DSO5202P noise CH2

amy · Post time 2017-10-31 17:04:34

Sir, in other gears, are there the noise? Or only 20mV and 5V have the niose?

amy · Post time 2017-11-1 14:54:20

Please disconnect any probes of cables to the CH1 and CH2, use another oscilloscope to compare the waveforms of the two points of CH1 and CH2 in the picture.

amy · Post time 2017-11-9 16:20:55

Sir, which picture is point1 and which picture is point2?

amy · Post time 2017-11-9 16:30:47

Please try to replace the five triodes.
D100： BAV99LT1G
Q100：SST4393-TI-E3 (or MMBF4392LY1G)
Q101：LMBTH10LT1G (or MMBTH10LT1G)
Q102，Q103：BC846B

amy · Post time 2017-11-15 08:59:06

serge73 replied at 2017-11-14 17:22
Thank you very much for your help.
I changed only three elements D100, Q102, Q103
The problem is gon ...

Sorry, I don't know much about the components.

DSO5202P noise CH2

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