MULTI MEASURING INSTRUMENTS MCL-550D Instruction Manual Download Page 7

 
 
 
 
 
 
4-4. Measurement of Diode 
 

  Set the power switch to "ON" position.   

  Connect the plug of red test lead into the “   

” terminal and the plug of black   

test lead into the “COM” terminal. 

  Set the range selector switch to “   

” range. 

  Contact the tips of the test leads to the diode under test. 

 
 
 
 
 
 
 
 
 

                                   

      Fig. 4 

 

 
    As  shown  in  Fig.4  (a),  when  measuring  the  forward  voltage  across  the  diode,  a 

normal diode will indicate 0.4 to 0.7V and, as shown in Fig.4 (b) the reverse voltage 
will indicate a value near 1.500(battery voltage). For a short-circuited diode, a value 
near 0mV will be displayed. 

 

                                                                                                                                   

 

!

CAUTION 
Be sure all voltage is turned OFF in the circuit before making diode test.   

 
 
5. REPLACEMENT OF BATTERIES     
 

   

When  the  battery  voltage  falls  below  a  specified  voltage  value,  the  "B"  mark  will 

appear  in  the  display.  If  this  occurs,  replace  the  two  batteries  with  new  ones  as 
quickly as possible.   
Turn the power switch to "OFF", prior   
to installing batteries. 

    To install the batteries, remove the   

battery cover located on the unit back. 

    Loosen the screw on the battery cover. 
    Replace the two batteries (UM-4 or   

type AAA) with new ones, observing   
polarity. Use high-quality batteries   
which are guaranteed against leakage.   
If the instrument is to be left unused   
for long periods of time, to prevent   
damage from leakage, remove the batteries. 
 

Summary of Contents for MCL-550D

Page 1: ...anical electronic design Before you use your new instrument read this Instruction Manual completely and familiarize yourself thoroughly with all functions Keep this manual carefully to take out whenev...

Page 2: ...operations WARNING POSSIBLE ELECTRICAL SHOCK This instrument is for the use of low voltage circuit Do not make measurements in the circuit more than AC 600V Before use check and confirm the voltage o...

Page 3: ...f mode approx 10 minutes after the power switch on Operating temperature 0 to 40 80 RH non condensing Strange temperature 10 to 60 70 RH non condensing Power supply 1 5V AAA size R03 x2 Power consumpt...

Page 4: ...where it is difficult to see the readings use the data hold switch Fig 1 Note Clamp around only one conductor of the circuit to be measured See Fig 1 When making the clamp measurements for high AC cur...

Page 5: ...tion Connect the plug of red test lead into the V terminal and the plug of black test lead into the COM terminal Set the range selector switch to ACV range Contact the tips of the test leads to the ci...

Page 6: ...to rain or moisture Do not operate the tester in the presence of flammable gases or fumes CAUTION To avoid damage to the tester disconnect test leads before changing functions Do not exceed the maximu...

Page 7: ...e displayed CAUTION Be sure all voltage is turned OFF in the circuit before making diode test 5 REPLACEMENT OF BATTERIES When the battery voltage falls below a specified voltage value the B mark will...

Page 8: ...ent out from our factory after the sufficient internal inspections but if you find any defect due to the fault in our workmanship or the original parts please contact the dealer where you bought the i...

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