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Old 2nd September 2013, 03:36 PM   #51
Pano is offline Pano  United States
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The second entry was just a happy guess. You can unprotect the sheet with the password wt2 if you want to change anything.

You want 10 trials of the same values?
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Old 2nd September 2013, 03:55 PM   #52
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10 trials with one emulator. I found that there was not good repeatability with the WT3 I used. It also never got close to the correct Qts.
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Old 2nd September 2013, 03:57 PM   #53
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Will do.
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Old 3rd September 2013, 01:31 AM   #54
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Default WT3 tests

Here are 3 trials of 10 sweeps on the same driver. Software shut down and restarted between run 2 and 3.

Qts=
0.6457
0.6457
0.6456
0.6459
0.6458
0.6528
0.6459
0.6456
0.6452
0.6456

0.6573
0.6572
0.6569
0.6568
0.6570
0.6566
0.6569
0.6573
0.6570
0.6575

0.6569
0.6566
0.6571
0.6567
0.6571
0.6567
0.6566
0.6565
0.6569
0.6567

I'll build an emulator and try that.
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Old 6th September 2013, 12:58 AM   #55
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Strange, I see that my emulator post from Monday didn't make it thru. A glitch.

Anyhow, with a big inductor of about 11.5mH and a 10000 uF cap I got results that were somewhat near the mark. Trying with a smaller inductor, like 6 mH, I could not get numbers anywhere near what they should be by formula. So maybe the WT3 doesn't work that way?
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Old 6th September 2013, 01:09 AM   #56
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For the 11.5 mH inductor what is the resistance of the inductor?

For the 6 mH inductor what is the resistance of the inductor?

Last edited by woofertester; 6th September 2013 at 01:17 AM.
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Old 6th September 2013, 01:12 AM   #57
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0.4R and 0.25R, I think. Will go to the lab and check.
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Old 6th September 2013, 01:28 AM   #58
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More info:
Inductors were 4.1 mH DCR 0.29 ohms and 11.92 mH DCR 0.42 ohms
Caps of 10000 uF and 15000 uF were used, but I don't have away to measure values that high.
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Old 6th September 2013, 01:37 AM   #59
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Quote:
Originally Posted by Pano View Post
More info:
Inductors were 4.1 mH DCR 0.29 ohms and 11.92 mH DCR 0.42 ohms
Caps of 10000 uF and 15000 uF were used, but I don't have away to measure values that high.
Add 5% to the capacitor and run the calculation. Subtract 5% from the capacitor and run the calculation. That should bracket the measurement.

Report the calculated Fs and Qt bracketed values and what results you obtained for your WT3. That will be a starting point for the discussion. There is an easy experiment once you have this base line reported.
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Old 6th September 2013, 02:03 AM   #60
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Quote:
Originally Posted by gornir View Post
I'm sure the WT2 device is equally good or better than the WT3
The Smith & Larson WT2 is WAY better than the WT3 (at least for T/S, i don't use it for anything else).

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