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Old 29th May 2010, 05:00 AM   #431
1audio is online now 1audio  United States
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The AA5001 is has remote interface over GPIB in the appropriate chassis.

There was a govt spec for these that all the analyzer companies built instruments for. The AA5001, the HP8901, the Boonton 1120 and 1121, the Krohn Hite 6880 and some obscure Sound Technology models all have similar specs and seem to be targeted at the specific contracts. All of the Boontons on the surplus market I have found have mil tags on them.

Any of these would be very good on a bench. The Boonton is quick and easy to use and has synthesizer frequency accuracy as well as quite good performance. The HP is similar but you want the b version with its true balanced input. The Krohn Hite stuff seems to have a .002% distortion floor. However the auto tuning works real well. I saw the ST stuff at Sound Technology but only saw one sample on eBay in the last 10 years.

Many of these can be had for around $300 if you are patient.
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Old 29th May 2010, 05:02 AM   #432
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I would use 75 Ohm cables for audio measurements given a choice. The 50 Ohm cables have higher capacitance. I like the cables with molded ends. They hold up much better. You can get adapters that will convert BNC to pretty much any audio connector type.
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Old 20th April 2011, 04:16 AM   #433
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can somebody help me find users manual of tektronix 454a oscilloscope please::::::::::::::::::::;
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Old 20th April 2011, 04:39 AM   #434
1audio is online now 1audio  United States
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Start out with BAMA BAMA They have a very large selection of manuals,.
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Old 20th April 2011, 10:47 AM   #435
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There's also a Tektronix group on yahoo groups -- with quite a number of Tek folks (same with HP and Genrad groups). The TekScopes@Yahoo group is very active
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Old 20th April 2011, 01:04 PM   #436
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Quote:
Originally Posted by 1audio View Post
Start out with BAMA BAMA They have a very large selection of manuals,.
cannot open this link
Tektronix
454a
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Old 20th April 2011, 03:11 PM   #437
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Quote:
Originally Posted by engel dela pena View Post
cannot open this link
Tektronix
454a

Try this,

http://bama.edebris.com/manuals/

David.
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Old 1st June 2011, 04:28 PM   #438
lhquam is online now lhquam  United States
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Default M-Audio Audiophile 192 anti-aliasing filters

I am trying to use an Audiophile 192 (AP192) in a software spectrum analyser using the Cordell Distortion Magnifier. The problem I observe is that the AP192 ADC and DAC anti-aliasing filters appear to always kick in at around 20 KHz at ALL sample rates. Attached is the power spectrum for loopback of white noise.

I would really like to run the AP192 at a 192 KHz sample rate, with anti-aliasing filters at around 96 KHz. Is there any way to control the cut-off frequency of the AP192 anti-aliasing filters? Perhaps this is a limitation of the AP192 Linux sound card driver.

My configuration is:

AMD Athlon dual-core X86-64 5600+
4 GB RAM
Fedora 14 Linux
running Audacity and other sound software
M-Audio Audiophile 192
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File Type: jpg ap192-loopback.jpg (75.6 KB, 269 views)
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Old 1st June 2011, 08:12 PM   #439
davada is offline davada  Canada
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Quote:
Originally Posted by lhquam View Post
I am trying to use an Audiophile 192 (AP192) in a software spectrum analyser using the Cordell Distortion Magnifier. The problem I observe is that the AP192 ADC and DAC anti-aliasing filters appear to always kick in at around 20 KHz at ALL sample rates. Attached is the power spectrum for loopback of white noise.

I would really like to run the AP192 at a 192 KHz sample rate, with anti-aliasing filters at around 96 KHz. Is there any way to control the cut-off frequency of the AP192 anti-aliasing filters? Perhaps this is a limitation of the AP192 Linux sound card driver.

My configuration is:

AMD Athlon dual-core X86-64 5600+
4 GB RAM
Fedora 14 Linux
running Audacity and other sound software
M-Audio Audiophile 192
I think PMA have one of these. Maybe ask him.

David.
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