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DIY Audio Analyzer with AK5397/AK5394A and AK4490
DIY Audio Analyzer with AK5397/AK5394A and AK4490
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Old 26th March 2019, 06:11 PM   #2651
1audio is offline 1audio  United States
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Join Date: Mar 2004
Location: SF Bay Area
Do you have another 1 Ohm resistor? Replace the circuit board with the resistor and you should get 1 Ohm on the plot.

I'll try this later today If i get time. I have a 1 Ohm reference resistor (.005%) and some other good references to check with.
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Old 26th March 2019, 09:49 PM   #2652
lemon is offline lemon  Greece
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I am sure that have another 1 Ohm resistor with closer value.
I will check this tomorrow.
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Old 28th March 2019, 04:04 PM   #2653
lemon is offline lemon  Greece
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Hi Demian,

I took an 1R resistor that the LCR DER-EE DE-5000 measured:
100Hz..... 1.01R
120Hz.... 1.00R
1KHz..... 1.006R
10KHz.... 1.007R
100KHz... 0.996R

This resistor set between two OFC terminals of my cable setup like photo attached.
If this is what you want, the Zo measurement was from 20-20000Hz to 1.0019 Ohm with upper at the 1.0022 Ohm of 85KHz.
If this test was right, I think must repeat with real reference resistor for valid results.
Attached Images
File Type: png Zo Refrence 1R.png (40.5 KB, 162 views)
File Type: jpg Zo connection R Refer.JPG (356.5 KB, 144 views)
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Old 28th March 2019, 04:55 PM   #2654
1audio is offline 1audio  United States
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Join Date: Mar 2004
Location: SF Bay Area
That measurement looks good except the phase is reversed. Swap one pair of differentials going to the RTX so the phase is 0 degrees across the measurement range. Then take about 20 cm of 20 to 24 AWG copper wire in a tight loop to get something in the 10 milliOhm range (I got about 8 milliOhms for 20 CM of 24 AWG copper at room temperature) and make sure its still around 0 degrees and much smaller than the 1 Ohm resistor. If a and b are swapped you will get 100 ohms instead of 10 milliOhms.

I have been dealing with this for years measuring driver impedance and always need to go through these checks to get everything right. (8 connections mean 8 factorial ways to get them wrong. I have done all of those) If its not fixed like the DER there are many ways to get confused. These simple checks ensure the measurements will be accurate.
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