My problem is that the multimeter is not functioning properly on ACA function..
i've placed the instrument in series with an 6.3VAC 50Hz source and the load.. but i don't get a thing!!!
then i tried to measure the current drawing of an electric fan from the mains and i got that it draws about 0.4A at 220VAC then again i went back to my previous test and still nothing! and now i can't even measure the electric fan!!!!
what's wrong? should i take the multimeter back to where i bought it?
is it possible that i'm doing something wrong?! or the instrument is damaged?? i'm very frustrated because i bought that mastech thing specifically so i can measure AC current!!!
Are you sure there's actually current going through it? And why 6.3VAC out of curiosity. I have a Mastech meter myself I'm not real pleased with it, because the inductance and capactiance measuring features don't work properly, but as far as a general meter goes it's fine.
If the filaments don't light, then it sounds like the meter fuse is blown. You should use the 10A inputs for the filament measurement. The filaments likely draw more than the fuse rating.
If the filaments don't light, then it sounds like the meter fuse is blown. You should use the 10A inputs for the filament measurement. The filaments likely draw more than the fuse rating.
Both ports on that meter should be fused. Check them. I have an MS8222H, selling a meter with a 10 amp current measure mode that doesn't have a fuse would be stupid. My meter is basically the exact same as yours only mine has an inductor and capacitor testing ability. Mine does have some nice easy to remove 'screws' on the battery door that eagerly shows the fuses.
I'd return the meter, if nothing is obviously damaged then there may have been a spike that damaged the amplifier circuit that reads the voltage from the shunt resistor on the unfused line.
Iif nothing is obviously damaged then there may have been a spike that damaged the amplifier circuit that reads the voltage from the shunt resistor on the unfused line.
first tried to measure how much current draws from the mains a 12VDC stabilized power supply..
using the 10A unfused port it blew the 200mA/250V fuse!!!
after i replaced the fuse i tried between the 12VDC power supply output and a small 12V graphics card fan...the fan spins both on ACA function and on DCA function..but on DCA i see "1" which i think it means out of range and on ACA i see "0.32"!
tested it on 10A unfused port with a 12VDC power supply and a small 12V graphics card fan...the fan spins both on ACA function and on DCA function..but on DCA i see "1" which i think it means out of range and on ACA i see "0.32"
i got another multimeter the same model... and i have exactly the
same problem!!!
i don't know what i did wrong (if i did something wrong...)
here's a photo of the inside of the multimeter there are few ICs one
is an HEF4011b the other says something 062C/EZ805 (probably it's an TL62 op-amp..) and there is also a COB which i guess it is the LCD controller and the other one i don't know what it is...probably it's a custom made Ic.
can somebody tell me which one can be responsible for the problem?