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MULTIMETER VC333 SCH

METER - SERVICE MANUAL
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METER
SERVICE MANUAL
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  • Also known:
    MULTIMETER VC-333 VC333 VC 333
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Relevant METER forum topics:
MESTEK DM100C multiméter forgókapcsoló
Sziasztok!

Segítséget szeretnék kérni a szóbanforgó kínai muntiméterrel kapcsolatban. A csipogóját szerették volna elnémítani, mivel a méréshatár váltásokkor minden tekerésre idegesítően csipog benne a buzzer. Szétszedéskor széthullottak a kapcsolóban lévő réz érintkezők. Addíg sikerült hosszas kísérletezgetéssel eljutnom, hogy a helyére kerültek a mérendő dolgok, ám a kikapcsolás csak látszólag  történik meg mivel az áramfelvétele felugrik 480mA-re. (Működés közben csupán 43mA a felvett áram) 
A lemezeknek még nem ez a megfelelő helyzete. Lenne valami ötletetek miként lehetne a helyére rakni öket?

Köszönettel: gapati

BUÉK Mindenkinek!
 
Multiméter vásárlás. Milyet érdemes?
Sziasztok! Új multimétert szeretnék vásárolni, a kiszemelt egy Maxwell Mx-25302. Mennyire jó ez a multiméter? Megéri megvenni? Esetleg tudtok jobbat ajánlani ebben az árkategóriában, akár használtan is? Előre is köszönöm a segítséget!
UT81B UNI-T Oszcilloszkóp digitális multiméter
Sziasztok! Érdeklődöm tisztelettel, van valakinek ilyen műszere: UT81B UNI-T Oszcilloszkóp digitális multiméter. Ha van, akkor meg ér-e 40 000.- Ft-ot. Köszi. Üdv. Gyuri
Looking for Metrix MX53 Multimeter schematic
Hi there,
After many years of good services, I made a mistake while measuring UHV (ultra high voltagel with my  METRIX MX53) . I was measuring a voltage around 2500V DC with all the safety required, using a divider, to get only 1/50th of the voltage as I did many times.
But for some unknown reasons (I'm rarely distracted when playing with such letal voltage) , I didn't connect my clip at the divider but at the full voltage. 
You understand that the MX53 didn't appreciate it. 
I opened the multimeter, which is kind of sport as not as easy as it looks and found a resistor R1 (may be 200 ohms 5%, hard to read) completely exploded. I replaced it. I also found that 2 of the four varistors were shorted, changed them, I checked all the transistors, mostly SMD, but they all look fine as far as I can see. However, the multimeter is still not responding. 
I have also found 2 SMD diodes that could also be shorted and need to check them more thoroughly... 
I have very few chances to fix the meter but if I could put my hand on its schematic, It would be easier to track down the culprit, hoping it's not the proprietary chip in it. 
So, if someone have (or could lead me to a link to it) the circuit drawing of the MX53, preferably, or the MX52 or MX54 which look close to it, just a few functions more and the PCB looks common to both as the MX53 has some locations not populated with components, it would help me to try to save my old companion! 
Thanks in advance, any help much appreciated.!
Nota: METRIX is a French company, was also know as Chauvin-Arnoux.
Regards from France...! 
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