Search found 17 matches

by jcclq
Tue Sep 14, 2021 4:59 pm
Forum: General Software Discussions
Topic: Setting the number of bits
Replies: 3
Views: 3469

Re: Setting the number of bits

Hi Benno

It is a 5242D (2 channels), and I would like to be sure I am using the whole 16-bits resolution on the channel I am using.

Thanks
JC
by jcclq
Tue Sep 14, 2021 4:31 pm
Forum: General Software Discussions
Topic: Setting the number of bits
Replies: 3
Views: 3469

Setting the number of bits

Hi

I am using python to control a picoscope. I am wondering how to set the number of bits. I know how to set the channel, the coupling, the range and the probe, like here for ex:
ps.setChannel("A", coupling="AC", VRange=0.1, probeAttenuation=1)

but how can I set the number of bits?

Thanks a lot!
JC
by jcclq
Fri Sep 10, 2021 8:23 am
Forum: Getting Started
Topic: RIN spectrum vs RMS
Replies: 1
Views: 4006

Re: RIN spectrum vs RMS

In the meantime, I tried the 'rectangular' windowing (meaning no window applied it seems), instead of the default 'Blackman', and it solved the problem. I have no discrepancy anymore.

So to display a noise spectrum, rectangular is preferrable.

JC
by jcclq
Tue Sep 07, 2021 4:10 pm
Forum: Getting Started
Topic: RIN spectrum vs RMS
Replies: 1
Views: 4006

RIN spectrum vs RMS

Hi From the spectrum measured with AC coupling and imported, I apply a transformation to get the RIN spectrum of a signal of a DC average given as V_DC. First I convert the frequency to Hz and the ChA to V. I also extract the frequency spacing Df between each point of my spectrum. Then my RIN spectr...
by jcclq
Fri Aug 27, 2021 4:18 pm
Forum: Getting Started
Topic: Spectrum dropping
Replies: 5
Views: 3505

Re: Spectrum dropping

Thanks a lot. Yes it is clear now. In my case it is 50Hz (I am based in UK). I probably have a bad contact on my BNC line. I will also make sure it is all well grounded.

This is really helpful. I didn't know I could look at the scope view as well, now I will check this!

Best regards, thanks again
JC
by jcclq
Fri Aug 27, 2021 11:04 am
Forum: Getting Started
Topic: Spectrum dropping
Replies: 5
Views: 3505

Re: Spectrum dropping

Hi

I recorded a batch of spectra in .psdata format. I attached 3 successives spectra. The middle one (#565) is the strange one, and I also attached some 'usual' spectra, the one jsut before (#564), and the one just after (#566).

Thanks for your help!
JC
by jcclq
Wed Aug 25, 2021 8:01 am
Forum: Getting Started
Topic: Spectrum dropping
Replies: 5
Views: 3505

Re: Spectrum dropping

Hi bennog

Thanks for your reply. I don't have some .psdata files right now but I'll try to record some.

Best regards
JC
by jcclq
Tue Aug 24, 2021 2:42 pm
Forum: Applications
Topic: RIN spectrum of a laser
Replies: 0
Views: 10945

RIN spectrum of a laser

Hi I am measuring the spectrum of Relative Intensity Noise (RIN) in a laser. I think I am doing the right calculation, but if someone could comment on that, it would be great. On the FFT spectrum, we get a voltage (in mV) vs frequency (in kHz). I first divide the voltage by 1000 and multiply the fre...
by jcclq
Mon Aug 23, 2021 4:03 pm
Forum: Getting Started
Topic: Spectrum dropping
Replies: 5
Views: 3505

Spectrum dropping

Hi I am acquiring a batch of spectra to calculate the RIN spectra, and I noticed that sometimes, this goes very low. I checked in oscilloscope mode, and I did not notice any drop to 0. I only noticed that sometimes I have a drop of 1%, but not sure it can explain. I used AC coupling, but of course I...
by jcclq
Thu Aug 19, 2021 10:29 am
Forum: Getting Started
Topic: Contrast ratio
Replies: 5
Views: 8096

Re: Contrast ratio

Hi I created a new line in the math channel, but then I am not sure what to do. It does not seem to plot the formula (max(A)-min(A))/(max(A)+min(A)). I don't see anything in the bottom lines ('Measurements'). To refine my question: My signal is an oscillation of varying amplitude and DC level, which...
by jcclq
Sat Aug 14, 2021 9:29 am
Forum: PicoScope 6 for Windows
Topic: Macro on spectra
Replies: 3
Views: 8196

Re: Macro on spectra

Thanks, I'll try this.
by jcclq
Sat Aug 14, 2021 9:24 am
Forum: Getting Started
Topic: Contrast ratio
Replies: 5
Views: 8096

Re: Contrast ratio

Ok thanks Gerry, I'll try that.

Best regards
JCC
by jcclq
Thu Aug 05, 2021 4:43 pm
Forum: PicoScope 6 for Windows
Topic: Macro on spectra
Replies: 3
Views: 8196

Macro on spectra

Hi all I would like to make a macro to acquire a certain number of spectra with, say, 30 seconds between them. At p. 103 of the manual, I saw it might be possible to do it with macros, in a XML script, but I don't if it is possible to have a 'FOR' loop and a WAIT function. If so, where can I find th...
by jcclq
Mon Aug 02, 2021 4:06 pm
Forum: Getting Started
Topic: Contrast ratio
Replies: 5
Views: 8096

Contrast ratio

Hi I would like to create a mathematical function from 2 measurements. I managed to display the minimum (Min) and maximum (Max) of the waveform, but now I would like to display in real time the contrast ratio: (Max - Min)/(Max + Min). I could not find in the manual how to do it, but is it possible? ...
by jcclq
Mon Jul 26, 2021 3:51 pm
Forum: Getting Started
Topic: Triggering a spectrum
Replies: 1
Views: 5986

Triggering a spectrum

Hi all I am trying to record a batch of many spectra. My system exhibits sometimes some bursts of noise, and this is what I am interested in. To do so, I would like to set a threshold on the Y-axis, so I will store only the spectra whose one frequency is above this threshold. Is there a way to do so...