Simple, no-math transformer snubber using Quasimodo test-jig

[jackinnj]

Ok, after twirling the controls on my Hantek DSO2D15 I get what I think are reasonable wave forms. I have a pair of Antek-0218 transformers that I intend to use in a balanced Zen Mod Preamp yet to be built. These are 25 VA transformers with dual 18 V secondaries. I am getting a Rs reading of about 24 ohms on one of the transformers and 88 ohms on the second transformer. This seems to me to be too big of a difference.

I am using one probe and triggering on the falling edge. Does it make sense that the two transformers could measure that differently? The pictures below show one transformer with R5 trimmer out of the circuit and then in circuit. Both secondaries on both transformers measure close to each other, but the difference between the two transformers is making me wonder.....

John

There should be a “delay trigger” function on your scope so that you can see the entire ripple as it dissipates

 

[jminassi]

I'll check out the delay function. That would be a useful feature.

Thanks

 

[Mark Johnson]

Jack, on digital scopes like the DSO2D15 you simply twirl the horizontal position knob. The digitized waveform data is stored in (digital) memory, and the horizontal position knob just slides the display window left and right across the stored data.

The trigger delay function of old analog CRT scopes, is effectively superseded by very deep waveform memory + horizontal position knob in current day digital scopes.