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Blown SMD Resistor In Digital Multimeter
While working on equipment by mistake I have measured DC 320v on main filter capacitor while my range selector of multimeter was on Diode testing mode.
Screen of the meter flickered and I come to know that I have did something wrong. While checked the position of selection knob I realize what I did I have measured the Dc voltage on Ohm Range and spoiled the meter for confirm I have short two probes of meter for continuity there is no movement of digits on the screen so for confirmation of other section I have tested AC and Dc voltages both are worked well. So concluded the problem is with resistance range only. (I had made this mistake before also with my analog Meter Checked 320V DC while selection knob was on ohm range and was damaged since then I kept analog meter beside and brought this Digital Meter.)
Now no choice beside to get new Meter, so I have kept the equipment as it is and phoned to my parts vendor but he was not picking up the phone I was helpless because that day is Thursday and shops in that area remain weekly closed.
So I have decided to open and at least see in side if I can do something. So I have opened the meter for visual inspection. Selector strips all are Ok no burn marks and all the parts are look ok.
For reconfirming the inspection I took my magnifier glass and started re checking the unit I found one resistor Marked R16 looks doubtful under the magnifier glass.
Marking on the resistor is not readable so I have googled and found this resistor is of 1.3kΩ I am not having this value of resistor with me in my parts box I have decide to try with some nearby value I have arranged 1K ¼ watt resistor.
Removed this SMD resistor and soldered this carbon film resistor on its place
Now it’s time to test the multimeter ……………….
Test on diode range by shorting two probes I got the continuity & Beep……………………….resistance testing also done.
Tested 27Ω Resistor reads perfect. So now it is time to get back to the work!!!!!!
This article was prepared for you by Yogesh Panchal who works as a Computer Hardware Engineer in Mumbai India.
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