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Low Distortion Signal Generator

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holycat
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Joined: April 11th, 2009, 3:45 pm

Low Distortion Signal Generator

Post by holycat » April 22nd, 2009, 8:07 pm

Does Tektronix has low distortion signal generator?
used to test audio amplifier

Yes, low distortion signal generator for audio purpose.

Carl M
Tektronix Applications
Tektronix Applications
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Joined: July 30th, 2008, 4:45 pm
Country: United States

Re: Low Distortion Signal Generator

Post by Carl M » April 29th, 2009, 1:56 pm

And I want a fast car.

Have you looked at the AFG3022B? I'd say start there.
Tektronix Application Engineer

holycat
Posts: 16
Joined: April 11th, 2009, 3:45 pm

Re: Low Distortion Signal Generator

Post by holycat » April 30th, 2009, 5:29 pm

Yes, I purchased a AFG3022 last week
AFG3022 THD<0.2%(10Hz~20KHz,1Vpp)
but Most audio amplifier's THD<0.01%

Does Tektronix has a low distortion singal generator for audio purpose?

Carl M
Tektronix Applications
Tektronix Applications
Posts: 797
Joined: July 30th, 2008, 4:45 pm
Country: United States

Re: Low Distortion Signal Generator

Post by Carl M » May 5th, 2009, 4:48 pm

You are making a gross generalization of audio amplifiers. A THD spec means nothing without qualifiers. What's the load? What's the amplitude? What's the frequency?

The AFG3022 is what I or my colleagues would recommend for audio applications. If you find the AFG3022 unacceptable, I cannot help you.

1 Vpp (50 ohms) 2 kHz sine wave
Image

8 Vpp (50 ohms) 2 kHz sine wave since the spec is at 1vpp, I wanted to see if it was much worse at higher amplitudes. Still good.
Image

For comparison (and fun) I also measured an old analog 2 MHz Tek function generator that was under my desk. Noise is easy to find when you go looking for it. :lol:
Image

These measurements are from the AFG3022 from my lab. Measured with an RSA3408B.
This is a sample of one. Your AFG is likely to be different.
Tektronix Application Engineer

holycat
Posts: 16
Joined: April 11th, 2009, 3:45 pm

Re: Low Distortion Signal Generator

Post by holycat » May 14th, 2009, 6:40 pm

SRS(Stanford Research Systems)DS360 function generator , 0.001% THD(-100dB), impressive

NF(a Japanese company) WF series function generator, Frequency Resolution: 0.01uH(Tek AFG3000: 1uH), Duty Range:0.0000% to 100.0000%, Resolution:0.0001%(Tek AFG3000: 0.001% to 99.999%)
Output range:0mVp-p to 20.000Vp-p/open(Tek AFG3000:20mVp-p to 20Vp-p, cant down to omV, cartridge output several mV, even less than 1mV,moving coil and moving magnet )
impressive

Dear TEK, be humble

holycat
Posts: 16
Joined: April 11th, 2009, 3:45 pm

Re: Low Distortion Signal Generator

Post by holycat » May 17th, 2009, 6:45 pm

Tektronix AFG3000: 1ppm drift per year ---- great
14bits resolution ----- great
output short circuit infinite time ----- great

Carl M
Tektronix Applications
Tektronix Applications
Posts: 797
Joined: July 30th, 2008, 4:45 pm
Country: United States

Re: Low Distortion Signal Generator

Post by Carl M » May 20th, 2009, 3:53 pm

You are comparing apples to oranges here. The DS360 is indeed impressive but it's a different instrument (20-bit, max: 200 kHz). Of course there are better instruments but at what cost? Use the right tool for the job. IMHO, the AFG3000 series is a work horse and a great value considering it's overall performance & features.
Tektronix Application Engineer

Dean Huster
Posts: 34
Joined: March 31st, 2014, 1:53 pm

Re: Low Distortion Signal Generator

Post by Dean Huster » April 17th, 2014, 3:43 pm

The SG505 ultra-low distortion audio oscillator is designed to go with the AA501 THD analyzer. I believe the SG505 is capable of less than 0.008%, plenty low for anyone but an audiophool. They're going for around $225 - $300 on epay right now -- if you can find one. I believe the TM5000 equivalent is the SG5010 and adds GPIB control.

Carl M
Tektronix Applications
Tektronix Applications
Posts: 797
Joined: July 30th, 2008, 4:45 pm
Country: United States

Re: Low Distortion Signal Generator

Post by Carl M » June 9th, 2014, 11:54 am

my images where moved, i don't know where they are. this discussion is way beyond stale.
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