Hi,
Is there a way to switch to a logarithmic sweep, like other spectrum analyzers do?

BR, Alois

No, but it may be in the future
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Hello Erik,
Thank you. I hope, this would come in the future, and I assume it's not so difficult, as only the LO has to be programmed with log. values. The tinySA combined with a LISN helps to do easy and cheap EMC precompliance measurements at 150 kHz ... 30 MHz. The level results are comparable with those from EMC labs, but the EMC receivers are sweeping logarithmic. So, comparison would be perfect with log. sweep.

BR,
Alois

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A simple solution would be to do linear sweeps but draw log graphics (as an option). I do it in the PHSNA.

Ignacio

Hello Erik,
Thank you. I hope, this would come in the future, and I assume it's not so difficult, as only the LO has to be programmed with log. values. The tinySA combined with a LISN helps to do easy and cheap EMC precompliance measurements at 150 kHz ... 30 MHz. The level results are comparable with those from EMC labs, but the EMC receivers are sweeping logarithmic. So, comparison would be perfect with log. sweep.

BR,
Alois

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On Thu, Nov 11, 2021 at 08:24 AM, EB4APL wrote:

A simple solution would be to do linear sweeps but draw log graphics (as an option). I do it in the PHSNA.

Ignacio

?

? ? For comparison with measurement data from an EMC receiver making logarithmic sweeps, your suggestion would not work for Alois as the measurement increments are different between linear and logarithmic sweeps and the measurement data points will differ.

? ?In addition to logarithmic sweeping, an EMC receiver/software is capable of a lot more measurement points than the tinySA; so, a 10kHz to 30MHz sweep may need to be broken up into several frequency bands and "stitched" together when using the tinySA in order to match the measurement data from an EMC receiver.

? ?If care is taken to closely match measurement bandwidth, frequency increment, and protect the tinySA front end from 50/60Hz related harmonics/transients when connected to a Line Impedance Stabilization Network (LISN), then I agree with Alois that tinySA can be an economical measurement receiver for performing pre-compliance conducted emissions measurements.

Herb