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Registered Member #513
Joined: Sat Feb 10 2007, 07:30PM
Location: Pointe-Claire, Quebec, Canada
Posts: 19
I have recently performed an autopsy on my dead CW multiplier. Hoping that only a few of the diodes died, I began checking them with my mm. I am not able to successfully interpret the results. What should be the resistance reading of a hv diode? My average results:
- to anode + to cathode : 100 to 300 kOhms + to anode - to cathode : 0.6 to 3 MegOhm
Registered Member #56
Joined: Thu Feb 09 2006, 05:02AM
Location: Southern Califorina, USA
Posts: 2445
It is hard to test diodes by measuring resistance, as they do not have any resistance by rather a fixed voltage drop. Some meters have a seting that can be used to measure that.
If not, grab a resistor (1k would be fine) and put in in series with a 12v (or w/e) supply. Put the diode in across the resistor/gnd and measure the voltage across it. One way should read about a volt, the other way should read 12v.
If it passes that it is probably good, but it could still be damaged...
Registered Member #190
Joined: Fri Feb 17 2006, 12:00AM
Location:
Posts: 1567
As Jmartis said HV diodes do require higher voltages to get current to flow in the foward direction. Connect a current-limiting resistor in series and increase the voltage and have a current meter in series.
Registered Member #10
Joined: Thu Feb 02 2006, 09:45AM
Location: Bunbury, Australia
Posts: 1424
You also need to uderstand why you blew the CW muliplier or you will do it again. I use a resistive load in series with any sparks. Also you need to be sure you are using appropriately rated diodes. If you are runing from 1kV AC you need diodes rated at minimum 2.8kV. Like a microwave oven has 2kVAC and uses 11kV rated diodes. What are the details of your multiplier and driving voltage?
Registered Member #513
Joined: Sat Feb 10 2007, 07:30PM
Location: Pointe-Claire, Quebec, Canada
Posts: 19
... : Thanks alot!. I tried this method and it seems to work. Only surprising thing is that in all of the diode ( 40 total) only 4 or 5 are dead. Would this dramatically affect the performance of a 10 stage CW multiplier? I will try putting it back together without the dead ones (less stages) and see the results.
Tesladownunder : thanks for your reply. All the details of the multiplier are in this post :
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Question about Checking HV Diodes
