Hello, I have a UTD2025CL digital storage oscilloscope. In this thread I want to post a few questions regarding this oscilloscope.
1. Is the wave form from the attached screenshots normal ? - I measured this on the output of a simple TL431 shunt regulator, which has 5V output.
2. When measuring ripple voltage across power supply output, the trigger notifications show fast switching between "Trig'd" and "Armed" - is this normal ?
The screen shot utility of the scope is suspect as they are not in persistence mode and the scope appears to be in continuous mode so, I would think the scope would only show a single trace not multiple ones. At least that is what all the Tektronics DSO (and an HP) I've used do. The only way on those brands to get multiple traces is to run it in persistence mode and then do a screen capture after it's run for a while (it's how I've gotten eye diagrams for high speed transceivers signals).I think what you are seeing is not one trace but several similar traces appearing to overlap. There is only one trace at a time but it is repeating rapidly and giving the impression of a more complicated waveform. If you change to single sweep mode you will see only one trace before having to manually reset it, it should make it easier to understand.
The traces look absolutely normal to me and it is to be expected that some residual signals will be seen when the sensitivity is set so high. What looks big on the trace is actually very small in reality.
The trigger/armed is also quite normal, it is armed until triggered and the trigger will occur when the height of the trace exceeds the trigger level threshold. If you switch to single sweep mode it will disable re-triggering so you see how the triggering process works.
Brian.
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