AEMC AEMC 203 Manual

 CLAMP-ON METER

99 Washington Street
Melrose, MA 02176

Phone [phone]
Toll Free 1-800-517-8431

Visit us at www.TestEquipmentDepot.com

203

ENGLISH

User Manual

Statement of Compliance

Chauvin Arnoux®, Inc. d.b.a. AEMC® Instruments
certifi es that this instrument has been calibrated
using standards and instruments traceable to
international standards.

We guarantee that at the time of shipping your
instrument has met its published specifi cations.

An NIST traceable certifi cate may be
requested at the time of purchase, or obtained
by returning the instrument to our repair and
calibration facility, for a nominal charge.

The recommended calibration interval for this
instrument is 12 months and begins on the date of
receipt by the customer.

Serial #: ________________________________

Catalog #: ______________________________

Model #: ______________________________

Please fi ll in the appropriate date as indicated:

Date Received: _________________________________

Date Calibration Due:

_______________________

CONTENTS

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

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

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

1.1 ROTARY SWITCH ......................................................................................... 9

1.2 FUNCTION BUTTONS ................................................................................ 10

1.3 DISPLAY ...................................................................................................... 11

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

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

1.4 TERMINALS................................................................................................. 12

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

2.1

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 switch to ) ........ 16

2.5

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

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

2.6 BUTTON ........................................................................................... 18

3 USE ............................................................................................................. 19

3.1 INSTALLING THE BATTERY ...................................................................... 19

3.2 TURNING THE CLAMP-ON METER ON .................................................... 19

3.3 TURNING THE CLAMP-ON METER OFF .................................................. 19

3.4 CONFIGURATION ....................................................................................... 20

3.4.1 Configuring the Maximum Resistance for Continuity .................... 20

3.4.2 Auto Power OFF ........................................................................... 20

3.4.3 Configuring the Current Threshold for True InRush® Measurement20

3.4.4 Changing the Default Temperature Unit ....................................... 21

3.4.5 Configuring the Adapter Function Scale Factor ............................ 21

3.4.6 Default Configuration .................................................................... 22

3.5 VOLTAGE MEASUREMENT (V) ................................................................. 22

3.6 CONTINUITY TEST ............................................................................... 23

3.6.1 Lead Resistance Compensation ................................................... 23

3.7 RESISTANCE MEASUREMENT ................................................................ 24

3.8 DIODE TEST ......................................................................................... 24

3.9 CURRENT MEASUREMENT (A) ................................................................ 25

3.9.1 AC Measurement .......................................................................... 25

3.9.2 DC Measurement .......................................................................... 26

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

BUTTON ............................................................................................. 17

3

STARTING CURRENT OR OVERCURRENT (TRUE INRUSH

3.10

®

)

MEASUREMENT .................................................................................................... 27

3.11 FREQUENCY MEASUREMENT (HZ) ......................................................... 27

3.11.1 Frequency Measurement (V) ........................................................ 27

3.11.2 Frequency Measurement (A) ........................................................ 28

3.12 TEMPERATURE MEASUREMENT ............................................................ 29

3.12.1 Measurement without External Sensor ......................................... 29

3.12.2 Measurement with External Sensor .............................................. 29

3.13 ADAPTER FUNCTION MEASUREMENT ................................................... 30

4 SPECIFICATIONS ...................................................................................... 31

4.1 REFERENCE CONDITIONS ....................................................................... 31

4.2 SPECIFICATIONS UNDER THE REFERENCE CONDITIONS ................. 31

4.2.1 DC Voltage Measurement ............................................................. 31

4.2.2 AC Voltage Measurement ............................................................. 32

4.2.3 DC Current Measurement ............................................................. 32

4.2.4 AC Current Measurement ............................................................. 33

4.2.5 True Inrush® Measurement ........................................................... 33

4.2.6 Continuity Measurement ............................................................... 33

4.2.7 Resistance Measurement ............................................................. 34

4.2.8 Diode test ...................................................................................... 34

4.2.9 Frequency Measurements ............................................................ 34

4.2.10 Temperature Measurement ........................................................... 35

4.2.11 Adapter Function Measurement .................................................... 36

4.3 ENVIRONMENTAL CONDITIONS .............................................................. 37

4.4 MECHANICAL SPECIFICATIONS .............................................................. 37

4.5 POWER SUPPLY ........................................................................................ 37

4.6 COMPLIANCE WITH INTERNATIONAL STANDARDS ............................. 37

4.7 ENVIRONMENTAL VARIATIONS ............................................................... 38

5 MAINTENANCE .......................................................................................... 39

5.1 WARNING .................................................................................................... 39

5.2 CLEANING ................................................................................................... 39

5.3 REPLACEMENT OF THE BATTERY ........................................................... 39

8 LIMITED WARRANTY ................................................................................ 41

9 WARRANTY REPAIRS .............................................................................. 41

4

Thank you for purchasing a Model 203 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.

9V 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

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.

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 203 ............................................................ Cat. #2139.12

Includes set of 2, 5 ft. (1.5m) needle tip color-coded leads with 4mm right angle

plug, K-thermocouple with 4mm integrated adapter,soft carrying case, 1x9V

battery and user manual.

Replacement Parts:

Soft Carrying Case ........................................................................... Cat. #2118.65

K-thermocouple with 4mm integrated adapter .................................. Cat. #2139.71

Set of 2, 5 ft. (1.5m) Needle Tip Color-coded (Rd/Bk) Leads w/4mm
Right-angle Plug

(600V CAT IV w/shield on Needle Tip, 1000V CAT II w/o shield) ..... Cat. #2154.74

Accessories:

Set of 2, Color-coded (Rd/Bk) Leads, Test Probes & Alligator .......... Cat #2152.05

1 PRESENTATION

The Clamp-on Meter Model 203 is a professional electrical measuring instrument
that combines the following functions:

 Current measurement
 Measurement of InRush current / overcurrent (True InRush
 Voltage measurement
 Frequency measurement
 Continuity test with buzzer
 Resistance measurement
 Diode test
 Temperature measurement
 Adapter function (for use with external transducers/measurement

devices)

®

)

1

2

7

3

4

5

6

Item Designation See §

Jaws with centering marks

1

(see connection principles)

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 -

3.5 to

3.12

Figure 1: Clamp-on Meter Model 203

1.1 ROTARY SWITCH

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

1

2

3

4

5

6

Figure 2: Function Rotary Switch

Item Function See §

1 Adapter function 3.13

2 Temperature measurement (°C/°F) 3.12

3 AC, DC current measurement (A) 3.9

4 Continuity test

Resistance measurement 
Diode test

5 AC, DC voltage measurement (V) 3.5

6 OFF mode – Turns the clamp-on meter off 3.3

3.6

3.7

3.8

1.2 FUNCTION BUTTONS

1 2 3

6 5 4

Figure 3: Function Buttons

Item Function See §

1 Holds the last value on the display

Zero correction A

Lead resistance compensation in the continuity and
ohmmeter functions

2 Selects the type of measurement and configuration

functions (AC, DC)

3 Enables/disables display backlighting 2.3

4 Activation of ΔREL mode – Displays differential and

relative values

5 Performs Frequency measurements (Hz) 2.5

6 Enables/disables the MAX/MIN mode

Enables/disables the True InRush

DC

®

mode

2.1

3.9.2

3.6.1

2.2

2.6

2.4

1.3 DISPLAY

1

2

3

4

5

6

Figure 4: Display

Item Function See §

1 Low battery indication 5.3

2 Mode selection display 2

3 Active measurement value and unit display 3.5 to 3.12

4 Display of the MAX/MIN modes 2.4

5 Type of measurement (AC or DC) 2.2

6 Temperature unit display 3.4.4

7 Selected resistance measurement display 1.1

1.3.1 Display Symbols

7

Symbol Designation

AC Alternating current or voltage

DC Direct current or voltage

REL

Ref

Max Maximum DC or RMS value

Min Minimum DC or RMS value

V Volt

Hz Hertz

Relative value, with respect to a reference

Reference value

Storage of the values and display hold

A Ampere

°C/°F Temperature unit Celsius or Fahrenheit

% Percentage

Ω 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 TERMINALS

The terminals are used as follows:

12

Figure 5: Terminals

Item Function

1

COM (black) Input Terminal Jack

2 + Positive (red) Input Terminal Jack

2 BUTTONS

The buttons respond differently to short, long, and sustained presses.
The , and keys provide additional functions as well as the
detection and acquisition of parameters complementary to the basic
measurements.

 Each of these buttons can be used independently of the others or in

conjunction with each other. This makes navigation simple and intuitive
when reviewing measurement results.

 It is possible, for example, to either look up in turn sequence the MAX,

MIN, etc. values of the RMS voltage alone, then display relative values
in parallel

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

 Perform automatic lead resistance compensation (see § 3.6.1).
 Perform automatic zero correction in A

Successive
presses on

First press: H

displayed

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

long

(> 2 sec)

long

(> 2 sec)

ADC Performs automatic zero correction (see

NOTE: This mode operates if the MAX/MIN or

HOLD modes (short press) are first de activated

Performs automatic lead resistance
compensation (see 3.6.1)

DC (see § 3.9.2).

Function

olds the display of the last value

3.9.2)

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

and buttons.

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, HOLD and ΔREL modes.

Successive

presses on

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

- C

ycles through the continuity ,  and
diode test modes and returns to the
continuity test

- Selects °C or °F

Function

as the temperature unit

2.3 BUTTON

Successive

presses on

- Enables/disables the backlighting of the
display

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

Function

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 RMS values in 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

short

long (> 2 sec)

NOTE : ΔREL fu

nction can be used with the functions of the MAX/MIN mode.

Function

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 lit steadily.

- 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 first.

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

Successive presses on

- Displays the MAX/MIN values detected

short

before the button was pressed.

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

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

Function

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) for AC or DC current.

Successive presses on

long (>2 sec)

short (<2 sec)

Note: A short press

is functional only if a True

InRush value has been

detected.

Function

- First press: Ent

ers 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 (returns to simple current
measurement).

- Displays the PEAK+ value of the current

- Displays the PEAK- value of the current

- Displays the RMS True InRush

®

current

NOTE: The A, AC and PEAK values flash

during this sequence.

2.5

BUTTON

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

NOTE: This button is not function

al in the DC mode.

2.5.1 Normal Mode

Successive

presses on

Displays:

- The frequency of the signal measured

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

Function

2.5.2 The Hz Function + Activation of the HOLD Mode

Successive

presses on

- 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.

Function

2.6 BUTTON

This button is used to display and store the reference value in the unit of
magnitude measured, or to display the differential and relative values, in %.

Successive

presses on

Enters the ΔREL mode, to store, then display the reference
value. The ΔRef symbol is displayed.

- Displays the differential value:
(current value – reference ()

short

long (>2 sec) - Exits from the ΔREL mode

NOTE: The “Relative mode

The ΔREL symbol is displayed.

- Displays the relative value in %
(current value – reference (
The ΔREL and % symbols are displayed.

- Displays the reference. The ΔRef symbol is displayed

- Displays the current value. The ΔRef symbol blinks.

ΔREL” function can also be used with the functions of

the MAX/MIN mode.

Function

3 USE

3.1 INSTALLING THE BATTERY

Insert the battery 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 9V battery supplied (item 2), observing polarities.

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

2

1

Figure 6 : 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.

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

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%.

®

measurement:

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 change 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.

3.4.5 Con

To configure the Adapter function scale factor :

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

2. To change the value of the scale factor, press the (yellow) button.

Once the scale factor displayed has been chosen, turn the switch to another
position. The value chosen is stored and a double beep is emitted.

figuring the Adapter Function Scale Factor

turning the switch to until the "full screen" display ends and a
beep is emitted, to enter configuration mode. The display unit indicates
the stored scale factor value.
The default stored value is 10. The possible values are, in order:
1, 10k, 100k, 100m, 10m, 1m, 100, 10. (see §3.13)

The currently active scale factor is displayed. Each press of the
(yellow) button displays the next value in the list above.

3.4.6 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 = 1

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.

4. 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.

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 t
follows:

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

old the button down until the display unit indicates the lowest

2. H
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

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

he test lead resistance, proceed as

if it is  2.

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
compe

nsation (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.

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.

3.9.1 AC Measurement

For an AC current measurement, proceed as follows:

1. Set the switch to and select AC by pressing the (yellow
button). The AC symbol is displayed.

2. Clamp the jaws around the conductor to be measured. The device
selects AC or DC automatically.

The measured value is displayed on the screen.

3.9.2 DC Measurement

Set the switch to and select DC if the display does not indicate "0"; the DC
zero must be corrected first.

Step 1: Correction of DC Zero

Important: Th
correction. Hold the clamp in the same position during the whole procedure so
that the correction value will be exact.

Press the button until the device emits a double beep and displays a value
near "0". The correction value is stored until the clamp is powered down.

NOTE: The correction is effected only if the value displayed is < ±10A,
the value displayed blinks and is not stored. The clamp must be recalibrated (see

§ 5.3).

Step 2 : Make a Measurement

1. The switch is set to . Select DC by pressing the (yellow) button

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

e clamp must not be closed on the conductor during the DC zero

otherwise

until the desired choice is reached.

The measured value is displayed on the screen.

3.10 STARTING CURRENT OR OVERCURRENT (True InRush®)
MEASUREMENT

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

1. Set the switch to , correct the DC zero (see §3.9.2), then clamp the
jaws around the conductor to be measured.

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
symbol flashes.

3. After detection and acquisition for 100 ms, the RMS value of the True
InRush

®

current is displayed. Pressing the button will display the

PEAK+/PEAK- values subsequently.

®

current. "------" is displayed and the A

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

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

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

The measured value is displ

ayed on the screen.

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.

3.13 ADAPTER FUNCTION MEASUREMENT

This function makes it possible to connect any adapter or sensor that converts a
measured electrical or physical quantity into a voltage (either DC or AC). A direct,
immediate reading is obtained without applying a conversion factor.

The measurement mode, AC or DC (the default), must be chosen manually using
the yellow button.

The scale factor for the adapter or sensor must be chosen in advance in the
instrument’s set-up (§3.4.5). The table below indicates the various
adapter/sensor sensitivities that allow a direct reading once the scale factor has
been chosen.

Adapter/Sensor
Sensitivity

10 mV/kX (0.01 mV/X) 10 k
100 mV/kX (0.1 mV/X) 100 k
1 mV/X 1
10 mV/X 10
100 mV/X 100
1000 mV/X (1 mV/mX) 1 m
10 mV/mX 10 m
100 mV/mX 100 m

NOTE: The value represented as (X) is valid for any quantity:
humidity (%RH), illumination (lux), speed (m/s), flow, (GPM) etc.

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

2. Set the switch to .

3. Select the AC or DC mode.

4. Connect the adapter according to its directions for use.

Scale Factor to be
Programmed

4 SPECIFICATIONS

4.1 REFERENCE CONDITIONS

Quantities of Influence Reference Conditions

Temperature: 23°C ±2°C

Relative humidity: 45% to 75%

Supply voltage: 9.0V ±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 59.99V 60.0 to 599.9V 600 to 1000V
Specified

measurement range

from 0.00V to 5.99V

Accuracy

Resolution 0.01V 0.1V 1V
Input impedance

Note (1) The display indicates "+OL" above + 2000V and "-OL"

below – 2000V, in REL mode. The "-" and "+" signs are managed.
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.”

±(1% R + 10cts)

from 6.00V to 59.99V

±(1% R +3cts)

0 to 100% of the measurement range

±(1% R +3cts)

10M

(1)

4.2.2 AC Voltage Measurement



Measurement
range
Specified
measurement
range (2)

Accuracy

Resolution 0.01V 0.1V 1V
Input impedance

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".

- Bandwidth in AC = 3 kHz

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

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

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

0.30V in AC):

0.15 to 59.99V 60.0 to 599.9V

0 to 100% of the measurement range

0.15 to 5.99V

± (1% R + 10cts)

6.00 to 59.99V

± (1% R +3cts)

10M

600 to 1000V RMS

1400V peak (1)

± (1% R +3cts)

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

4.2.3 DC Current Measurement

Measurement
Range (2)
Specified
measurement range
Accuracy (2)
(zero corrected)
Resolution 0.01A 0.1A 1A

0.00 to

59.99A
0 to 100% of the measurement range

± (1% R + 10cts) ± (1% R +3cts)

60.0 to

599.9A

600 to 900A (1)

Note (1) The display indicates “+OL” above 1800A and “-OL” below -1800A

in REL mode. The "-" and "+" signs are displayed.

Note (2) The resi

corrected by the “DC zero” function of the HOLD button.

dual current at zero depends on the remanence. It can be

4.2.4 AC Current Measurement





Measurement
Range

0.15 to 59.99A 60.0 to 599.9A 600A

(1)

Specified
Measurement

(2)

Range

0 to 100% of the measurement range

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

Note (1) Bandwidth in AC = 3kHz

Note (2) In AC, 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.

4.2.5 True Inrush® Measurement

Measurement Range 6 to 600A
Specified Measurement Range 0 to 100% of the measurement range
Accuracy ± (5% R + 5cts)
Resolution 1A

Specific Specifications in PEAK mode in True InRush

AC 6 to 900ADC

®

(from 10Hz to 1kHz):

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

4.2.6 Continuity Measurement

Measurement Range
Open-circuit Voltage
Measurement Current 550µA
Accuracy ± (1% R +5cts)
Buzzer Triggering Threshold

Adjustable from 1 to 599

0.0 to 599.9

3.6V

(40 is the default)

4.2.7 Resistance Measurement





(1)

Measurement Range
Specified Measurement

Range
Accuracy ± (1% R +5cts)
Resolution
Open-circuit Voltage
Measurement Current 550µA 100µA 10µA

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

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

Specific Specifications in MAX/MIN mode:

(1)

0.0 to

599.9

1 to 100% of the

measurement range

0.1

600 to

5999

0 to 100% of the

measurement range

110

3.6V

6.00 to

59.99k

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

4.2.8 Diode test

Measurement Range 0.000 to 3.199V
Specified Measurement Range 1 to 100% of the measurement range
Accuracy ± (1% R + 10cts)
Resolution 0.001V
Measurement Current 0.55mA
Indication: junction reversed or

open-circuit

"OL" is displayed when the measured

voltage >3.199V

DC



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

4.2.9 Frequency Measurements

4.2.9.1 Voltage

Measurement Range
Specified Measurement

Range
Accuracy ± (0.4% R + 1ct)

Resolution 0.1Hz 1Hz 10Hz

5.0 to 599.9Hz 600 to 5999Hz 6.00 to 19.99kHz
1 to 100% of the

measurement

range

0 to 100% of the

measurement range

4.2.9.2 Current

Measurement Range (1) 5.0 to 599.9Hz 600 to 2999Hz
Specified Measurement
Range
Accuracy ± (0.4% R + 1ct)
Resolution 0.1Hz 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<3V or
I<3A) 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):

1 to 100% of the

measurement range

0 to 100% of the

measurement range

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

4.2.10 Temperature Measurement

Function External temperature

Type of Sensor K-thermocouple

Measurement Range

Specified Measurement
Range

Accuracy (1)

Resolution

-60.0° to +599.9°C

-76.0° to +1111.8°F
1 to 100% of the

measurement range

1% R ±3°C

1% R ±5.4°F

0.1°C

0.1°F

+600° to +1200°C

+1112° to +2192°F

0 to 100% of the

measurement range

1% R ±3°C

1% R ±5.4°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 const

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:

ant (0.7min/°C):

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

4.2.11 Adapter Function Measurement





4.2.11.1 In DC mode

Measurement Range (1) 0.0 to 599.9mV 0.60 to 5.999V
Specified Measurement Range (2) 0 to 100% of the measurement range
Accuracy 1% R ±3cts
Resolution 0.1mV 1mV
Input Impedance

10M

4.2.11.2 In AC mode

Measurement Range (1) 5.0 to 599.9mV 0.600 to 5.999V
Specified Measurement
Range (2)

Accuracy

Resolution 0.1mV 1mV
Input Impedance

Note (1) The basic display is 6000 counts. The position of the decimal count

and the display of multiples (m and k) depend on the programming of
the scale factor.



In DC, the display indicates "+OL" above +5999 counts and "-

OL" below -5999 counts. The "-" and "+" signs are managed

(polarity).



In AC, the display indicates "OL" above 5999 counts.

1 to 100% of the

measurement range

5.0 to 59.9mV

± (1% R + 10cts)

60.0 to 599.9mV
± (1% R +3cts)

0 to 100% of the

measurement range

10M

1% R ±3cts

Note (2) - The max. bandwidth is 1kHz.

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.

4.3 ENVIRONMENTAL CONDITIONS

Conditions Operating Storage

Temperature -4° to +131°F

(-20° to +55°C)

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

-40° to +158°F

(-40° to +70°C)

4.4 MECHANICAL SPECIFICATIONS

Housing Rigid polycarbonate shell with molded elastomer covering

Polycarbonate

Jaws

Screen

Dimension 8.7 x 3.1 x 1.65" (222 x 78 x 42mm)

Weight 12 oz (340g) with the battery

Opening: 1.34" (34mm)
Clamping diameter: 1.34" (34mm)

LCD display unit
Blue backlighting
Dimension: 1.1 x 1.7" (28 x 43.5mm)

4.5 POWER SUPPLY

Battery 1x9V LF22

Battery life >130 hours (without backlighting)

Auto Power Off After 10 minutes with no switch and/or button activity

4.6 COMPLIANCE WITH INTERNATIONAL STANDARDS

Compliant with standards IEC-61010-1,

Electric Safety

Electromagnetic

Compatibility

Mechanical strength

Level of Protection

IEC-61010-2-30, and IEC-61010-2-32:
1000V CAT III or 600V CAT IV

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

Free fall: 2m (in accordance with standard

IEC-68-2-32)

Housing: IP40 (per standard IEC-60529)

Jaws: IP40

4.7 ENVIRONMENTAL VARIATIONS

Condition of

Influence

Temperature

Range of
Influence

-4° to +131°F

(-20° to +55°C)

Humidity 10 to 90% RH

10Hz to 1kHz

Frequency

1kHz to 3kHz
10Hz to 400Hz
400Hz to 3kHz

Position of

the conductor

in the

jaws

(f400Hz)

Adjacent
conductor
carrying a

current of

150A

DC or

RMS

Any position

on the internal

perimeter of

the jaws

Conductor

touching the

external

perimeter of

the jaws

Conductor

enclosed by

0 to 500ARMS V

the clamp

Application of

a voltage on

the clamp

0 to 1000V

or RMS

1.4 to 3.5,

Peak factor

limited

to 1500A peak

1400V peak

Measurement

DC

Influence

Influenced

V

AC

V

DC

A

T°C

Hz



V
A

V

A

Typical MAX

-

0.1% R/10°C
1% R/10°C

(0.2% R +1°C)/10°C

0.1% R/10°C + 2ct

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

0.1% R 0.1% R + 1ct

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

0.1% R/10°C

A 2% R 4% R + 1ct

A 42dB 35dB

 1ct

A

A (AC)
V (AC)

 1ct

1% R
1% R

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

1ct

3% R + 1ct

3% R + 1ct

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

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

To replace the battery, 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 (see §3.1).

4. Remove the used battery and replace it with a 9V LF22 battery,
observing the polarities.

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

BATTERY

8 LIMITED WARRANTY

The Model 203 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.

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
option, repair or replace the faulty material.

®

Instruments will, at its

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
15 Faraday Drive • Dover, NH 03820 USA

Tel: [phone] (Ext. 360)

[phone] (Ext. 360)

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

, Inc. d.b.a. AEMC® Instruments

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.

NOTES:

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

99-MAN 100420 v2 04/16

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

TestEquipmentDepot.com