Products > Test Equipment
100:1 probe for measuring ripple in a tube amp power supply
2N3055:
--- Quote from: tggzzz on January 30, 2019, 03:36:30 pm ---
... except those that are 1000:1 passive probes, e.g.
http://w140.com/tekwiki/wiki/P6013
http://w140.com/tekwiki/wiki/P6015
Note that those do have the full potential divider inside the probe (i.e. don't rely on the scope's 1Mohm input resistance), so they can safely be used with the scope internally AC coupled.
--- End quote ---
Sorry, I meant to relay that they won't be 10:1 or 1:1 probes..
But we are digressing.
OP asked how to measure ripple on top for 300-500V power supply. Way to do it (with common scopes that are widespread today) is to have a probing solution that will decouple DC in a safe manner and won't attenuate AC. Also you want to highpass filter it so anything less than 10-20 Hz doesn't mess up measurements.
In a book I quoted there is a good chapter on topic.
David Hess:
And except those old proper Tektronix x100 passive probes:
http://w140.com/tekwiki/wiki/P6007
http://w140.com/tekwiki/wiki/P6009
Which are safe to use with any coupling up to 1.5 kilovolts because they also include an internal divider.
cvanc:
What am I missing here? Wouldn't measuring it with a meter be both easier and more repeatable?
rf-loop:
--- Quote from: cvanc on January 30, 2019, 05:30:29 pm ---What am I missing here? Wouldn't measuring it with a meter be both easier and more repeatable?
--- End quote ---
You have missed OP's first message in this thread. ;)
eliocor:
Take a look at the whole application note AN118:
https://www.analog.com/media/en/technical-documentation/application-notes/AN118fb.pdf
lots of suggestions on how to measure ripple voltages and noise on HV power supplies.
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