Hi Everyone
I took delivery of an MSO2072A earlier this week, but I've run into a strange problem where the display stops updating the waveform. Does anyone recognise the problem described below? Does it sound like user error, a firmware bug, or a defective unit?
Here's the easiest way I have to reliably recreate the problem:
1) attach channel one to calibration point
2) power up scope and adjust amplitude, timebase and trigger level to get a nice view of the square wave
3) to make it easier to see when it stops, turn on frequency statistic and set to difference to get an incrementing count at the bottom of the screen
4) wait a short while, the waveform will stop updating and the counter will stop after anywhere between 4 and 200 counts.
When the waveform updates stop, adjusting any control that would change the waveform on the screen (horizontal position, vertical position, amplitude, timebase, etc.) starts the updates going again, but only for a short while.
In case this description isn't clear, I've made a short video of the problem occurring:
At the start of the video it's already got stuck after 38 counts, I press horizontal centre to start it again, it gets stuck at 59... 79... 175... 182... 220.
As you can probably imagine this makes the scope near useless, as when I'm probing around a circuit I've now way of knowing if the scope is showing me what's on the end of the probe or whether it's stopped updating the screen.
Thanks in advance for any suggestions, I'm hoping I can get past this problem without needing to send the scope back.