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DT830x Multimeter Circuit Diagram

#2
In all likelihood it contains a custom chip that performs most of the functions and it's very unlikely you'll find a circuit diagram.

Can i ask why you want one?
 

mvs sarma

Well-Known Member
#6
nice that you have the concerned sch. Once the switch is placed on DC V and concerned range, you can always measure. If switch is faulty , Concerned pins can be shorted and permanently it becomes a DC DVM OR AC depending on which one you selected.

what is it you wanted to know?
the link below has many such diagrams , perhaps many dmms sch are loaded.
https://www.google.co.in/search?q=d..._pw.r_qf.&fp=f34040524b906f93&biw=960&bih=613
 
Last edited:

mvs sarma

Well-Known Member
#8
better NOT to.
now a days Modern DMMs are coming with all SM<Ds .
Use of such modules for continuous measurement of AC ( with fluctuations ) might reuslt in damage to the module as many smd resistors might blow off.
 
Thread starter #9
better NOT to.
now a days Modern DMMs are coming with all SM<Ds .
Use of such modules for continuous measurement of AC ( with fluctuations ) might reuslt in damage to the module as many smd resistors might blow off.
so, i think it will at least work well if i can reproduce it. I'm not getting any other suitable circuit for this part.
 
#14
This IC is not for converting AC to DC.
It is for lighting up the display (LCD or LED) displaying the voltage it reads.

The AC to DC conversion is done by the far left 1N4007 diode (in the schematic).
 

mvs sarma

Well-Known Member
#17
you get a ready module cheaply, may be you like LED panel meters for AC voltage measurement. and waht to experience making one from scratch.
secondly
there are some elektor designs of previous decades for dpm modules with LCD glass. it would consume less.
 
Thread starter #18
you get a ready module cheaply, may be you like LED panel meters for AC voltage measurement. and waht to experience making one from scratch.
secondly
there are some elektor designs of previous decades for dpm modules with LCD glass. it would consume less.
Right, i'm going to try doing this using the DT930. But, will have to remove the extra components from it, it will be a pain though.
 

mvs sarma

Well-Known Member
#20
Right, i'm going to try doing this using the DT930. But, will have to remove the extra components from it, it will be a pain though.
why should you remove other components?
Just remove the rotary switch
imagine which locations are to be connected , say for 230V AC or 750V AC range
solder them accordingly
close the round hole by some decorative , your AC voltmeter is ready !!!
 

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