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Making Digital Multimeter

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nicko-391

nicko-391

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Want helps

I want to build multimeter which can measure V,I,R,C etc.I hope to use PIC,ADC...But i have nt clear idea about how Current is measured ,how maintain autoranges..please give me some ideas,directions to do this project.
 
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current can be measured with a shunt resister, and for autorange you can use analog switches starting from high level to low level
 
can u explain how to implement the R ladder for auto range?
 

Re: Want helps to make Digital Multimeter

nicko-391 said:
I want to build multimeter which can measure V,I,R,C etc.I hope to use PIC,ADC...But i have nt clear idea about how Current is measured ,how maintain autoranges..please give me some ideas,directions to do this project.
Click to expand...

It's called Superprobe and it's not a digital multimeter (logic pulser, frequency counter, voltmeter, capacitance meter, signal generator and serial ASCII data output) but it's going to give you some idea ... check it out :

http://www.benryves.com/journal/3632205

and the C source code :

http://www.benryves.com/bin/superprobe/superprobe.zip
 
Re: Want helps to make Digital Multimeter

I cheked it out.It suit for my project.How can I buy this IC? It is not in e-bay.I coudnt found any distributor.
 

Another good one here "Mega Meter" :


http://members.shaw.ca/Botgoodies2/MegaMeter/MegaMeter.htm
 
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