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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 
inst 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 

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 

OFF

OFF

Hz

%

Continuity test 

OFF

OFF

Hz

%

+

R < 90 

Ω = 

+

Measurement of the frequency of the signal (      )

OFF

OFF

Hz

Measurement of the duty cycle (      )

Hz

%

OFF

OFF

Hz

%

RANGE

SELECT

HOLD

OFF

OFF

REL

Hz %

Hz

%

DMM 121 

RANGE

SELECT

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

RANGE

SELECT

HOLD

MULTIMETER

10A

OFF

OFF

REL

Hz %

Hz

%

DMM 121 

RANGE

SELECT

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.

RANGE

SELECT

HOLD

REL

Hz %

RANGE

SELECT

HOLD

REL

Hz %

RANGE

SELECT

HOLD

REL

Hz %

RANGE

SELECT

HOLD

REL

Hz %

RANGE

SELECT

HOLD

REL

Hz %

RANGE

SELECT

HOLD

REL

Hz %

RANGE

SELECT

HOLD

REL

Hz %

Hz

%

OFF

OFF

Hz

%

RANGE

SELECT

HOLD

REL

Hz %

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