Author Topic: UD 2.7c "sawtooth" output  (Read 6878 times)

Offline Felix M.

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Re: UD 2.7c "sawtooth" output
« Reply #20 on: July 25, 2023, 08:03:46 PM »
That's the driver. It's powered by 24VAC. For "dry tests" the ODC is removed and the feedback is hooked up to the function generator.


I'm not too sure which jumper do you mean. Is it J4 or J6? J4 is open and the middle and lower pins are connected together for J6.

Offline Late

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Re: UD 2.7c "sawtooth" output
« Reply #21 on: July 25, 2023, 08:10:44 PM »
I'm not too sure which jumper do you mean. Is it J4 or J6? J4 is open and the middle and lower pins are connected together for J6.
On the jumper J6 pins 1, 3 and 2, 4 or 3, 5 and 4, 6 have to be connected together.

In the pic it doesn't look like they are connected together.
Hi, my name is Patriks and I'm from Latvia. I'm interesting electronics, especially power electronics and high voltage. I also make content on YouTube showing my journey in the awesome world of High Voltage.

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Offline Late

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Re: UD 2.7c "sawtooth" output
« Reply #22 on: July 25, 2023, 08:18:14 PM »
That's the driver. It's powered by 24VAC. For "dry tests" the ODC is removed and the feedback is hooked up to the function generator.


I'm not too sure which jumper do you mean. Is it J4 or J6? J4 is open and the middle and lower pins are connected together for J6.

Also i don't see any interrupter signal being fed in. Are you feeding in any for your dry tests?

Looking at the previously sent waveforms i suspect there's something wrong with the ultra fast comparator or some connection near it. Do you have another comparator you could put in to check of that is the issue?
Hi, my name is Patriks and I'm from Latvia. I'm interesting electronics, especially power electronics and high voltage. I also make content on YouTube showing my journey in the awesome world of High Voltage.

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Offline Felix M.

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Re: UD 2.7c "sawtooth" output
« Reply #23 on: July 25, 2023, 08:25:34 PM »
Yes, I forgot to mention it. The interrupter signal is fed in by a fiberoptic cable. I'm going to buy some new comparators soon to check if it makes any difference bun I'm quite sure it was the scope all the time.

Offline Late

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Re: UD 2.7c "sawtooth" output
« Reply #24 on: July 25, 2023, 08:27:06 PM »
Yes, I forgot to mention it. The interrupter signal is fed in by a fiberoptic cable. I'm going to buy some new comparators soon to check if it makes any difference bun I'm quite sure it was the scope all the time.

How is the scope connected to the circuit and is the probe set to 10X or 1X?
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Offline Felix M.

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Re: UD 2.7c "sawtooth" output
« Reply #25 on: July 25, 2023, 08:38:37 PM »
The probe is set to x1. I'm not too sure if it's a good thing but the circuit is floating due to the ringcore transformer I use as a supply so I can scope everything without worrying to blow something due to wroung ground connections.

Offline Late

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Re: UD 2.7c "sawtooth" output
« Reply #26 on: July 25, 2023, 08:42:14 PM »
The probe is set to x1.
You should always keep your probe in 10X mode unless you're measuring very low voltages at low frequencies. In 10X mode the probe will also have a less of an effect on circuit. in 1X mode scope probe isn't rated up to the full bandwidth and voltage.

And was the ground lead connected to GND for all measurements?
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Offline Felix M.

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Re: UD 2.7c "sawtooth" output
« Reply #27 on: July 25, 2023, 09:24:14 PM »
And was the ground lead connected to GND for all measurements?
no

Offline Late

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Re: UD 2.7c "sawtooth" output
« Reply #28 on: July 25, 2023, 10:10:24 PM »
no
uhh it should have been connected. otherwise you have just one connection and u need both. for most measurements connect it to circuits negative terminal but about the output be careful. if its isolated then you should be able to connect the ground lead to one terminal and probe to other. just make sure the other ground lead isnt connected to anything
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Offline Felix M.

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Re: UD 2.7c "sawtooth" output
« Reply #29 on: July 25, 2023, 10:14:21 PM »
I‘ll kep it in mind for the future. The problem I have right now is a probably damaged channel 1 on my scope :(

Offline Late

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Re: UD 2.7c "sawtooth" output
« Reply #30 on: July 25, 2023, 10:22:10 PM »
likely just a probe or maybe even nothing at all. Have you tried connecting it to the scopes cal port for test?

And possibly the measurements looked like that because the ground lead of probe wasn't attached
Hi, my name is Patriks and I'm from Latvia. I'm interesting electronics, especially power electronics and high voltage. I also make content on YouTube showing my journey in the awesome world of High Voltage.

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Offline Felix M.

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Re: UD 2.7c "sawtooth" output
« Reply #31 on: July 25, 2023, 11:05:35 PM »
Both pobes don‘t work on ch1 but on ch2 non of them has any problems. I connected them to the callibration port to see in ch1 that the square wave goes up like it should be but then instantly ramps down back to 0V. Ch2 on the other hand works fine.

Offline Late

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Re: UD 2.7c "sawtooth" output
« Reply #32 on: July 25, 2023, 11:35:07 PM »
Both pobes don‘t work on ch1 but on ch2 non of them has any problems. I connected them to the callibration port to see in ch1 that the square wave goes up like it should be but then instantly ramps down back to 0V. Ch2 on the other hand works fine.
Hmm does switching from 1x to 10x on probe change anything? Ofc not counting the total amplitude

If not then yea something is cooked inside scope. Could be bc u measured something that's highish voltage with probes in 1x mode
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Offline Rafft

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Re: UD 2.7c "sawtooth" output
« Reply #33 on: July 26, 2023, 01:18:43 AM »


power just UD circuit only.
« Last Edit: July 26, 2023, 05:30:28 PM by Rafft »
SGTC / SSTC / DR-SSTC / QCW

Offline Felix M.

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Re: UD 2.7c "sawtooth" output
« Reply #34 on: July 26, 2023, 07:58:57 AM »
Hmm does switching from 1x to 10x on probe change anything? Ofc not counting the total amplitude

If not then yea something is cooked inside scope. Could be bc u measured something that's highish voltage with probes in 1x mode
Switsching between x1 and x10 doesn‘t chandge the strange measurements. Strangely a sine wave is no problem at all but the amplitude and voltage measurements in general are off. There was a case in the past with a CT where there was a potential of overvoltage but if I shot it with ov, wouldn‘t it measure anything?

Offline Egg

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Re: UD 2.7c "sawtooth" output
« Reply #35 on: July 26, 2023, 10:42:15 AM »
Both pobes don‘t work on ch1 but on ch2 non of them has any problems. I connected them to the callibration port to see in ch1 that the square wave goes up like it should be but then instantly ramps down back to 0V. Ch2 on the other hand works fine.

I have the same problem with my oscilloscope. Both channels work but first channel reads -140/-150v rms at all times making measuring low voltages almost impossible. Calibrating does not help either.

Offline Felix M.

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Re: UD 2.7c "sawtooth" output
« Reply #36 on: July 26, 2023, 12:41:35 PM »
Did you also have a situation where the scope might have seen too much voltage?

Offline Late

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Re: UD 2.7c "sawtooth" output
« Reply #37 on: July 26, 2023, 01:32:09 PM »
Switsching between x1 and x10 doesn‘t chandge the strange measurements. Strangely a sine wave is no problem at all but the amplitude and voltage measurements in general are off. There was a case in the past with a CT where there was a potential of overvoltage but if I shot it with ov, wouldn‘t it measure anything?

Yea seems like you have cooked something in the scope. For the future remember when you measure voltages in a CT always put a resistor in paralel with output. Something like a 10-100ohm resistor.

If you repeat all measurements of the circuit with the second channel in 10x mode do you still get a sawtooth wave on output?



edit - Also always keep your scope probe in 10X mode. Your scope is only rated to the max voltage and bandwidth in 10X mode and you're less likely to cook something with it.
« Last Edit: July 26, 2023, 04:06:42 PM by Late »
Hi, my name is Patriks and I'm from Latvia. I'm interesting electronics, especially power electronics and high voltage. I also make content on YouTube showing my journey in the awesome world of High Voltage.

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Offline Felix M.

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Re: UD 2.7c "sawtooth" output
« Reply #38 on: July 26, 2023, 11:26:09 PM »
I didn't had the time yet to remeasure everything but the output of the driver looks good. It has some spikes but it's a squarewave. The shot was done with no load whatsoever.


I talked to a friend of mine who has a lot of experience in the whole field and he mentioned that the "sawtooth" might look like a capacitor's discharge curve:


This would explain the strange signal that accures when the probe is hooked up to the calibratin port at the scope which puts out a 1kHz squarewave. There the discharge curves are even more visible.
« Last Edit: July 26, 2023, 11:31:27 PM by Felix M. »

Offline Late

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Re: UD 2.7c "sawtooth" output
« Reply #39 on: July 27, 2023, 12:15:39 AM »
I didn't had the time yet to remeasure everything but the output of the driver looks good. It has some spikes but it's a squarewave. The shot was done with no load whatsoever.

Yup the output looks good. It looks like its supposed to
Hi, my name is Patriks and I'm from Latvia. I'm interesting electronics, especially power electronics and high voltage. I also make content on YouTube showing my journey in the awesome world of High Voltage.

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Re: UD 2.7c "sawtooth" output
« Reply #39 on: July 27, 2023, 12:15:39 AM »

 


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July 02, 2024, 09:44:55 PM
post Re: LabCoatz Staccato QCW No straight sparks
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Admiral Aaron Ravensdale
July 02, 2024, 07:51:37 PM
post Re: LabCoatz Staccato QCW No straight sparks
[Dual Resonant Solid State Tesla coils (DRSSTC)]
ZakW
July 02, 2024, 06:14:07 PM
post Is this a good pulse experiment capacitor?
[Capacitor Banks]
FPS
July 02, 2024, 06:02:38 PM
post Re: LabCoatz Staccato QCW No straight sparks
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Admiral Aaron Ravensdale
July 02, 2024, 11:37:46 AM
post Re: Building my first DRSSTC
[Dual Resonant Solid State Tesla coils (DRSSTC)]
davekni
July 02, 2024, 05:22:10 AM
post Re: Coulometric hourmeters
[Laboratories, Equipment and Tools]
davekni
July 02, 2024, 05:16:30 AM
post Re: Building my first DRSSTC
[Dual Resonant Solid State Tesla coils (DRSSTC)]
drobotk
July 01, 2024, 11:50:12 PM
post Re: Restoring a Rogowski coil calibrator
[Capacitor Banks]
klugesmith
July 01, 2024, 08:48:53 PM
post Uses for Weston's Little Bee probe
[Laboratories, Equipment and Tools]
klugesmith
July 01, 2024, 08:40:59 AM
post Re: Coulometric hourmeters
[Laboratories, Equipment and Tools]
klugesmith
July 01, 2024, 08:09:42 AM
post Re: Coulometric hourmeters
[Laboratories, Equipment and Tools]
davekni
June 30, 2024, 06:49:45 AM
post Re: Restoring a Rogowski coil calibrator
[Capacitor Banks]
davekni
June 30, 2024, 03:57:13 AM
post Re: Coulometric hourmeters
[Laboratories, Equipment and Tools]
klugesmith
June 30, 2024, 03:19:40 AM

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