Ac & Dc Multimeter Design....

[alzhrani]

multimeter design


Hi , Everybody

i want to design multimeter Ac & Dc

colud any one help me in this design


now i have dc design but i need circuit design for ac

if you attach a circuit it will be better


thanks,,,,,,,,

 

[jpacosta]

multimeter ic

Hi alzhrani
the ic ICL7107xx can be a beginning
jpacosta

 

[alzhrani]

design a multimeter

thankyou : jpacosta for your fast ansuring

can you please help me for interfacing 220 V ac to this IC

 

[alzhrani]

digital multimeter design

any one help me

 

[unkarc]

how to design a multimeter

Hi,

Here is link to see a multimeter kit description with ICL7106 :

**broken link removed** from here:

**broken link removed**

I think it would be useful for you to see another solution too:

**broken link removed**

To understand the basic principles of making a NOT digital multimeter:

http://www.allaboutcircuits.com/vol_6/chpt_3/11.html for DC and

http://www.allaboutcircuits.com/vol_2/chpt_12/1.html for AC voltages etc.

To answer your question of interfacing 220V AC to an IC input, usually a voltage divider is used as you can see in Fig. 3, page 4 of the m-2666k.pdf from the first link. The resultant resistor value of the several resistors connected in series in the divider gives 10 MegaOhm as a rule, this is called input resistance of a multimeter.

You can find many other details on the web by using google.com or/and reading textbooks on measurement technics. I did some homework for you...

Regards
unkarc