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I had thought of using my oscilloscope with a suitable HV probe to measure the voltage but it makes me nervous connecting my oscilloscope to a flyback output because I don't really know what the maximum voltage is and I may guess wrong on the probe maximum voltage capability.
but this one is very easy - wind your own primary with say 30 turns, connect function (sin) gen to the secondary, measure transformation coefficient on something like around 2-5 khz, you will get number about 50 i think. then on every volt of primary drive you will get around 50 v from the secondary, less actually. there's no need to apply full 150/300 v to the primary - apply 10, then measure and calculate what you will get at the full drive. coz when driven right a transformer is a linear device.
Registered Member #62119
Joined: Sun Feb 04 2018, 04:59AM
Location: Cedar Rapids, Iowa
Posts: 136
father dest wrote ...
MRMILSTAR wrote ...
I had thought of using my oscilloscope with a suitable HV probe to measure the voltage but it makes me nervous connecting my oscilloscope to a flyback output because I don't really know what the maximum voltage is and I may guess wrong on the probe maximum voltage capability.
but this one is very easy - wind your own primary with say 30 turns, connect function (sin) gen to the secondary, measure transformation coefficient on something like around 2-5 khz, you will get number about 50 i think. then on every volt of primary drive you will get around 50 v from the secondary, less actually. there's no need to apply full 150/300 v to the primary - apply 10, then measure and calculate what you will get at the full drive. coz when driven right a transformer is a linear device.
I like the sound of this measurement technique. I will try this method. Thanks.
Registered Member #2431
Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
dont try to figure out an "effective" turns ratio. thats not how flybacks or ignition coils work. their output is wildly dependent on frequency, duration and rise fall times of a given pulse.
Do you really need a waveform ? or just need to know more about the feeding spark gap breakdown conditions ?
I think the better thing to do in your case is to by a USB oscilloscope and connect a few CW stages then use a voltage divider to divide down to a conventional o-scope probe. Once you have pulsing DC even at a high frequency, lowering the magnitude of change (Cap ripple) the HV DC can be read from a well made temporary voltage divider.
hardest and worst is to measure Square wave AC with huge rates of rise and fall, huge magnitude in V and high impedance with low burden current. Step away from one or more of these factors and measurement gets alot easier.
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How to measure voltage output of AC flyback transformer
