Electronics > Projects, Designs, and Technical Stuff
UT61E vs Ionizer
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hgg:
Hi,

This was my first try to make a 15 stage ionizer and I had the brilliant
idea to use my UT61E to debug it.  A probe on the wrong component
and after a tiny flash the UT61E was zapped to oblivion...  |O  I don't care
about the meter itself as much as the work I've done for all the upgrades
it has.  So any help would be much appreciated! 

The Killer :


The "new" selection modes after the zapping :





I've tried to see if there was anything obvious on the board but there is not.
If you look at the photo below diodes D5 & D6 measure dead short in either direction
and the double diode D4 has a voltage drop of 0.1V in either direction as well.
(meter was in off position).

Is this normal?  Looks like that these diodes are dead.  What do you think?
The meter works correctly only in capacitance and Amperes mode.

I hope there was no damage on the main chip ES51922.
Can you please help me track down the problem?
Thank you!




Schematic :




001:
Nice photos  :palm:

Check Q5&Q6 and MOVs

Use 990M resistor serial  with Your meter next time and multiply readings x10
Wolfgang:
I would say its time to say farewell. R.I.P, Uni-T >:D. Maybe a 87V next time
joeqsmith:
There isn't much to these meters.  The fact that the FC pins are no longer working tells me the main IC has a problem.  It may be difficult to source a replacement.   

I've damaged a few of these.  They are not the most robust of meters.  Actually, pretty low on the scale compared with the others I have looked at.   Still, hard to say if a top of the line meter would have survived the same mistake. 
hgg:
Indeed they are not, although the applied voltage was many KV.
D5 and D6 are actually ok.  There is a 9 Ohms resistor across.

I removed the switching double diode D4 and one of the internal
diodes was shorted.  Maybe there is a chance that the IC survived.

I will order a replacement diode and see what happens.   
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