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Not Getting Accurate FRD and ZMA
Not Getting Accurate FRD and ZMA
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Old Yesterday, 11:22 AM   #1
KING DRANZER is offline KING DRANZER
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Join Date: Jan 2020
Default Not Getting Accurate FRD and ZMA

I am using FPGraphTracer to get FRD and ZMA files from the pic of the graph and the resulting output is not accurate. I am having this problem with only specific driver "Fountek Neo X1.0" as it worked fine for other drivers.



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Old Yesterday, 08:00 PM   #2
ernperkins is offline ernperkins  United States
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Did you double check your axis settings? This graph starts at 1 KHz which isn't typical. Using your picture I was able to get the FRD without any problem, but I did have to color the impedance plot before FPGraphTracer could trace it. I attached the FRD and ZMA files (renamed as .txt so I could upload them).
A couple of notes:

- IMO the FRD really needs more information added below 1 KHz to be useful for simulations. My first approximation would be to add a -12 dB/octave "tail" starting at 1 KHz. Several free programs allow adding "tails", XSim is one.

- The graphs will look a lot different when displayed on a 20Hz - 20 KHz graph.

Hope this helps...
Attached Files
File Type: txt NeoX 1.0 FRD.txt (6.2 KB, 1 views)
File Type: txt NeoX 1.0 ZMA.txt (27.1 KB, 1 views)

Last edited by ernperkins; Yesterday at 08:01 PM. Reason: typo
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Old Today, 03:41 PM   #3
KING DRANZER is offline KING DRANZER
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Join Date: Jan 2020
Quote:
Originally Posted by ernperkins View Post
Did you double check your axis settings? This graph starts at 1 KHz which isn't typical. Using your picture I was able to get the FRD without any problem, but I did have to color the impedance plot before FPGraphTracer could trace it. I attached the FRD and ZMA files (renamed as .txt so I could upload them).
A couple of notes:

- IMO the FRD really needs more information added below 1 KHz to be useful for simulations. My first approximation would be to add a -12 dB/octave "tail" starting at 1 KHz. Several free programs allow adding "tails", XSim is one.

- The graphs will look a lot different when displayed on a 20Hz - 20 KHz graph.

Hope this helps...
Thank you very much. The problem was with db scale as it was not being read accurately. Even-though it was maxing out at 100db the resulting file was capping the top at 110db instead.
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