DSO138 - No trace.

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dikidera
Posts: 1
Joined: Sat Jun 16, 2018 5:23 pm

DSO138 - No trace.

Post by dikidera »

Vin=12.2v
-AV=-4.97
+AV=5.00
+3.3=3.3
+5.0=5.0
+V=11.4
-V=-26.5(very high????)
V1=0V(CPL at GND)
V2=3.6V(CPL at GND)
V3=3.67V(CPL at GND)
VGEN=0.8v

I assembled the kit myself, so I must have done something wrong. The only time any sort of trace appears on the screen is when CPL=AC,SEN1=10mv,SEN2=x1 and I place the red probe on the test signal or my finger. Basically it only works when SEN1=10mv, ANYTHING HIGHER or any other setting, and the signal disappears(no trace).
jye1
Posts: 1227
Joined: Wed Feb 20, 2013 4:58 pm

Re: DSO138 - No trace.

Post by jye1 »

V- was pretty high. This might indicate its loading was light. V2 was not good. Check soldering and components of V2 stage to fix this stage first.
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