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1 689 979 642

2014-11-03

Robert Bosch GmbH

24  |  MMD 302  |  Maintenance

en

6.  Technical Data

6.1 

General data

Designation

Value

Measurement speed

Digital displays 2 second 

analog displays 20/second

Automatic appliance shut-off

Approx. 30 minutes after 

last switch is pressed

Operating temperature

10 °C bis +40 °C

Storage temperature

-20 °C bis +60 °C

Temperature coefficient

0.1 x specific accuracy/°C 

(<18 °C or <28 °C)

Relative humidity

0 % to 80 %  

(0 °C to 50 °C)

Maximum usage altitude

2000 m

Type of protection

IP 20

Voltage supply

2 commercially available 

dry batteries, 1.5 V Type Mi-

cro / AAA / AM4 / LR03 / 

MN2400-1.5 V

Battery life

Approx. 1,000 hours with al-

kaline-manganese batteries

Dimensions 

Without protective rubber cover: 

with protective rubber cover: 

 

185 mm x 86 mm x 32 mm,

200 mm x 98 mm x 52 mm

Weight 

Without protective rubber cover 

with protective rubber cover

 

370 g 

600 g

6.2 

Measurement category as per 

EN 61010

EN 61010-2-033:2012 specifies the general safety re-
quirements for hand-held measuring instruments and 
defines the measurement categories from 0 to IV.
Both the MMD 302 and the terminals and measurement 
cables supplied are designed for test and measurement 
circuits of category 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 acting fuse 

(Bussmann KTK 15, Littelfuse KLK 15A or similar 
rating)  
Dimensions: 10.3 x 38 mm

Fig. 3: 

Changing the fuses

1  Housing upper section

2   Housing lower section

3   F1 (1A/600V)

4   F2 (15A/600V)

1. 

Disconnect the measuring cables from the measure-
ment object and the MMD 302.

2. 

Turn the measurement-mode switch to the OFF position.

3. 

Remove the three screws from the back of the appliance.

4. 

Lift the lower end of the housing lower section until 
it clicks out of the housing upper section.

5. 

Remove the battery holder.

6. 

Lift the PCBs vertically out of the housing upper 
section.

7. 

Replace faulty fuse.

8. 

Reinsert PCBs.

9. 

Reinsert the battery holder in the appliance. During 
reassembly, ensure that the battery cables are not 
crushed.

10. 

Check the o-rings and the rubber seal are positioned cor-
rectly between the housing upper and lower sections.

11. 

Reattach the housing lower section. Ensure that it 
clicks into position at the upper end of the housing.

12. 

Reinsert and tighten the three screws.

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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