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THD sweep versus output power using Audio Precision SYS-2700
THD sweep versus output power using Audio Precision SYS-2700
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Old 4th March 2014, 01:26 AM   #11
tomchr is offline tomchr  Canada
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In the Sweep Panel, make Data 1 the output from the THD analyzer. Set Data 2 to be the analyzer level and select Watt for the unit. Maximize the Sweep Panel and in the section that appears, select X-Y Data 2 on X.

Wow. Not intuitive. But it does the job.

The reference resistor used for figuring the power is that set in the Analyzer Panel.

~Tom
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Old 4th March 2014, 03:13 AM   #12
jackinnj is offline jackinnj  United States
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THD sweep versus output power using Audio Precision SYS-2700
When in doubt, read the manual.
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Old 4th March 2014, 08:34 AM   #13
tomchr is offline tomchr  Canada
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I dunno... There's something highly unnatural about reading manuals. I was a bit concerned that my man card would get revoked as well...

~Tom
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Old 4th March 2014, 08:37 AM   #14
jan.didden is offline jan.didden  Europe
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Yes that's why there is the 'W' selection in the data1 & data2 set up boxes.
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Old 4th March 2014, 03:06 PM   #15
jackinnj is offline jackinnj  United States
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THD sweep versus output power using Audio Precision SYS-2700
Men don't come with instructions. It's on page 412. I had to change this to protect the innocent:
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Old 4th March 2014, 05:23 PM   #16
tomchr is offline tomchr  Canada
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Quote:
Originally Posted by jackinnj View Post
It's on page 412.
I know. See Post #10.

I recommend using the "Precision-Auto" settling in the analyzer panel as well. It lowers the noise floor. I should probably read the analyzer part of the manual as well. I'm designing a li'l amp that I expect to push the capabilities of the AP instrument in terms of THD.

~Tom
__________________
Modulus-86: 40W/8Ω @ 0.000061% THD. HP-1: 3W/20Ω, 450mW/300Ω @ 0.000032% THD. DG300B and Other Tube Circuits.
Neurochrome : : Audio - www.neurochrome.com - Engineering : : Done : : Right
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Old 14th March 2014, 02:40 AM   #17
RNMarsh is offline RNMarsh  United States
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THD sweep versus output power using Audio Precision SYS-2700
Quote:
Originally Posted by tomchr View Post
I know. See Post #10.

I recommend using the "Precision-Auto" settling in the analyzer panel as well. It lowers the noise floor. I should probably read the analyzer part of the manual as well. I'm designing a li'l amp that I expect to push the capabilities of the AP instrument in terms of THD.

~Tom
How is that amp coming along.... progress?

THx-RNMarsh
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