Aneng dt 9205a dvm

[barry wilkins]

Has anybody got the circuit for this meter ?

Thanks

Barry

[stj]

Re: Aneng dt 9205a dvm

what chip does it use?
dtm0660?
dm1106?

[barry wilkins]

Re: Aneng dt 9205a dvm

Hi cant tell what the chip is attached a picture .
I know this was quite cheap ,bought it from Amazon because I had blown workshop one on some Ferrus power supplies, in fact its not bad just a bit low on all readings,when I compare it with my best meter which is accurate.
Just would like to increase the counts which will make it bit better.

If you see my other post ,I found a resistor O/C on the Maxcom ,so got lots of meters now 8 or 9 .
3 scopes.
Barry

[barry wilkins]

Re: Aneng dt 9205a dvm

dont know what happened with the picture

[stj]

Re: Aneng dt 9205a dvm

i dont think you can increase the count if it doesnt use one of the chips i listed,
are either of the 8pin chips a 24c02 eeprom?

[barry wilkins]

Re: Aneng dt 9205a dvm

Hi I did find some info on line ,which I did not think was correct . It showed a circuit with 7106 IC.
I wiil take a look next week.

Barry

[stj]

Re: Aneng dt 9205a dvm

it's not the old icl chip - the tracks dont fit the schematic.

[barry wilkins]

Re: Aneng dt 9205a dvm

It might be the new chip which has 44 pins
R34 is connected to pin 39 (100K) reducing by padding this with 10M has brought up the reading .Its slightly high now .
One of those tiny pots would be nice ,but have never found them anywhere.
I have got some SM 10M resistors left over from a scope repair ,so I will fit one of them.

Barry

[stj]

Re: Aneng dt 9205a dvm

i have those pots - they come from ali express.
https://www.aliexpress.com/item/32843902104.html

if your in a pinch, you can find them on cd/dvd laser assembly's