Fozgometer?

Here is a much cheaper and better way, which is really not much more difficult:

You can use the same method (Test record with 1KHz test signal) with a laptop and a free downloaded spectrum analyzer. I feed the signal from my phonostage into my Macbook.

Spectrum analyzer is iSpectrum. You can put a marker at 1KHz that displays the signal in dB at 1KHz (so no notch filter needed). You can toggle iSpectrum between left and right channel so that you can easily measure the crosstalk in dB.

For example, you measure a signal at -30dB in the left channel and the crosstalk at -66dB in the right channel giving you a crosstalk separation of 36dB. You minimize the crosstalk just as for the Fozgo meter.

This method is free, only requires a RCA to mini cable to connect to your Laptop and the signal is more stable as you can choose different averaging method with iSpectrum. Another plus is that you see the frequency played from LP displayed in the spectrum analyzer so can finetune the speed of the turntable as the signal should be direct at 1KHz.

This method safes you both the need for a the Fozgo + KAB spectrum analyzer. Let me know if you have any questions.

The difference is that, instead of a 1khz tone, it has a pink noise tone. I doubt if that would make a difference, though. Either should work.

For both the Fozgo and the method I just described you need a sine signal, for pink/white noise the signal is not stable. The Cardas record works well as the 1KHz signal is in the middle of the record.

Don_c55,

The electrical "balance" (output in each channel) of a cartridge is almost never exact. You need to adjust the balance control for the proper centering of the image after azimuth is set.

Both the Fozgo and the spectrum analyzer method does not adjust for "Balance" but for "Crosstalk". Crosstalk is the only correct way to tell 1-2 degree accuracy of azimuth alignment for the cartridge.

Wouldn't the soundcard in your laptop need to be calibrated to provide an accurate measurement? I know that some room measuring software, such as REW, requires that your soundcard be calibrated in order to provide an accurate measurement.

No need to calibrate the soundcard as you are only measuring a single frequency at 1KHz. I would assume that input into a soundcard is pretty balanced as far as sensitivity goes. If you want to make sure the measurement does not depend on balance, switch channels and see whether the results are the same.

For frequency response measurements, a calibration is useful as most likely a soundcard is not perfectly flat with respect to frequency response.

Good luck,

Rene

Also when I say soundcard, I should say that that the Microphone input on the Macbook is good enough for azimuth and speed. For frequency measurements a better soundcard (e.g. Agogee Duet) would be preferable.

From what i ve read it may have been easier to do this adjustment with a Fozgometer but it can be done with a DDM also.

The only problem is that with a DMM you are sensitive to broadband noise when measuring the small crosstalk signal. Some portion of the signal you measure may be simply noise not crosstalk. If you use the spectrometer method I suggested earlier in this post you circumvent this problem