Search found 51 matches

by dnessett
Thu Oct 18, 2018 11:58 pm
Forum: Getting Started
Topic: Picoscope saving multiple csv files for spectrum
Replies: 11
Views: 4139

Picoscope saving multiple csv files for spectrum

Hi, I am saving a large spectrum plot (2 MHz span with 1,048,576 bins) and have discovered that the picoscope software is creating 7 files of about 46 MB each. I am not suggesting this is incorrect behavior. I am just wondering what each file contains. It appears that the first column of each file i...
by dnessett
Thu Oct 18, 2018 8:35 pm
Forum: Getting Started
Topic: Spectrum Analyzer dBm doesn't correspond to Vp-p
Replies: 10
Views: 2537

Re: Spectrum Analyzer dBm doesn't correspond to Vp-p

Hi Gerry, Don't worry about the "hasty reply". These things happen. The "Arbitrary dB" selection is there on the Linux version, but it doesn't allow the specification of the resistance value. What I have decided to do is specify linear for the y axis and download a CSV file of the data. I then will ...
by dnessett
Thu Oct 18, 2018 8:26 pm
Forum: Getting Started
Topic: Spectrum Analyzer dBm doesn't correspond to Vp-p
Replies: 10
Views: 2537

Re: Spectrum Analyzer dBm doesn't correspond to Vp-p

Hi Martyn,

The unix version allows the selection of logarithmic units and specification of dBm. However, it doesn't support the specification of the termination resistance.

Cheers,

Dan
by dnessett
Thu Oct 18, 2018 3:05 pm
Forum: Getting Started
Topic: Spectrum Analyzer dBm doesn't correspond to Vp-p
Replies: 10
Views: 2537

Re: Spectrum Analyzer dBm doesn't correspond to Vp-p

Hello Martyn,

Thanks for the reply.

I am running Picoscope 6 Beta (6.13.7.707) on Centos 7. The option you show does not appear in the Spectrum Options in that version.

Dan
by dnessett
Wed Oct 17, 2018 8:36 pm
Forum: Getting Started
Topic: Spectrum Analyzer dBm doesn't correspond to Vp-p
Replies: 10
Views: 2537

Re: Spectrum Analyzer dBm doesn't correspond to Vp-p

Hi Gerry, Thanks for responding. I see now that the problem is the Picoscope software assumes 600 ohm termination, whereas I am using 50 ohm termination. That is where the discrepancy arises. Specifically, Power(in mW) = 1000*(Vrms^2)/R, which in the 50 ohm case is: = 1000*((.03535)^2)/50 = .025 mW ...
by dnessett
Tue Oct 16, 2018 10:55 pm
Forum: Getting Started
Topic: Spectrum Analyzer dBm doesn't correspond to Vp-p
Replies: 10
Views: 2537

Spectrum Analyzer dBm doesn't correspond to Vp-p

Hello, I am new to Picoscope, just receiving my 4224 today. However, I am not new to spectrum analyzers. I am interested in low frequency spectra (1Hz - 200 KHz), so began testing the spectrum analyzer with low frequency signals. Specifically, I connected a Rigol DG1022 sourcing a 10 Hz signal with ...