Measurement
range

0.15 to 99.99V 100.0 to 999.9V

1000V RMS

1400V peak (1)

Specified
measurement
range (2)

0 to 100% of the measurement range

Accuracy

0.15V to 9.99V

± (1% R + 10cts)

10.00 to 99.99V
± (1% R +3cts)

± (1% R +3cts)

Resolution 0.01V 0.1V 1V
Input impedance

10M

Note (1) Above 1000V (RMS), a repetitive beep indicates that the voltage

being measured is greater than the safety voltage for which the
device is guaranteed. The display indicates "OL".

Note (2) Any value between zero and the min. threshold of the measurement

range (0.15V) is forced to "----" on the display.

Specific Specifications in MAX/MIN mode (from 10Hz to 1kHz, and from

0.30V in AC):

 Accuracy: add 1% R to the values of the table above.
 Capture of the extreme: approximately 100ms.

4.2.3 AC Current Measurement

Measurement
range

0.15 to 99.99A 100.0 to 999.9A 1000A (1)

Specified
measurement
range (2)

0 to 100% of the measurement range

Accuracy ± (1% R + 10cts) ± (1% R +3cts) ± (1.5% R +3cts)
Resolution 0.01A 0.1A 1A

Note (1) - The display indicates “OL” above 1000A.
Note (2) Any value between zero and the min. threshold of the measurement

range (0.15A) is forced to show “----“ on the display.
Residual current at zero <150mA.

Specific Specifications in MAX/MIN mode (from 10Hz to 1kHz, and from

0.30A in AC):

 Accuracy (with zero corrected): add 1% R to the values of the table

above.

 Capture of the extreme: approximately 100ms.

30

4.2.4 True Inrush™ Measurement

Measurement range 10 to 1000AAC
Specified measurement range 0 to 100% of the measurement range
Accuracy ± (5% R + 5cts)
Resolution 1A

Specific Specifications in PEAK mode in True InRush (from 10Hz to 1kHz):

 Accuracy: add ± (1.5% R +0.5A) to the values in the tables above.
 PEAK capture time: 1ms min. to 1.5ms max.

4.2.5 Continuity Measurement

Measurement range

0.0 to 999.9

Open-circuit voltage

 8V
Measurement current 550µA
Accuracy ± (1% R +3cts)
Buzzer triggering threshold

Adjustable from 1 to 999 (40 is the default)

4.2.6 Resistance Measurement

Measurement range (1)

0.0 to 999.9

1000 to

9999

10.00 to

99.99k

Specified measurement
range

1 to 100% of the

measurement range

0 to 100% of the

measurement range
Accuracy ± (1% R +3cts)
Resolution

0.1 1 10

Open-circuit voltage

 8V

Measurement current 550µA 100µA 10µA

Note (1) Above the maximum display value, the display unit indicates "OL".

The "-" and "+" signs are not displayed.

Specific Specifications in MAX/MIN mode:

 Accuracy: add 1% R to the values of the table above.
 Capture of the extreme: approximately 100ms.

31

4.2.7 Diode test

Measurement range 0.000 to 3.199VDC
Specified measurement range 1 to 100% of the measurement range
Accuracy ± (1% R + 3cts)
Resolution 0.001V
Measurement current 0.55mA
Indication: junction reversed or

open-circuit

"OL" is displayed when the measured

voltage >3.199V



Note : The "-" sign is disabled for the diode test function.

4.2.8 Frequency Measurements

4.2.8.1 Voltage

Measurement range (1) 5.0 to 999.9Hz 1000 to 9999Hz 10 to 19.99kHz
Specified measurement

range

1 to 100% of the

measurement

range

0 to 100% of the

measurement range

Accuracy ± (0.4% R + 1ct)
Resolution 0.1Hz 1Hz 10Hz

4.2.8.2 Current

Measurement range (1) 5.0 to 1999Hz
Specified measurement range 1 to 100% of the measurement range
Accuracy ± (0.4% R + 1ct)
Resolution 0.1Hz

Note (1) In MAX/MIN mode, the operating range is limited to 1kHz.

If the level of the signal is too low (<10% of the range, or V<10V or
I<10A) or if the frequency is less than 5Hz, the device cannot
determine the frequency and displays "----".

Specific Specifications in MAX/MIN mode (from 10Hz to 1kHz):

 Accuracy: add 1% R to the values of the table above.
 Capture of the extreme: approximately 100ms.

32

4.2.9 Temperature Measurement

Function External temperature

Type of sensor K-thermocouple
Measurement range -60.0°C to +999.9°C

-76.0°F to +1831.8°F

+1000°C to +1200°C

+1832°F to +2192°F

Specified measurement
range

1 to 100% of the

measurement range

0 to 100% of the

measurement range

Accuracy (1) 1% R ±3°C

1% R ±5.4°F

1% R ±3°C

1% R ±5.4°F

Resolution 0.1°C

0.1°F

1°C
1°F

Note (1) The stated external temperature measurement accuracy does not take

the accuracy of the K-thermocouple into account.

Note 2 Use of the thermal time constant (0.7min/°C):

If there is a sudden variation of the temperature of the clamp, by 10°C
for example, the clamp will be at 99% (cnst = 5) of the final
temperature after 0.7min/°Cx10°Cx5 = 35 min (the time constant of the
external sensor must be added to this value).

Specific Specifications in MAX/MIN mode (10Hz to 1kHz):

 Accuracy: add 1% R to the values of the table above.
 Capture of the extreme: approximately 100ms.

4.3 ENVIRONMENTAL CONDITIONS

Conditions Operating Storage

Temperature -4° to +131°F

(-20° to +55°C)

-40° to +158°F

(-40° to +70°C)

Relative humidity (RH): ≤90% up to 131°F (55°C) ≤90% up to 158°F (70°C)

33

4.4 MECHANICAL SPECIFICATIONS

Housing:

Rigid polycarbonate shell with over-molded elastomer

covering; UL94 V1

Jaws:

Polycarbonate
Opening: 1.9" (48mm)
Clamping diameter: 1.9" (48mm)

Screen:

LCD display unit
Blue backlighting
Dimension: 1.6 x 1.9" (41 x 48mm)

Dimension: 10.7 x 3.6 x 1.6" (272 x 92 x 41mm)
Weight: 1.32 lbs (600g) with the batteries

4.5 POWER SUPPLY

Batteries: 4x1.5V AA LR6
Battery life: >350 hours (without backlighting)
Auto Power Off After 10 minutes with no switch and/or button

activity

4.6 COMPLIANCE WITH INTERNATIONAL STANDARDS

Electric safety:

Compliant with standards IEC-61010-1,
IEC-61010-2-30, and IEC-61010-2-32:
1000V CAT IV.

Electromagnetic
compatibility:

Compliant with standard EN-61326-1
Classification: residential environment

Mechanical
strength:

Free fall: 2m (in accordance with standard IEC-68-2-32)

Level of protection
of the housing:

Housing: IP54 (per standard IEC-60529)

Jaws: IP40

34

4.7 ENVIRONMENTAL VARIATIONS

Condition of

Influence

Range of
Influence

Measurement

Influenced

Influence

Typical MAX

Temperature

-4° to +131°F

(-20° to +55°C)

VAC
VDC

A

T°C



Hz

-

0.1% R/10°C
1% R/10°C

(0.2% R +1°C)/10°C

0.1% R/10°C + 2ct

0.1% R/10°C

0.5% R/10°C + 2ct

1.5% R/10°C + 2ct

(0.3% R +2°C)/10°C

0.1% R/10°C + 3ct

Humidity 10 to 90% RH

V
A

0.1% R 0.1% R + 1ct

Frequency

10Hz to 1kHz
1kHz to 3kHz

10Hz to 400Hz

400Hz to 2kHz

V
A

1% R
8% R
1% R
4% R

1% R + 1ct
9% R + 1ct
1% R + 1ct
5% R + 1ct

Position of

the conductor

in the

jaws

(f400Hz)

Any position

on the internal

perimeter of

the jaws

A 2% R 4% R + 1ct

Adjacent
conductor
carrying a

current of

150ADC or

RMS

Conductor

touching the

external

perimeter of

the jaws

A 40 dB 45 dB

Conductor

enclosed by

the clamp

0 to 500ARMS V

 1ct

1ct

Application of

a voltage on

the clamp

0 to 1000VDC

or RMS

A

 1ct

3% R + 1ct

Peak factor

1.4 to 3.5,
limited

to 1500A peak

1400V peak

A (AC)
V (AC)

1% R
1% R

3% R + 1ct

35

5 MAINTENANCE

5.1 WARNING

 Remove the test leads on any input before opening the case.
 Do not operate the clamp-on meter without a battery case cover.
 To avoid electrical shock, do not attempt to perform any servicing

unless you are qualified to do so.

 To avoid electrical shock and/or damage to the instrument, do not get

water or other foreign agents into the probe.

5.2 CLEANING



Disconnect everything connected to the device and set the switch to
OFF.



Use a soft cloth moistened with soapy water. Rinse with a damp cloth
and dry quickly using a dry cloth or forced air.



Dry completely before putting back into use.

5.3 REPLACEMENT OF THE BATTERIES

The symbol indicates that the batteries are low. When this symbol appears
on the display unit, the batteries must be replaced. The measurements and
specifications are no longer guaranteed.

To replace the batteries, proceed as follows:

1. Disconnect the measurement leads from the input terminals.

2. Set the switch to OFF.

3. Using a screwdriver, unscrew the battery compartment cover from the
back of the housing.

4. Remove the used batteries and replace them with 4x1.5V AA batteries,
observing the polarities.

5. Close the battery compartment cover and screw it onto the housing.

36

6 REPAIR AND CALIBRATION

To ensure that your instrument meets factory specifications, we recommend
that it be submitted to our factory Service Center at one-year intervals for
recalibration, or as required by other standards or internal procedures.

For instrument repair and calibration:

You must contact our Service Center for a Customer Service Authorization
number (CSA#). This will ensure that when your instrument arrives, it will be
tracked and processed promptly. Please write the CSA# on the outside of
the shipping container. If the instrument is returned for calibration, we need
to know if you want a standard calibration, or a calibration traceable to
N.I.S.T. (includes calibration certificate plus recorded calibration data).

Chauvin Arnoux®, Inc. d.b.a. AEMC®Instruments

15 Faraday Drive
Dover, NH 03820 USA

Tel: [phone] (Ext. 360)

[phone] (Ext. 360)

Fax: [phone] or [phone]

[e-mail]
(Or contact your authorized distributor)
Costs for repair, standard calibration, and calibration traceable to N.I.S.T. are

available.

NOTE: All customers must obtain a CSA# before returning any
instrument.

7 TECHNICAL AND SALES ASSISTANCE

If you are experiencing any technical problems, or require any assistance
with the proper operation or application of your instrument, please call, mail,
fax or e-mail our technical support hotline:

Chauvin Arnoux®, Inc. d.b.a. AEMC®Instruments
200 Foxborough Boulevard
Foxborough, MA 02035, USA

Phone: [phone]

[phone]

Fax: [phone]

[e-mail]

www.aemc.com

NOTE: Do not ship instruments to our Foxborough, MA address.

37

8 LIMITED WARRANTY

The Model 401 is warranted to the owner for a period of three years from
the date of original purchase against defects in manufacture. This limited
warranty is given by AEMC®Instruments, not by the distributor from
whom it was purchased. This warranty is void if the unit has been
tampered with, abused or if the defect is related to service not performed
by AEMC®Instruments.

Full warranty coverage and product registration is available on our
website at www.aemc.com/warranty.html.

Please print the online Warranty Coverage Information for your
records.

If a malfunction occurs within the three-year period, you may return the
instrument to us for repair, provided we have your warranty registration
information on file or a proof of purchase. AEMC®Instruments will, at its
option, repair or replace the faulty material.

REGISTER ONLINE AT: www.aemc.com

9 WARRANTY REPAIRS

What you must do to return an Instrument for Warranty Repair:

First, request a Customer Service Authorization Number (CSA#) by
phone or by fax from our Service Department (see address below), then
return the instrument along with the signed CSA Form. Please write the
CSA# on the outside of the shipping container. Return the instrument,
postage or shipment pre-paid to:

Chauvin Arnoux®, Inc. d.b.a. AEMC®Instruments
15 Faraday Drive • Dover, NH 03820 USA

Tel: [phone] (Ext. 360)

[phone] (Ext. 360)

Fax: [phone] or [phone]
[e-mail]

Caution: To protect yourself against in-transit loss, we recommend you
insure your returned material.

NOTE: All customers must obtain a CSA# before returning any
instrument.

38

NOTES:

Chauvin Arnoux®, Inc. d.b.a AEMC®Instruments

15 Faraday Drive • Dover, NH 03820 USA

www.aemc.com

99-MAN 100364 v1 05/12