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1 689 979 642

2014-11-03

Robert Bosch GmbH

18  |  MMD 302  |  General Information

en

2.5 

Danger of injury, Danger of crushing

The vehicle has rotating and moving parts 
that can injure fingers and arms.

If the vehicle is not prevented from roll-
ing away, there is a danger of people being 
crushed against a workbench, for example.

There is the risk with electrically operated 
fans in particular that the fan can start run-
ning unexpectedly even when the engine and 
ignition are off.

Safety measures:

 

Take steps to prevent the vehicle from rolling away 
while it is being tested. Select the park position if the 
vehicle has an automatic transmission and apply the 
handbrake or lock the wheels with chocks (wedges).

 

Deactivate the start/stop system when working on a 
vehicle in order to prevent uncontrolled engine start.

 

Operating staff must wear work clothes without 
loose bands and loops.

 

Do not reach in any area with rotating or moving parts.

 

When working on or in the vicinity of electrically 
driven fans, allow the engine to cool down first, then 
disconnect the plug of the fan motor.

 

Route cables at a suitable distance from rotating parts.

 

Secure the trolley against rolling away by setting the 
brakes.

 

Do not place heavy objects on or lean on the sensor 
holder.

 

Transport and operate the equipment only in accor-
dance with the operating instructions.

3.  General Information

3.1 

User profile

The MMD 302 was designed for trained, specialised 
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

Direct and alternating voltage measurement

 

R

Continuity test (acoustic) and resistance  
measurement

 

R

Capacitance and diode test

 

R

Frequency measurement

 

R

Alternating and direct current measurement

 

R

MIN./MAX. operating mode, recording and storage of 
minimum and maximum mea- sured values

 

R

REL-∆ operating mode, display of the difference be-
tween current and stored measured value

 

R

HOLD-function for "freezing" the display

3.3 

Function description

The MMD 302 (MMD = 

M

ulti

m

eter 

D

igital) is a com-

pact and battery-operated digital multi meter. It has a 
3 3/4-digit display with an additional analog display, 
which consists of 42 segments. It has an automatic 
device-shut-down circuit, which is actuated approx. 
30 minutes after the last button is pressed (in order to 
spare the batteries).

3.4 

Scope of delivery

 

R

MMD 302 digital multimeter

 

R

Red measuring cable with test probe

 

R

Black measuring cable with test probe

 

R

Red connecting terminal

 

R

Black connecting terminal

 

R

Protective rubber cover with stand

 

R

2 commercially available dry batteries (installed) 1.5 V 
Micro type / AAA / AM4 / LR03 / MN2400-1.5 V

 

R

Operating instructions

The accessories provided are only to be used 
in conjunction with the MMD 302 and for 
voltages lower than the value marked on the 
accessories. When combining accessories 
with the MMD 302, care must be taken not to 
exceed the lowest marked voltage value in the 
measurement chain.

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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