Multimetrix DMM121 Instruction Manual

You have just purchased a DMM121 digital multimeter
and we thank you for your confidence.

For best results from your instrument:

 read these operating instructions carefully,
 comply with the precautions for use.

PRECAUTIONS FOR USE

This instrument and accessories are compliant with
safety standards IEC 61010-1, IEC 61010-031 and
IEC 61010-2-033 for voltages up to 600V in category III.
Failure to observe the precautions for use and safety
instructions may cause an electric shock, fire, explosion,
or destruction of the instrument and of the installations.

 The operator and/or the responsible authority must

carefully read and clearly understand the various
precautions to be taken in use.

 If you use this instrument other than as specified, the

protection it provides may be compromised, thereby
endangering you.

 Do not use the instrument on networks of which the

voltage or category exceeds those mentioned.
 Observe the environmental conditions of use.
 Do not exceed the rated maximum voltages and

currents between terminals or with respect to earth.
 Do not use the instrument if it seems to be damaged,

incomplete, or poorly closed.
 Before each use, check the condition of the insulation

on the leads, housing, and accessories. Any item of

which the insulation is deteriorated (even partially) must

be set aside for repair or scrapping.
 Use only the leads and accessories supplied. Using

leads (or accessories) of a lower voltage or category

reduces the voltage or category of the combined

instrument + leads (or accessories) to that of the leads

(or accessories).
 Use personal protective equipment when conditions

require.
 When handling the leads, test probes, and crocodile

clips, keep your fingers behind the physical guard.
 Keep your hands away from the terminals of the

instrument.
 Replace the battery as soon as the symbol appears

on the display unit. Disconnect all leads before opening

the battery compartment cover.

PRESENTATION

The DMM121 is a device for measuring electrical
quantities:

 AC or DC voltage measurement;
 DC and AC current measurement;
 Frequency measurement;
 Capacitance measurement;
 Resistance measurement, continuity measurement

with buzzer or diode test.

LCD display
unit

Keys

Input
terminals

Switch

Impact-resistant
jacket

Battery
compartment
cover

Definition of measurement categories

 Measurement category IV corresponds to

measurements taken at the source of low-voltage
installations.

 Measurement category III corresponds to

measurements on building installations.

 Measurement category II corresponds to

measurements taken on circuits directly connected
to low-voltage installations.

USE

IINSERTING THE BATTERIES

See § Maintenance.

TEST OF OPERATION

SELECT



CHANGING RANGES

OFF

OFF

Hz

%

HOLD OF THE DISPLAY

Hz %



Hz %



HZ AND % FUNCTIONS

For AC voltage and current measurements, they are used
to display the frequency and the duty cycle of the signal
measured, respectively.

REL D FUNCTION

The REL D key is used to subtract the value displayed
at the time the key is pressed from all subsequent
measurements values and to display the result of the
subtraction. This function is not available when “OL” is
displayed.

The automatic power down function of the device is
reactivated when the device is switched back on.

CHANGING MODES

Several modes may be available for a given function
(existence of additional modes indicated by a yellow
symbol). Press the SELECT key to change which mode
is active.

+

SELECT



OFF

OFF

Hz

Diode test

Ω

OFF

OFF

Hz

%

Continuity test

OFF

OFF

Hz

%

+

Ω

R < 90 Ω =

+

Measurement of the frequency of the signal ( )

OFF

OFF

Hz

Measurement of the duty cycle ( )

Hz

%

OFF

OFF

Hz

%

RANGESELECT HOLD

OFF

OFF

REL

Hz %

Hz

%

DMM 121

RANGESELECT HOLD

OFF

OFF

REL

Hz %

Hz

%

DMM 121

30 min

Hz

+

Hz %

Prop

Hz

%

%

Battery
compartment
cover screws

REL



Resistance measurement

BACK-LIGHTING

De-activating the automatic power down

MEASUREMENTS

The input voltage must not exceed 600V.

DC voltage measurement

Capacitance measurement

SWITCHING OFF THE MULTIMETER
Manual switching off
Set the switch to OFF.

Automatic power down

OFF

OFF

Hz

%

≈

AC voltage measurement

+

+

Resistance and capacitance measurements and
diode and continuity tests must be performed
on voltage-free circuits.

DMM121

Multimeter

SELECT

RANGE

REL

HOLD

Hz %

OFF

OFF

Hz

%

OFF

OFF

Hz

SELECT

SELECT



SELECT



+

SELECT



SELECT



+

SELECT



RANGESELECT HOLD

MULTIMETER

10A

OFF

OFF

REL

Hz %

Hz

%

DMM 121

RANGESELECT HOLD

MULTIMETER

10A

OFF

OFF

REL

Hz %

Hz

%

DMM 121

GB

WARNING, risk of DANGER! The operator
must refer to this user’s manual whenever this
danger symbol appears.

Equipment protected by double insulation.

Earth.

Instruction that must be read and understood.

AC - Alternating current.

DC - Direct current.

Battery.

The CE marking indicates conformity with
European directives.

The rubbish bin with a line through it means
that in the European Union, the product
must undergo selective disposal for the
recycling of electric and electronic material,
in compliance with Directive WEEE 2002/96/
EC. This equipment must not be treated as
household waste.

OFF

OFF

Hz

%

>2s

AUTO RANGE

AUTO RANGE



RANGE



RANGE



RANGE

HOLD



80 sec.

RANGESELECT HOLD

REL

Hz %

RANGESELECT HOLD

REL

Hz %

RANGESELECT HOLD

REL

Hz %

RANGESELECT HOLD

REL

Hz %

RANGESELECT HOLD

REL

Hz %

RANGESELECT HOLD

REL

Hz %

RANGESELECT HOLD

REL

Hz %

Hz

%

OFF

OFF

Hz

%

RANGESELECT HOLD

REL

Hz %

For safety reasons this fuse must always be
replaced by an identical model:
F1: 10x38, type FF, 10A/600V
F2: 6.3x32, type FF, 630mA/600V

When the current measured exceeds the rating of the
fuse, the fuse may blow.

REPAIR

Return the instrument to your distributor for any work to
be done, whether under the warranty or not.
If you have to ship the instrument, it is best to use its
original packaging and to state as clearly as possible,
in a note attached to the equipment, the reasons for the
transfer.

WARRANTY

The equipment is warranted against defects of materials
or workmanship, in accordance with the general terms
of sale.
During the warranty period (1 year), the instrument must
be repaired only by the manufacturer, who reserves
the right to choose between repairing it or replacing it,
entirely or partially.
If the equipment is sent back to the manufacturer,
carriage is paid by the customer.

The warranty does not apply in the following cases:

 Inappropriate use of the equipment or use with

incompatible equipment;

 Modifications made to the equipment without the

explicit permission of the manufacturer’s technical
staff;

 Work done on the device by a person not approved

by the manufacturer;

 Adaptation to a particular application not anticipated

in the definition of the equipment or not indicated in
the user’s manual;

 Damage caused by shocks, falls, or floods.

TO ORDER

DMM 121 ................................................... P06231421Z

POWER SUPPLY

Battery: 2x1.5V AA/LR6
Mean battery life: ~400 hours
Auto power off delay: After 30 minutes without action on
the keys and/or on the switch.

COMPLIANCE WITH INTERNATIONAL STANDARDS

Compliant with standards IEC 61010-1 and IEC 61010­2-033 for 600V CAT III installations.
Maximum input voltage: 600V between terminals.

ELECTROMAGNETIC COMPATIBILITY

Emissions and immunity in an industrial environment
per EN 61326-1.

MAINTENANCE

Except for the fuse and the batteries, the
instrument contains no parts that can be replaced by
personnel who have not been specially trained and
accredited. Any unauthorized repair or replacement of a
part by an “equivalent” may gravely impair safety.

CLEANING

Disconnect the unit completely and turn the rotary switch
to OFF.
Use a soft cloth, dampened with soapy water. Rinse with
a damp cloth and dry rapidly with a dry cloth or forced
air. Do not use alcohol, solvents, or hydrocarbons.

REPLACEMENT OF THE BATTERIES

The symbol indicates that the batteries are dead and
must be replaced.
To replace the batteries, proceed as follows:

 Disconnect the unit completely and turn the rotary

switch to OFF;
 Remove the jacket;
 Unscrew and remove the 4 battery compartment

cover screws;
 Remove the old batteries and insert the new ones,

with the polarities as indicated.

Spent batteries must not be treated as ordinary
household waste. Take them to the appropriate
recycling collection point.

REPLACING THE FUSE

When the measurement current exceeds the current
rating of the fuse, the protection fuse may blow.

Resistance measurement

Range

Intrinsic

uncertainty

Observation

400.0 Ω 0.5 % + 3 ct

No-load voltage:

approx. 0.4V

4.000 kΩ

0.5 % + 2 ct

40.00 kΩ

400.0 kΩ

4.000 MΩ

40.00 MΩ 1.5 % + 3 ct

Continuity measurement

Range Observations

400.0 Ω

- No-load voltage: approx. 0.4V

-

: R < 90 Ω ± 40 Ω

Capacitance measurement

Range

Intrinsic

uncertainty

Observation

50.00 nF 1.5 % + 15 ct

The response

time may be
long at high

values

500.0 nF 2 % + 5 ct

5.000 μF

5 % + 5 ct50.00 μF

100.0 μF

Measurement of frequency and duty cycle (Hz% key)
in voltage and current

Function limited to industrial frequencies.
Minimum input level: 10% of the range in voltage and
55% of the range in current.
The values of the duty cycle are indicative.

Frequency measurement (input )

The “Hz” setting eliminates the constraint of the limited
pass band in voltage measurements.

Range

Minimum

input

voltage

Intrinsic

uncertainty

Observa-

tion

5.000 Hz

2 Vpp

0.1 % +
3 ct

Given for

a square

wave

50.00 Hz

500.0 Hz

5.000 kHz

50.00 kHz

500.0 kHz

5.000 MHz

ENVIRONMENTAL CONDITIONS

Indoor use
Altitude < 2.000 m
Degree of pollution: 2

In use In storage

Temperature -10 °C ... +50 °C -20 °C ... +60 °C

Relative
humidity

≤ 80 %RH

(without

condensation)

≤ 70 %RH

(without

condensation)

CONSTRUCTIVE CHARACTERISTICS

Dimensions L x W x H: 181 x 92 x 57 mm
Weight: approx. 400 g

CHARACTERISTICS

ELECTRICAL CHARACTERISTIC

Reference conditions

Quantity of influence Reference value

Temperature 23 ± 2°C

Relative humidity 45 to 75% RH

DC measurement Without AC component

AC measurement Sine wave without DC

Frequency measurement Square wave without DC

The intrinsic uncertainties are stated in
± (x % of reading + Y points) from 10 to 100% of the range

AC voltage measurement

Range Frequency

Intrinsic

uncertainty

Input

resistance

400.0 mV

40 Hz ­500 Hz

1 % + 10 ct ~ 11 MΩ

4.000 V

1 % + 5 ct ~ 10 MΩ

40.00 V

400.0 V

600 V

DC voltage measurement

Range

Intrinsic

uncertainty

Input resistance

400.0 mV

0.5 % + 3 ct

≥ 100 MΩ

4.000 V ~ 11 MΩ

40.00 V

~ 10 MΩ400.0 V

600 V*

DC current measurement

Intrinsic uncertainty: 1.5% + 3 ct

Range Protection

400.0 μA

Fuse 0.63 A /600 V

4000 μA

40.00 mA

400.0 mA

10.00 A* Fusible 10 A /600 V

* 20 A for 30 s.

AC current measurement

Intrinsic uncertainty: 1.5% + 5 ct

Range Frequency Protection

400.0 μA

40 Hz - 500 Hz

Fuse 0.63 A

/600 V

4000 μA

40.00 mA

400.0 mA

4.000

/10.00 A*

Fuse 10 A

/600 V

* 20 A for 30 s.

Diode test

Range

Intrinsic

uncertainty

No-load

voltage

4.000 V 10 % ~ 1.5 V

DC current measurement

OFF

OFF

Hz

%

OFF

OFF

Hz

AC current measurement

µA

mA

A

OFF

OFF

Hz

%

RANGESELECT HOLD

REL

Hz %

+

OFF

OFF

Hz

%

OFF

OFF

Hz

%

OFF

OFF

Hz

+

+

≈

µA

mA

A

SELECT



SELECT



SELECT



RANGESELECT HOLD

REL

Hz %

11 - 2013

694310A02 - Ed. 2

http://www.chauvin-arnoux.com

FF 630mA/1000V

FF 10A/1000V

F1

F2