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Operating instructions/ Suggested uses

 

Digital multimeter, Order no. 10002896 

 

Congratulations on purchasing a Rothewald digital multimeter. This is a battery-

powered manual multimeter that can be used for measuring DC and AC 

voltages, current strengths and resistances and also for testing diodes.  

A protective cover with built-in stand and two test cables are included. 

Please follow all the operating and safety instructions to ensure that the unit is 

used safely and to keep it in good condition. 

Before using this unit with your bike or car, consult your vehicle's repair and 

maintenance manual for the requisite measured values and model-specific 

measurement instructions. 

Improper use of this multimeter may result in damage to the device itself or to 

your vehicle! 

 

Control panel

 

1: 15 mm high LCD display, 3 1/2 digit. 

2: Rotary switch for On/Off, and for selecting function and measuring range. 

Clockwise rotation selects the following functions / ranges: 

Off; AC voltmeter 600 V, 200 V; DC ammeter 20 µA, 200 µA, 2 mA, 20 mA, 

200 

mA, 10 A; diode testing; ohmmeter 200 Ω, 2 kΩ, 20 kΩ, 200 kΩ, 2 MΩ; 

DC voltmeter 200 mV, 2 V, 20 V, 200 V, 600 V. 

3: Hold function: if "Hold" is pressed, the display will retain the last measured 

value and will indicate this with an "H" symbol until "Hold" is pressed again. 

4: 10 A jack, unfused: insert the positive test cable (red) here to measure 

currents in the 10 A measuring range. 

5: COM jack: insert the negative test cable (black) here. 

6: VΩmA jack: insert the positive test cable (red) here to measure voltage, 

resistance and DC (up to 200 mA, fused). 

 

 

Summary of Contents for 10002896

Page 1: ...ns Improper use of this multimeter may result in damage to the device itself or to your vehicle Control panel 1 15 mm high LCD display 3 1 2 digit 2 Rotary switch for On Off and for selecting function and measuring range Clockwise rotation selects the following functions ranges Off AC voltmeter 600 V 200 V DC ammeter 20 µA 200 µA 2 mA 20 mA 200 mA 10 A diode testing ohmmeter 200 Ω 2 kΩ 20 kΩ 200 k...

Page 2: ...lay Reversed polarity message appears on the display Low battery message battery symbol appears on the display Operating temperature 0 to 40 C Storage temperature 10 to 50 C Max humidity for storage 80 non condensing Dimensions 138 x 69 x 31 mm Weight approx 160 g Mode Measuring range Resolution Accuracy DC voltage 200 Mv 0 1 mV 0 5 2 dgts 2 V 1 mV 0 5 2 dgts 20 V 10 mV 0 5 2 dgts 200 V 100 mV 0 5...

Page 3: ...ditions if the air contains dust flammable gases vapours or solvents in thunderstorms or near powerful electromagnetic fields If the instrument is moved from a cold into a warm environment condensate may form inside it It should not therefore be switched on until it has reached room temperature Always select the measurement function and range carefully Never exceed the measuring range If there is ...

Page 4: ... can be measured The 10 A range is not fused and therefore measurement in this range must only be carried out on circuits equipped with their own fuses No voltages of above 250 V are allowed A measurement of 10 amps should only continue for 10 s and must be followed by a 15 minute cool down period Never perform resistance measurements on live components Maintenance If the display is blank possible...

Page 5: ...suring range start with greatest measuring range and then reduce it a little at a time until the ideal measuring range is found If any measured value appears on the display although the test probes have not yet been connected to the object this can be attributed to the sensitivity of the measurement input and of no importance 3 Connect the test probes to the measurement object If an appears on the...

Page 6: ... disconnected for approx 15 minutes cool down period 1 Connect the black test cable to the COM jack For measurements in the mA range below 200 mA the red test cable is connected to the VΩmA jack but for measurements greater than 200 mA it is connected to the 10 ADC jack 2 Move the rotary switch to the desired measuring range A If there is any doubt regarding the measuring range start with the larg...

Page 7: ...able to the VΩmA jack 2 Move the rotary switch to the Arrow Symbol function 3 Hold the red test probe against the diode s anode and the black test probe against its cathode Now read off the value for the conducting state voltage values between approx 0 6 V and 3 V depending on diode type The diode blocks the voltage in one direction in the blocked direction you will obtain the value 1 If there is ...

Page 8: ... of mechanical defect To test the individual components further the battery should be in good condition and fully charged If you identify a fault in part of the charging circuit also check all the other components of the circuit for damage 1 1 Charging voltage The charging voltage measurement reveals whether or not the charging circuit is working correctly First warm the engine up Now put the bike...

Page 9: ...oltage stop engine connect test probes across different contacts restart engine measure voltage again and so on If the measured values are the same for all the combinations of contacts as a rule an average motorcycle alternator delivers approx 50 70 volts then the alternator is working correctly If some of the measured values are significantly below the others the alternator is faulty Checking for...

Page 10: ...he rectifier s earth cable and all the alternator connections and also between the positive output cable and all connections in other words reverse the polarity once in each case One direction should produce a lower reading while the other direction should produce a reading that is at least 10 times as high If any of these connections produces the same value in both directions i e despite reversal...

Page 11: ...h select measuring range up to 2 MOhm Hold the red test probe against that stator winding and the black one against the housing earth Unless the resistance measured is infinite there is a short to earth fault Next measure the resistance between all possible combinations of commutator bars on the rotor The measured resistance should always be low a value close to zero indicates a short circuit whil...

Page 12: ...e black box A weak ignition spark may especially with older vehicles be due to a voltage drop in the ignition circuit For safety reasons checking the ignition coils in an electronic ignition system should be left to a professional mechanic to avoid risk of damage to the black box In the case of contact ignition proceed as follows Select the measuring range 20 V DC on the multimeter Undo the positi...

Page 13: ... the two high voltage ignition cables with an ignition coil with ignition cable hold the red test probe against the positive feed and the black test probe against the high voltage ignition cable then compare the measured value with the setpoint value from the workshop manual 2 2 Ignition box Ignition boxes are extremely sensitive components and should only ever be tested by a workshop that has the...

Page 14: ...ts A measured voltage that is lower than this indicates a fault on the feed cable a plug the starter button or a safety switch voltage drop The switches can be tested by disconnecting their cable accesses from the circuit Set the multimeter to measuring range 200 ohms perform continuity test see above hold test probes against the cable accesses and actuate the switch If the measured value is great...

Page 15: ...ing completely disabled whilst less serious damage can more or less noticeably reduce the efficiency of affected consumers such as lights or ignition A simple visual inspection of components is often all that is required green connector tongues and scruffy switch contacts must be scraped or sanded clean and reassembled with a little contact spray Cables with greenish cores should be replaced A cab...

Page 16: ...and disconnect the positive cable from the battery Select the 10 amp measuring range on the multimeter insert the red test cable in the 10 ADC jack and the black one in the COM jack then hold the red test probe against the positive cable and the black test probe against the battery s positive terminal If a current can be measured this indicates that there is a leakage current The source of the lea...

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