OK, TomC take your time that you are needing and I am here to measure whatever you want.
I prepare a work about AZ1094 circuit...it has a lot of interesting!That'll be interesting!
Your PSU board is different from mine, so I attached images of where I think it'll be easiest to hook up the probes. CH1 should be on D8's anode, and CH2 on Q1's drain. Both ground leads to the Z-plate. Make sure the probes are set to X10 because the peak voltage at Q1's drain may be more than 400V with 230VAC mains. While the scope is running you'll see an image like #1, jumping up and down. When the baseline of the CH2 trace is level with the ground marker it is as closely referenced to the Z-plate ground as you can get. To get a capture like #2 I used single trigger. Sometimes the baseline will be at the correct place, so when this happens I capture the image.
TomC, thanks for helping...
Here it is what you ask.
The pin6 is enable pin, Owon just connect with Vin, typical and evaluate schematic set a 1nF decoupling capacitor. I believe that this must adding.
The pin7 & 8 are joined together. From this point Owon puts the D127 to gnd and through the L3 inductor with 3 caps parallel, C36/5uF, C45/12uF and C44/470uF.
This way differs some from evaluate schematic. At the evaluate schematic there is RC parallel to D127 and at the output there are two electr. caps of 22uF. I think that needs 1uF smd parallel to diode. The output needs more investigation with two inductors or pi filters.
at the second there is a 10uH inductor like Owon does by hand.
The result at the second captures is worst and I don't know who from Owon thinking that solution!
OK, TomC take your time that you are needing and I am here to measure whatever you want.
I prepare a work about AZ1094 circuit...it has a lot of interesting!That'll be interesting!
Your PSU board is different from mine, so I attached images of where I think it'll be easiest to hook up the probes. CH1 should be on D8's anode, and CH2 on Q1's drain. Both ground leads to the Z-plate. Make sure the probes are set to X10 because the peak voltage at Q1's drain may be more than 400V with 230VAC mains. While the scope is running you'll see an image like #1, jumping up and down. When the baseline of the CH2 trace is level with the ground marker it is as closely referenced to the Z-plate ground as you can get. To get a capture like #2 I used single trigger. Sometimes the baseline will be at the correct place, so when this happens I capture the image.
TomC, thanks for helping...
Here it is what you ask.Thanks a lot for these captures!
They answer some questions I've been wondering about, and pose some new ones!
New question --- The frequency of your 8.4V converter is about 62.6KHz at 230VAC. Compared to the frequency change on mine as the mains voltage was increasing (frequency decreasing as voltage increased), it seems that your PSU stays close to the 65KHz programmed frequency. Why? Is this because of a difference between the R7731N and the R7731A? Is it because my R7731A is flaky? Maybe I can find the answer when I test my old PSU......
Answered question --- The peak voltage at Q1's drain is about 462V. Q1's breakdown voltage is 600V. It seems that the designers allowed a fair safety margin.
A reminder to SDS series users:
The scope's maximum input voltage spec is 400V. While testing voltages in excess of this spec you should insure the probe is set to X10 to protect the scope's input. Also remember that the supplied probes have a maximum rating of 600V. If you need to test anything higher you should use a high voltage probe.
at the second there is a 10uH inductor like Owon does by hand.
The result at the second captures is worst and I don't know who from Owon thinking that solution!It seems like the inductor is forming a resonant circuit with stray capacitance, causing all the extra noise you see on the captured image. Perhaps adding an appropriate capacitor in pi arrangement (as you mention in next post) may stop the ringing and give better noise results.
About the maximum input voltage. I don't remember well but I think that the maximum of 400V is the adding of ac/dc components of singal and peak to peak not rms or average.
Please, if someone has measured the values of smd capacitors C45, C40, C41 from the adapter board Ver. 3.2 or 3.3 it''ll be very appreciated. They are next to L2 & L3 5R6 inductors.
Tomorrow I could measure all them by separately. Well, not the most smaller, because I've lost it.
Tomorrow I could measure all them by separately. Well, not the most smaller, because I've lost it.
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The pin7 & 8 are joined together. From this point Owon puts the D127 to gnd and through the L3 inductor with 3 caps parallel, C36/5uF, C45/12uF and C44/470uF.
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Please, if someone has measured the values of smd capacitors C45, C40, C41 from the adapter board Ver. 3.2 or 3.3 it''ll be very appreciated. They are next to L2 & L3 5R6 inductors.
Carrington for version 3.0 I have measured these little smd capacitors next to L2 (I unsoldered all of them), see at a quote of my previous message. I need the values for version 3.2/3.3 if it is possible.
About EMI: I don't know anything of the new boards, Aidetek is not responding to my messages, and my adapter board V3.0 is damaged. So I could not try anything.
Please, if someone has measured the values of smd capacitors C45, C40, C41 from the adapter board Ver. 3.2 or 3.3 it''ll be very appreciated. They are next to L2 & L3 5R6 inductors.
C45=C41=10uF
C40=100nF
Edit: This cap are from the adapter board Ver. 3.0.
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Hi! I need a simple test of the scope, to see if it's just me or if this thing that's happening to me is normal.
So can anyone please set the scope to X-Y mode, invert one of the channels and report if that makes any difference to what's seen on screen in the X-Y mode? On my scope, it looks like channel inversion isn't working in X-Y mode and is fine in voltage-time mode.
Hi! I need a simple test of the scope, to see if it's just me or if this thing that's happening to me is normal.
So can anyone please set the scope to X-Y mode, invert one of the channels and report if that makes any difference to what's seen on screen in the X-Y mode? On my scope, it looks like channel inversion isn't working in X-Y mode and is fine in voltage-time mode.
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There is coming some new, and I think, Owon have also learned something.
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