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My signal generator has 600 ohms in its internal output impedance (Picoscope 3204B). The BNC cable at my hand is 50 ohms, so is there any problem with the impedance mismatch? If yes how can I workaround that?

Neil_UK
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settimed
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  • What's the signal frequency? – Jonathan S. Jan 10 '22 at 20:17
  • One easy way would be to use a 600:50 transformer. Ferrite is preferred, for size and speed reasons. – rdtsc Jan 10 '22 at 20:29
  • The signal freq range is between DC and 1MHz – settimed Jan 10 '22 at 20:30
  • The wavelength of a 1 MHz signal traveling in the polyethylene dielectric of the coax is about 200 m. – davidmneedham Jan 10 '22 at 20:31
  • @davidmneedham, so if I understand you correctly it will be an issue in the signal integrity if I employ an RG-58 cable with 24" length – settimed Jan 10 '22 at 20:40
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    A rule of thumb is that you don't need to consider transmission line effects when the length of your transmission line is less than 1/10th the length of the wavelength of the signal. So for a coax less than a meter long and a frequency of 1 MHz, I wouldn't worry about impedance matching of the coax. See https://electronics.stackexchange.com/questions/143541/impedance-of-waveguides-shorter-than-1-10-of-wavelength – davidmneedham Jan 10 '22 at 20:45
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    1 MHz maximum frequency, but 1 MHz sine wave or 1 MHz square wave? The square wave contains much higher frequencies than the sine wave. – Justme Jan 10 '22 at 21:02
  • @Justme, I agree with you. 1MHz for any standard signal including square waveform. – settimed Jan 10 '22 at 22:13

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