A while ago I posted a screenshot from my Keysight DSOX1102G and someone mentioned how fuzzy the trace looked.
I've only been using this scope for audio related stuff with BW limit on and sometimes analyzing MIDI and SPI so the noise wasn't really evident. I had never even seen a digital scope before this one so everything looks noisy compared to my old Hameg analogue scope.
Last week I built a circuit that outputs a small 18mV signal and saw how horrible the signal is on my scope once I zoomed in. I don't know if it worked correctly when I first got it but I'm assuming I must have at least looked closely at the square wave signal coming from the Probe Comp output in the first few days I owned it.
SO,
can anyone with a Keysight 1000X series scope show me what it's supposed to look like? I even brought my scope to another house to make sure it wasn't something originating from the houses mains power.
Look at all these spikes (you can see a repeating pattern if you zoom out) with a 10X probe and the vertical set to 10mV looking at the bottom of the square wave coming from the Probe Comp output.
The same noise happens with the probe connected to nothing or looking at a signal from a little DDS function generator and the smaller spikes go down if I touch my hand to the LCD of the scope but the bigger ones don't change.
The smaller spikes repeat at 520kHz and the bigger ones at about 71kHz but sometimes it's around 140kHz.
The strangest thing I've found about the big spikes is that if I turn on Cursors and move one, I get exactly the same big spike that follows the cursor just a few pixels to the right of it. I wonder if the screen on this scope or something in the front panel is messed up?
After lots of confusion with my scope's serial number not being in their system I eventually go one of the probes replaced because it was defective right out of the box but this is quite a different situation.