I have got an used Tek2225 where the basic functions seems to work. A bit of noise in the pots but when worked a bit they got a bit better but not perfect.
I have found one issue which I would like to ask if this could be a calibration issue.
When CH1 is set to GND and I use the vertical position to align the beam at the center (zero-line) and then pull the X10 vertical magnification then the beam jumps "out of the screen". I am then able to get the beam back by using the vertical position.
Doing the same with CH2 the beam does the same but here I am not able to get the beam visible again.
Could these issues be calibration problems only?
I have found one issue which I would like to ask if this could be a calibration issue.
When CH1 is set to GND and I use the vertical position to align the beam at the center (zero-line) and then pull the X10 vertical magnification then the beam jumps "out of the screen". I am then able to get the beam back by using the vertical position.
Doing the same with CH2 the beam does the same but here I am not able to get the beam visible again.
Could these issues be calibration problems only?
Does it do this regardless of sensitivity? If you zoom at 1x do you get a nice sharp waveform? Have you looked at say, a 100K square, from a known source that is nice and smooth, without ringing / overshoot?
NB - please fogive obvious, but you have swapped probes and looked at symmetry of cal oscillator?
Edit : by sensitivity, I mean vertical V-div, not.probe sens
Edit : by sensitivity, I mean vertical V-div, not.probe sens
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Yes, everything looks nice when not using the X10 vertical amplification and on CH1 the X10 signal also looks good when I adjust for the "DC offset". On CH2 I am not able to see the trace at X10. Not even when CH2 is set to GND. So far I have only used the calibration 1 kHz signal or have the input grounded.
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