Bosch MMD 302 Original Instructions Manual Download Page 3

1 689 979 642

2014-11-03

Robert Bosch GmbH

16  |  MMD 302  |  Symbols used

en

1.  Symbols used

1.1 

In the documentation

1.1.1 

Warning notices - Structure and meaning

Warning notices warn of dangers to the user or people 
in the vicinity. Warning notices also indicate the con-
sequences of the hazard as well as preventive action. 
Warning notices have the following structure:

Warning 
symbol

KEY WORD – Nature and source of hazard!

Consequences of hazard in the event of fail-
ure to observe action and information given.

 

Hazard prevention action and information.

The key word indicates the likelihood of occurrence and 
the severity of the hazard in the event of non-obser-
vance:

Key word

Probability of 

 occurrence

Severity of danger if in-

structions not observed

DANGER

Immediate

 impend-

ing 

danger

Death

 or 

severe 

injury

WARNING

Possible

 impending 

danger

Death

 or 

severe 

injury

CAUTION

Possible 

dangerous

  

situation

Minor

 injury

1.1.2 

Symbols in this documentation

Symbol Designation

Explanation

!

Attention

Warns about possible property damage.

i

Information

Practical hints and other  

useful information.

1.

2.

Multi-step  

operation

Instruction consisting of several steps.

e

One-step  

operation

Instruction consisting of one step.

  

Intermediate 

result

An instruction produces a visible inter-

mediate result.

"

Final result

There is a visible final result on com-

pletion of the instruction.

1.2 

On the product

 

!

Observe all warning notices on products and ensure 
they remain legible.

Instructions for your personal safety and 
for the protection of equipment/vehicle 
components

2.  Safety instructions

2.1 

Risk of electric shocks

2.1.1 

Low voltages, high voltages

Hazardous voltages occur in both the lighting 
system and the electrical system of a motor 
vehicle. If contact is made with live parts 
(e.g. with the ignition coil), there is a risk of 
electric shock from flashover voltages caused 
by damaged insulation (e.g. ignition cables 
which have been attacked by martens). These 
apply to the secondary and primary sides of 
the ignition system, the wiring harness with 
connectors, lighting system (Litronic) as well 
as connection to the vehicle.

Safety measures:

 

Only  connect to a properly grounded outlet.

 

Only the enclosed or a tested power supply cable is 
to be used.

 

All extension cables must be fitted with shock-proof 
contacts.

 

Do not exceed the voltage limits as specified on the 
connection cables.

 

Any cables with damaged insulation must be re-
placed.

 

Before connecting it to the vehicle, first connect the 
product to the lighting mains and switch on.

 

Before switching on the ignition connect the (B-) 
cable to engine ground or the battery (B–) terminal.

 

Always switch off the ignition before performing any 
work on the electrical system of the vehicle. Inter-
vention includes, for instance, connection to the 
vehicle, replacement of ignition system components, 
removal of equipment (e. g. alternators), connection 
of equipment to a test bench.

 

Wherever possible, tests and settings should always 
be caried out with the ignition switched off and the 
engine stationary.

 

If tests or settings are carried out with the ignition 
switched on or the engine running, care must be 
taken not to touch any live parts. This applies to all 
connection cables and leads as well as to connec-
tions of equipment to test benches.

 

Test connections must always be made using suit-
able connectors (e.g. Bosch testing cable set or 
vehicle-specific adapter cables).

 

Make sure that all test connections are properly 
plugged in and secure.

 

Before disconnecting the (B-) cable from the engine 
ground or battery (B–), switch off the ignition.

 

Never open the enclosures.

Disposal

Dispose of used electrical and electronic 
devices, including cables, accessories and 
batteries, separately from household waste.

Summary of Contents for MMD 302

Page 1: ...e Multimètre numérique es Manual original Multímetro digital it Istruzioni originali Multimetro digitale MIN MAX REL HOLD RANGE PRW RST H OFF V V ADPHz 4mA 40mA 400 mA A A mA V Hz MAX CAT III 600V DC AC REL MAX MIN MEM mVA C nuF MK Hz 0 10 20 30 40 AUTO H 456161 01_Ko COM MAX MAX 400mA FUSED FUSED 10 A cont 20 A 30sec ...

Page 2: ...unction button 19 3 5 3 MIN MAX button 19 3 5 4 REL button 19 3 5 5 HOLD button 20 3 5 6 PWR RST button 20 3 5 7 RANGE button 20 3 5 8 Measurement mode switch 20 4 Connection and operation 20 4 1 Alternating and direct current measurement 20 4 2 Acoustic continuity test and resistance measurement 20 4 3 Capacitance measurement and diode test 21 4 3 1 Capacitance measurement 21 4 3 2 Diode test 21 ...

Page 3: ... live parts e g with the ignition coil there is a risk of electric shock from flashover voltages caused by damaged insulation e g ignition cables which have been attacked by martens These apply to the secondary and primary sides of the ignition system the wiring harness with connectors lighting system Litronic as well as connection to the vehicle Safety measures Only connect to a properly grounded...

Page 4: ...components If high voltage components or high voltage wires are inexpertly handled there is a risk of fatal injury from high voltages and the possi ble transmission of current through the body Deenergization is only to be performed by a qualified electrician a qualified electri cian for specific tasks hybrid or a power systems engineer Work on vehicles with high voltage com ponents is only ever to...

Page 5: ...personnel such as mechanics electricians technicians and engineers in the area of automotive engineering 3 2 Application The MMD 302 is only intended for indoor use The MMD 302 is a measuring device for R R Direct and alternating voltage measurement R R Continuity test acoustic and resistance measurement R R Capacitance and diode test R R Frequency measurement R R Alternating and direct current me...

Page 6: ... mode switch pressing this function button switches between R R Continuity test and resistance measure ment R R Capacitance measurement and diode test R R Frequency measurement R R Direct and alternating current measurement 3 5 3 MIN MAX button R R The minimum memory is activated by pressing the button once the smallest measured value is saved and displayed R R The maximum memory is activated by p...

Page 7: ...ernating current up to 400 mA changeover between direct and alternating current by means of the blue function button A Measurement of direct and alternating current up to 10 A changeover between direct and alternat ing current by means of the blue function button 4 Connection and operation The following applies to all measuring modes and ranges The correct measuring mode must first be selected in ...

Page 8: ...onnect red measuring cable to test input for volt age measurement fig 1 pos 12 2 Turn measurement mode switch fig 1 pos 8 to ADP Hz position and switch over to frequency measurement by means of the blue function button fig 1 pos 2 Hz appears in the display 4 5 Current measurement Always observe the current limit values of the se lected measuring range and at the test inputs i i In the case of all ...

Page 9: ...g agents and coarse workshop cloths The rubber cover can be removed for cleaning purposes Do not use alcohol based cleaning agents as these could leave residue 5 2 Spare parts and parts subject to wear Designation Part Number Cable set red and black measuring cables 1 687 011 323 Connecting terminal red 1 681 354 023 Connecting terminal black 1 681 354 024 Protective rubber cover 1 680 591 026 1A ...

Page 10: ...s played value remains unchanged approx 3 V the F2 fuse is faulty and must be replaced 5 5 Changing the batteries The batteries may only be changed when the MMD 302 is not connected to a measurement object Fig 2 Changing the batteries 1 Housing upper section 2 Housing lower section 3 Protective rubber 4 Battery holder 5 1 5 V battery 1 Remove measuring cables from the measuring object and the MMD ...

Page 11: ... III The maximum permissible volt ages for CAT III 600 V must never be exceeded 5 6 Changing the fuses The fuses may only be changed when the MMD 302 is not connected to a measurement object Only fuses with the following specifications may be used Fuse F1 1 A 600 V IR 10KA fast acting fuse Buss mann BBS 1 Littelfuse BLS 1 A or similar rating Dimensions 10 3 x 35 mm Fuse F2 15 A 600 V IR 10KA fast ...

Page 12: ... 2kHz 400 Ω 0 1 Ω 40 Ω 399 9 Ω Resistance 400 Ω 4 kΩ 40 kΩ 400 kΩ 4 MΩ 40 MΩ 0 1 Ω 1 mΩ 10 mΩ 0 1 Ω 1 kΩ 10 kΩ 0 4 3 digit 0 4 2 digit 0 4 2 digit 0 4 2 digit 0 6 3 digit 1 5 5 digit 399 9 Ω 3 999 kΩ 39 99 kΩ 399 9 kΩ 3 999 MΩ 39 99 MΩ Diode test 3 0 V 1 mV Impedance 10 MΩ less than 100 pF Voltage drop maximal 800 mV for mA test input maximal 1 V for A test input Test input protection Fuse F1 1 A ...

Page 13: ...Robert Bosch GmbH Automotive Service Solutions Franz Oechsle Straße 4 73207 Plochingen DEUTSCHLAND www bosch com bosch prueftechnik bosch com 1 689 979 642 2014 11 03 ...

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