PicoScope 7 Software
Available on Windows, Mac and Linux
Yes, rehab is the key. I am spending 1 1/2 hours a day at her care facility (she is 94 with dementia) walking with her. She complains a lot, but as you mention, getting her mobility back is critical to maintaining her quality of life.Gerry wrote: ↑Thu Apr 25, 2019 8:57 amCoincidentally, my mother did exactly the same thing a number of years ago and had to have a replacement. The most important thing that I learned from was that was that the rehabilitation (physio-therapy) after that is so critical to getting them back to their mobility (even if they don't have much enthusiasm for it), because it can be key to maintaining their quality of life, so I'm sure it was time well spent.
Hi Gerry,Gerry wrote: ↑Mon Apr 29, 2019 3:55 pmHi Dan,
Have you corrected for Process gain (I couldn't find any reference to it any of your links)?
If not then go here to find out how to correct your data: topic25101.html?&p=86081&hilit=process+gain#p86081
Regards,
Gerry
Gerry wrote: ↑Wed May 01, 2019 1:10 pm...
However, if you are making the measurements w.r.t. 1mW dissipated into a load for dBm, and your load is 50Ω then you need to make the necessary correction to the measurement, in particular, if you want to use a voltage reference then the ref for a 50Ω load will be √(50 * 0.001) = 0.2236V. So, my measurement of the terminated PS4262 input channel in Spectrum Mode should now give a level of:
20Log(5.1*10^(-6)/0.2236) = -92dBm - the process gain of 42dB giving a grand total of -134dBm (which is where the missing 10db that you mentioned are), and is what you will see (or almost) in the attached screenshot of the same measurement, and the data file for it.
dnessett wrote: ↑Tue Apr 30, 2019 12:33 amNevertheless, you raise a legitimate point. Considering the PicoScope in isolation and comparing it with the figure of -95 dBm you quoted as the noise floor of the 4262 requires taking processing gain into consideration. I used 262,140 samples when capturing the spectrum that I displayed above. This represents 10 Log (262,140 / 2) = 51.175dB of processing gain. Ignoring the first two bins (which have abnormally high dBm values, -38.766 and -49.510, not sure why), the maximum for the spectrum is -90.509 dBm and the minimum is -115.20 dBm.
...
The last plot is closer to the result you gave, but still not quite on the mark. In particular, the minimum and maximum of the processing gain corrected data (ignoring the first 3 bins) is -93.158 dBM and -62.445 dBm. I used the movable ruler to measure the middle of the non-corrected noise plot and it equaled about -139 dBm, which corrected for processing gain is -87.825 dBm.
Gerry wrote: ↑Wed May 01, 2019 1:10 pmGoing back to your previous post where you mentioned that you couldn't select Primary or Secondary view I'm not sure whether you were referring to selecting a second viewer, or deciding which of the second viewers is Primary and which is Secondary, but you just need to go to the 'Views' menu and select 'Add view' and select the type of view you want to add. The Secondary View will then be the view that you are adding to the already existing Primary View. I have run PicoScope 6 on Ubuntu, and done exactly that with the same 50 ohm terminated test to very similar results again, as you can see in the attached Screenshot.