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Tektronix 2235 channel 1 trace unstable

E

Evoroadster

New Member
Channel 1 trace is unstable in AC, GND or DC position. Applied signals are good but bounce around. Channel 2 is rock solid. Before I dive into this does anyone have any recommendations are where to start.
 
Operate ALL the switches and controls a few times. A tarnished contact can cause all sorts of odd effects & working the switches can clean the contacts.
 
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