So I've got the Siglent SDS1104X-E that Dave showed doesn't have the HF Reject; what are my options when I see this? Some kind of filtering on the probe?
Just raise the trigger level
It DOES have HF reject... Just not where Keysight has it. It's not in the same menu..
Manuals are available, shame nobody reads them..
Is HF Reject for the displayed signal the same as HF Reject for the trigger, though? (Perhaps if the scope gets the trigger from the displayed signal...)
You have selectable "BW Limit" (a 20 MHz low pass filter) for input channel and in Trigger Coupling you can choose:
DC: allow DC and AC components into the trigger path.
AC: block all the DC components and attenuate signals lower than 8 Hz. Use AC
coupling to get a stable edge trigger when your waveform has a large DC offset.
LF Reject: block the DC components and reject the low frequency components lower
than 2 MHz. Low frequency reject removes any unwanted low frequency components
from a trigger waveform, such as power line frequencies, etc. that can interfere with
proper triggering. Use LF Reject coupling to get a stable edge trigger when your
waveform has low frequency noise.
HF Reject: reject the high frequency components higher 1.2 MHz)
You would use "BW Limit" to intentionally make your scope 20 MHz scope and filter out higher frequencies because you don't even want to see them on the screen. You wan't to ignore them completely. You would use that, if, for instance, you have a known interference source, you know it's not your problem and you just want to concentrate on your signal.
You would Trigger coupling filtering (both HF and LF reject) to keep looking at full signal with all components and full frequency range, but want to trigger on a specific part of it.
As I said many times before, even the cheapest scopes have many triggering options that only 10 years ago you had to buy mid range scope to get it. Cheap Rigols, Siglents, MicSigs, Gw Insteks are good enough for large percent of usual scope work. Their more advanced models are even much more than that..
Biggest problem I see with people using B brands is expectation they will work exactly the same as their favorite A-brand ( i.e. they expect Siglent or Rigol will have exactly the same naming and have exactly the same menu layout, which they won't) so instead of learning new ways, they proclaim cheap instruments "stupid" and insist that, for instance, "Keysight has best layout" while it is only familiarity of using their equipment for 20 years... Or simply make false statements like "this instrument doesn't have XYZ" because it's not where they expect it and don't even bother to check if that is true. And then, when corrected, they attack back with " if it weren't stupid it would be here where it should be..", and back to square one.
I've seen this with musical instruments for years, where musicians would wax poetic about all kinds of keyboards, guitars, effects, amplifiers.. Instead of practicing playing and making music, which might make them better musicians, they waste time talking.
Take Chick Corea and give him cheapest, tuned, functional upright piano, and take mediocre player and give him the most expensive Yamaha Grand Piano.. Guess which one will make more beautiful music...