Re: phony 50
input select yes, it would be wonderful if the thing could stand for a spectrum analyzer, but that would take a lot more than convenient display units. The FFT mode correctly offers dBVrms units. If you know that you have installed an external terminator (and why), you should also be able to add 13. In the meantime, channel input "Impedance" select is clearly indicating real physical input impedance, and is simply wrong.
Couple more strange behaviors other owners may wish to confirm:
- In "math" you can select channels 1 and 2 as operands ("Source") A and B. But if you scroll to select operations it *sometimes* spontaneously changes both operands to channel 2. When it does this, the soft keys at screen bottom still display the channel assignments originally selected, but the on-screen "MATH" text shows the erroneous operation. Based on signals I fed in, that indeed appears to be what it's displaying. Manually re-selecting the channel for one of the Sources appears to resolve it for the moment; but if you then change the math operator again, it's a crapshoot.
- The manual (page 133) indicates one can do math against internally saved Reference waveforms. But only channel 1 and channel 2 are offered as operands, even if Ref A and Ref B have been saved with valid waveforms.
- Under "acquire" menu page 2/2 there is a softbutton "Acq Mode" appearing next to the "Interpolation" select. This gives two options, "Slow" and "Fast". "Slow" appears to make the screen update jerky. Nothing shown in the manual (although mystery button does appear in Figures 12 and 13). Onscreen help says: "Fast: Enable hardware accelerated view. Slow: Disable hardware accelerated view." Any clues why this option is offered, or how it might be useful?
Once again:
Software version: 5.1.3.8
FPGA version: 2017-03-21
Hardware version: 00-01
Product type: SDS1202X-E