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(SECOND FUNCTION)..............................................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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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 §
1Jaws 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
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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