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Old 01-10-2016, 12:17 AM #81
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Default Re: Suggestions on variable DC power supplies/oscilloscope discussion.

[Three Channel Method]
You need a resistor (or capacitor) on the primary, none on the secondaries. The calibration port is only used to driving high impedance loads like the scope probes. Probes are typically 1MegOhm, so stick a meg resistor in series with one of the primary leads, or use a 150pF capacitor in series. Or any combination of resistor and capacitor that equals about 1MegOhm impedance. Xc = 1/(2pi*f*c) c is in farads. But yeah you look at the outputs in reference to the inputs, one of them will be antiphase if done correctly.

[Two Channel Method]
You can also forgo using the calibration port and just use an alkaline, NiMH, ZnC, or other high internal resistance battery (no lithiums or lead!). What you do is place the scope probes across the secondaries, connect one primary lead to the battery negative, and then momentarily connect the other primary lead to the battery positive terminal. You don't want to leave the positive connected for more than a second or so, transformers don't transmit DC, just changing voltages only, so it will only see the change in voltage as you connect and disconnect the positive. While the positive is actually connected you're just burning power in the primary winding. Anyway, as before one secondary should be antiphase of the other.


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Old 05-30-2016, 12:58 AM #82
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Default Re: Suggestions on variable DC power supplies/oscilloscope discussion.

Look at all this stuff, look what you guys got me into! Anyways. I ordered a signal generator off eBay and it is very practical. After reading the manual it was pretty straight forward. Just for a trial run/practice I tested out a wound GDT at my TC f0 222kHz scoped a secondary and the image was a very nice squarewave with a SLIGHT spike on the leading edge. Referencing Richard Burnetts page my winding and core are good. It came with the software to hook up to my laptop for optimal interface!
Link to they generator:
25MHz Dual Channel DDS Arbitrary Waveform Function Signal Generator Counter Kit | eBay



I know this post is encroaching upon the tesla coil thread but I need to test my USSSTC sig designed to trouble shoot a failure in output.
Now to replicate my Drivers output in CW mode what parameters would I select? I'm guessing a very HIGH duty cycle nearing 100%

My plan. First Feed the signal generator probes into the driver antenna block.
Use duel oscope channels to read the output of the GDT secondaries. (I will be testing the powered driver to the GDT secondaries)

Item # 2. This might be transformer 101 but when I put my 120vac-12vac 2a step down transformer my oscilloscope measures a 19v pk? (39v pk-pk)I'd expect to see the true RMS 1.414 x 12vac = 16.96(oops corrected by cyp). That's what my DMM reads. The O-scope reads higher.
The data sheet for the "TF quotes 15% regulation typ @ full load to no load"
http://www.mouser.com/ds/2/410/F-218X-780974.pdf
What's the deal with this?
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Old 05-30-2016, 02:21 AM #83
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Default Re: Suggestions on variable DC power supplies/oscilloscope discussion.

Quote:
Originally Posted by Down with Umbrella View Post
1.414 x 12vac = 14.60.
While you're stocking your lab, you may want to consider a new calculator

12Vrms is 17V peak. Add on the other 15% for no load, and that's up around 19V. Looks fine to me.
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Old 05-30-2016, 02:31 AM #84
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Default Re: Suggestions on variable DC power supplies/oscilloscope discussion.

Quote:
Originally Posted by Cyparagon View Post
While you're stocking your lab, you may want to consider a new calculator

12Vrms is 17V peak. Add on the other 15% for no load, and that's up around 19V. Looks fine to me.
Doh! You're correct, calculations should come from the tool not memory if I'm being specific. X that value by .707 and I'll get 12V.
Thanks for the input on those pk values.
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Old 05-31-2016, 12:04 AM #85
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Default Re: Suggestions on variable DC power supplies/oscilloscope discussion.

Quote:
Originally Posted by Down with Umbrella
I need to test my USSSTC sig designed to trouble shoot a failure in output.
Now to replicate my Drivers output in CW mode what parameters would I select? I'm guessing a very HIGH duty cycle nearing 100%.
It will be a 50% duty cycle square wave with rise/fall times less than 100nS. =)

Duty cycle in CW refers to how much of the cycle is active, duty cycle in pulsed mode refers to how many cycles per unit of cycles are active. So while CW is 100% pulse duty, it's 50% cycle duty.
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Old 05-31-2016, 12:37 AM #86
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Default Re: Suggestions on variable DC power supplies/oscilloscope discussion.

I jelly. i dont have a garage or shop to build a nice bench. Oh well I get to it eventually. once i have my desk psu built I can go ahead with working on getting a lab multi meter and a signal gen and a oscilloscope. I found a small psu that i have almost all the parts for that I going to build that will give me 30 volts at 4 amps which will be plenty for my needs
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