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Registered Member #1051
Joined: Tue Oct 09 2007, 06:23PM
Location: Montreal
Posts: 3
I have plenty of power supplies for ozone application. I need to Identify them with voltage, amps and power. I know there is at least 2 kV at the output, but I don't have any measurement equipment that can withstand that kind of high voltage. My question is: is there any way I can measure the output, if yes, how? Also, we all know that when we multiply voltage with amps, we got power. Is it always right, does it work for high voltage switching power supply? Is it the real power (W) or apparent power (VA). Finally what Can I use to measure power on a high voltage SMPS.
Registered Member #32
Joined: Sat Feb 04 2006, 08:58AM
Location: Australia
Posts: 549
Cheap multimeters that are rated to 1kV are not hard to come by. By sticking enough series resistance in, these can be used to measure higher voltages.
For example, if the input impedance of a meter is 1M (as read from the specs), putting 9M in series with this will let you use it to measure up to 10kV (usual voltage divider stuff).
Remember that this doesn't magically improve the ratings of the leads, so don't use this like a regular meter. Also, of course, your resistors you use have to be able to take the voltage, as well.
Account deactivated by user request on 6/11/2009. Registered Member #1071
Joined: Fri Oct 19 2007, 02:13AM
Location:
Posts: 44
An easy way is to just make a voltage divider. You can make it out of regular resistors, you just have to use a bunch of them in series so that the voltage drop across each one is small. So if you wanted a divide by 10 you could use like 9 100k resistors in series on one side to positive and 1 100k on the other side to ground. Then you can just measure across the 1 resistor and multiply the number you get by 10 to know the actual voltage (sorry if that was boringly obvious).
I have never tried to measure the current output of any kind of DC supply before. I usually work with pulsed type stuff so you can just use a Pearson or Rogowski coil.
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High Voltage Measurement
