ruler units

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dougxr
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ruler units

Post by dougxr »

Hi,

I'm looking at a recorded spectrum and trying to determine the peaks using a ruler. The measurement in the ruler dialog box is in MHz to 3 decimal places but the peak I'm looking at is about 1.9kHz. So the dialog box is telling me "0.002 MHz" for quite a few points in the region I'm looking at.

I can set the ruler to be at the exact frequency I'm expecting by typing "1916.67Hz" in to the dialog box and it puts the ruler there but changes the dialog box to "0.002 MHz". And the peak isn't quite at that frequency. I suppose I could keep typing different numbers in and moving the ruler that way to see when it lines up with the peak but that seems a bit daft.

Is there a way I can tell the ruler dialog box to use Hz or kHz?* Or maybe just increase the number of decimal places?

The scale on the full spectrum does go up to the MHz region but I'm not interested in that at the moment.

I thought I found something. After putting the ruler in approximately the right place I zoomed in a bit more and the ruler dialog box changed to kHz. But when I moved the ruler it changed back to MHz. So I can do it by lining up the ruler and then adjusting the zoom but that also seems daft.

I understand there may be a way of doing this with a measurement (and I might investigate that now) but I'd like to get the ruler figured out for more general use.

These seems like such a stupid question that I was a bit hesitant to post it but I can't find anything similar in the use guide or in the forum. If I'm looking in the wrong place then I'd appreciate it if someone could point me in the right direction.

I would appreciate any help or suggestions,

Regards,

Doug.

* - the bold bit is not meant to be me shouting, just highlighting the main question to save reading all the other rubbish I've written.

Gerry
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Re: ruler units

Post by Gerry »

Hi Doug,

In case you haven't had a chance to figure this out yet, (and in case anyone else is interested in a workaround) what you can do is create a measurement that is "Frequency at peak", using "Peak nearest ruler 1", and then place your ruler close to the peak of interest to get an accurate frequency measurement in the measurement bar.

The Gif in the following link demonstrates the method and zooms in to confirm that it's correct: https://drive.google.com/file/d/1GehdtS ... sp=sharing.

Regards,

Gerry
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dougxr
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Re: ruler units

Post by dougxr »

Hi Gerry,

That's a useful tip, it helps a lot. And I can play with the number of bins that it searches across which gives me another aspect to doing it that way.

I hadn't thought of using a measurement.

It's going to save me quite a bit of time.

Thanks for your help,

Doug.

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