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JYE Tech Forum • View topic - FREQ. METERING DSO 068
Page 2 of 2

Re: FREQ. METERING DSO 068

PostPosted: Tue Jan 26, 2016 12:29 am
by jye1

Re: FREQ. METERING DSO 068

PostPosted: Wed Jan 27, 2016 1:43 pm
by termin
Problems with overrun in display Test signals in Osscilloscope mode solved,before was "too much", in place C5 and C8 new two
5pf to 50 pf trimmers good working, I have 100% signals.

Re: FREQ. METERING DSO 068

PostPosted: Thu Feb 18, 2016 6:35 pm
by staceygeek
I have successfully solved this problem by replacing C7 with 100pF after this was done adjusting C8 trimmer changed the waveform of the test signal. I also replaced C5 trimmer with 22pF cap and got a good square waveform of the test signal. Maybe it helps somebody.

Re: FREQ. METERING DSO 068

PostPosted: Fri Feb 19, 2016 5:37 pm
by staceygeek
Just in case somebody wants to know the range of FC. My DSO068 measures frequency with accuracy 1Hz up to 8,2MHz. Above that the readings are inaccurate. There is TL082 opamp in the input circuit. It can has a bandwidth up to 3MHz, maybe replacing it with LM6172 (bandwidth up to 100MHz) can increase the range of FC up to 15MHz? The bandwidth cannot exceed the limitation of TLC5510 A/D converter (16MHz) anyway.

Re: FREQ. METERING DSO 068

PostPosted: Fri Mar 06, 2020 4:25 pm
by jaxllax
seguro son defectuosos c5 , yo tuve el mismo problema y resolvĂ­ cambiando c5