When using the PicoScope 4224 in Spectrum Mode I am measuring the downstream power of an ADSL line at the DSLAM. I am bridge on to the cable pair and so far everything looks normal when the Spectrum Range is set to 2 Mhz
Even when I change the Spectrum Range to 1Mhz, it still looks quite normal
The problem is when I reduce the range lower, I see an error in the presentation.
The pictures will explain it all.
I grabbed another Spectrum Analyzer to compare, and regardless of the ragne I use on it, I always see what I would expect as in the ADSL_2Mhz.gif. Even when I reduce the range to 100Khz.
This is not good, any help will be greatly appreciated.
thanks in advance