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Old 2nd August 2013, 06:11 PM   #1
davada is offline davada  Canada
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Default Audio Precision AP Analyser series

The thread is dedicated to AP products.

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Old 2nd August 2013, 06:17 PM   #2
1audio is offline 1audio  United States
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We just learned that the software for the first generation AP System One, is not compatible with the System 2 and later stuff. Implications?
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Old 2nd August 2013, 06:47 PM   #3
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Quote:
Originally Posted by 1audio View Post
We just learned that the software for the first generation AP System One, is not compatible with the System 2 and later stuff. Implications?
You can install the earlier AP operating systems on the host computer and gradually update them to each new version. It's not a lot of fun. Walt sent me a couple of the macros he used for his 1995 regulator articles and I was able to move my way through them. In the end, however, it was easier to write the macros myself.
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Old 2nd August 2013, 10:34 PM   #4
RNMarsh is offline RNMarsh  United States
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The sys one osc and analog analyzer is pretty good.... if you have the dual domain model, the DSP/FFT will indicate higher levels of harmonics and THD than the same test without the DSP... check via self test and read the datanumbers and compare. The FFT uses a 16 bit system so is more limited for higher than -95dB harmonics. just stay with analog analyzer portion.

I have the paper book manuals (when available was >$200) if you want them. My Sys One is now in use in Asia. Also, original software disk if needed.... i had the last/latest version before they stopped supporting the Sys One. Of course, it might also all avail for download copy from A-P site.

Their app notes are very helpful too. Shows the macro they wrote for some tests that wasnt included in the original software or gave third party/customers programs and they passed it on to A-P.

Thx-RNMarsh

Last edited by RNMarsh; 2nd August 2013 at 10:38 PM.
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Old 2nd August 2013, 11:04 PM   #5
wayne is offline wayne  United States
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The software and manuals should be available on the AP site. They kindly posted it all when support was discontinued for System one. Still have 6 of them testing away.
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Old 3rd August 2013, 07:26 AM   #6
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Quote:
Originally Posted by RNMarsh View Post
The sys one osc and analog analyzer is pretty good.... if you have the dual domain model, the DSP/FFT will indicate higher levels of harmonics and THD than the same test without the DSP... check via self test and read the datanumbers and compare. The FFT uses a 16 bit system so is more limited for higher than -95dB harmonics. just stay with analog analyzer portion.
A properly dither 16 bit system has no -95 dB limit to harmonic resultion; in fact it has non at all. Also as noted earlier an several times in another thread, with correct configuration the DSP analyzer of the System One is limited by the distortion performance of the analog analyzer, not the ADC.

Samuel
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Old 3rd August 2013, 02:53 PM   #7
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Here's a macro example:

' Analog Noise Grapher
' This macro calculates noise voltage per root Hertz value at each frequency ' step utilizing the
' Analog Analyzer's Bandpass Function. The voltage is
' divided by amplifier Gain, filter factor and the square root of frequency
' to yield noise in nanoVolts per root Hertz.
' The data should be saved in an AP Data File for future reference.
'
' March 2012
Dim Counter As Integer
Dim FLow As Double
Dim FHigh As Double
Dim Steps As Double
Dim Gain As Integer
Dim Name As String
Sub Main
Debug.Clear
FLow=10
FHigh=100000
Steps=39
Counter=10
Name="LM317_POZ_Noise"
AP.Application.PanelOpen(apbPanelAnlrLarge)
AP.Application.PanelOpen(apbPanelSweepSmall)
AP.Anlr.ChAInput=0 'XLR
AP.Anlr.FuncMode=1 'Bandpass
AP.Anlr.RdgRate=8 'Auto Precise Reading Rate
AP.Anlr.FuncBPBRTuning=1 'Sweep track
AP.Anlr.FuncDetector=0 'RMS Detector
AP.Anlr.ChALevelSettling(1,1e-8,"V",20,0.05,0)
AP.Graph.Label(apbAxisLeft) = "Noise V/RtHz"
AP.Graph.CommentShow = False
AP.Graph.TimeDateShow=True
AP.Sweep.Data1.Id=5907 'Analog Bandpass Function
AP.Sweep.Source1.Stop("Hz") = FHigh
AP.Sweep.Source1.Start("Hz") = FLow
AP.Sweep.Source1.Steps = Steps
AP.Sweep.Data1.Bottom("V")=1e-10
AP.Sweep.Data1.Top("V")=0.001
Wait 1
AP.Sweep.Start
SizeA=AP.Data.ColSize(0,1)
Freq=AP.Data.XferToArray(0,0,"Hz")
LevelA=AP.Data.XferToArray(0, 1, "V")
For Size=0 To (SizeA-1)
LevelA(Size)=LevelA(Size)/Sqr(Freq(Size))
LevelA(Size)=LevelA(Size)/48.12
Next
AP.Graph.Legend.Comment(1, 1) = Name
AP.Data.XferToArray(0,1,"V")=LevelA
AP.Sweep.Data1.LogLin = 0
End Sub
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Old 3rd August 2013, 02:58 PM   #8
RNMarsh is offline RNMarsh  United States
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Quote:
Originally Posted by Samuel Groner View Post
A properly dither 16 bit system has no -95 dB limit to harmonic resultion; in fact it has non at all. Also as noted earlier an several times in another thread, with correct configuration the DSP analyzer of the System One is limited by the distortion performance of the analog analyzer, not the ADC.

Samuel
Yes, I hear this a lot..... however, in just pushing buttons on a computer screen shows what I said. I want to make others aware that the settings/setup can give different results. Not that it has to be that way... it is the way it is made. The 'correct' configuration should be the default setting(s) from the manufacturer.

Can you direct us to the proceedure for the "correct" configuration so we can get same or better data using the FFT/DSP with the SYS One Dual Domain ??

Thx-RNMarsh
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Old 3rd August 2013, 03:41 PM   #9
udailey is offline udailey  United States
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I have a Portable One.
Two questions. The backlight has gone out and they want 400usd or thereabouts for the replacement. I think thats because its attached to the display board. Have any of you ever opened this guy up and is it a simple thing to replace the light? Its got to be but wanted to ask before I open it up.
The other question is about printing directly from the Portable One. AP has told me twice that there are plenty of printers that it will print directly to but that they can no longer suggest a certain one to use because there are so many new printers out there. I wonder if anyone has a suggestion for a printer that they KNOW works and is just plug n play.
This is what mine looks like
http://www.avalontest.com/AudioPreci...-Analyzer.html
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Old 4th August 2013, 02:36 PM   #10
1audio is offline 1audio  United States
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You might be able to find an electro luminescent panel on eBay that will work. They are cheap from China.
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