Author Topic: Hameg 103 oscilloscope  (Read 238 times)

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Offline gearheadgeek

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Hameg 103 oscilloscope
« on: October 21, 2019, 07:23:32 pm »
Hello EEVblog Im a long time reader and now a first time poster. I have acquired a Hameg 103 10 mhz scope and I cleaned it up and checking it over and went to calibrate the scope and probe and read the manual after downloaded it and by no means am i pro at this I just like to tinker and I run into a issue I have never seen before the instruction  says to set the scope to 5 mv Y-AMPL and the timebase to 0.2 ms and should get about 4cm taken on the screen thats  right but my traces are fat and when i press on the case they become normal. Im gong to try to include a video if i can. some help in the right direction would be most helpful https://youtu.be/ZTfveKgK22w
I put a link to youtube I dont know if i can do this so please forgive in advance
 

Offline james_s

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Re: Hameg 103 oscilloscope
« Reply #1 on: October 21, 2019, 07:54:59 pm »
I can't view the video, it says it's private.

If pressing on the case causes the trace to change then it sounds like you have a bad connection somewhere, I can't really tell you more without knowing more details.
 

Offline gearheadgeek

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Re: Hameg 103 oscilloscope
« Reply #2 on: October 21, 2019, 08:23:37 pm »
Hello james try it again  I think i change my youtube correctly that was the very first video i uploaded i unchecked all the settings i think
 

Offline shakalnokturn

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Re: Hameg 103 oscilloscope
« Reply #3 on: October 21, 2019, 10:50:23 pm »
Looks like a weak contact somewhere on the focus adjustment.
Study schematic to get some idea of what components are involved, remove cover then try to figure-out which of those components get mechanical stress once you push down.
Also try prodding around with a dry chopstick.
Beware high voltage.
 
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Offline james_s

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Re: Hameg 103 oscilloscope
« Reply #4 on: October 21, 2019, 11:16:18 pm »
I strongly suspect you've got a cracked solder joint in there and pressing on the case is flexing the PCB. You're gonna have to open it up and see what you can find.
 
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