I don't have the second channel on. I am reading this with only the channel 1 probe hooked up. I now have a relatively stable wave form at 2 volts/division and 1us/division. But the waveform is to the extreme right of the screen, and the horizontal position knob will not let me move it to the left.
I don't understand what the channel 2 probe would be reading. I'll go back to Mark's abstract and re-read what it says about it. But I thought he said you could get a reading with just one channel.
Thanks,
John
I don't understand what the channel 2 probe would be reading. I'll go back to Mark's abstract and re-read what it says about it. But I thought he said you could get a reading with just one channel.
Thanks,
John
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Ok, I see the way it should be set up with two probes under the heading "Triggering The Oscilloscope". I think the second probe provided with the Hantek scope is a high voltage probe. Let me think about I can make this work.
Thanks,
John
Thanks,
John
Okay, I set up everything again, after reading every write up from @Mark Johnson and now it really works without issues - lession learned: RTFM! And with this correct setup I get 33,1 ohms for the Toroidy TTSA0020 with shorted 230 VAC primary and 2x15 VAC secondaries, one of them shorted (caps 150 nF/10 nF).
Setup is: trigger set to - 2 volts (the minimum possible value) and falling edge, T 1 us.
Could someone please tell if it is correct, based on the graphs? Many thanks in advance.
Setup is: trigger set to - 2 volts (the minimum possible value) and falling edge, T 1 us.
Could someone please tell if it is correct, based on the graphs? Many thanks in advance.
Istvan, did you use 1 probe/channel or 2 probes/channels on your scope to get these results? I am going to order a second probe because I now understand how to hook it up. Not so sure about how to use one probe to both trigger and display the waveform.
John
John, I have only 1 probe, so followed Mark's recommendation for this case.
With one probe, you should make proper settings and I think you could use my settings. Probe to the Quasimodo scope pin, trigger of the scope at -4 volts (my limit is -2 volts but it works too) and falling edge, time 1 us, channel voltage range 2 volts, sensor and scope sensitivity must be the same.
Remove the trim pot, turn the Quasi on and you should get a ringing sinusoid thingie. Play with the voltage until the graph is similar to mine, but let the time at 1-2 us. Put in the trim pot without changing the settings (you can see, my settings are identical before and after) and turn it until you get just one bump. I set my trim pot to about 15 ohms before putting it in.
With one probe, you should make proper settings and I think you could use my settings. Probe to the Quasimodo scope pin, trigger of the scope at -4 volts (my limit is -2 volts but it works too) and falling edge, time 1 us, channel voltage range 2 volts, sensor and scope sensitivity must be the same.
Remove the trim pot, turn the Quasi on and you should get a ringing sinusoid thingie. Play with the voltage until the graph is similar to mine, but let the time at 1-2 us. Put in the trim pot without changing the settings (you can see, my settings are identical before and after) and turn it until you get just one bump. I set my trim pot to about 15 ohms before putting it in.
This test set-up uses two channels and two probes for the best capture. One probe sends the signal to channel 1, the second probe sends the trigger signal to channel 1 (you must set the trigger to pickup on channel two since the lead will be connected to channel two). I believe there is a method for only one probe, but I have never tried it.
RickRay,
I know it can work with one probe because I had it working....but I lost the plot by not paying attention to the settings. But you are right, the best way to do it per Mark's abstract is to use 2 probes. I can buy a second Hantek probe for less than $10 on Amazon. I'm interested enough in this topic to get the second probe and experiment with it to get the best capture possible.
Thank you for the help,
John
I know it can work with one probe because I had it working....but I lost the plot by not paying attention to the settings. But you are right, the best way to do it per Mark's abstract is to use 2 probes. I can buy a second Hantek probe for less than $10 on Amazon. I'm interested enough in this topic to get the second probe and experiment with it to get the best capture possible.
Thank you for the help,
John