Wrong voltage dysplay

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vadim_klimov
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Wrong voltage dysplay

Post by vadim_klimov » Thu Nov 07, 2019 7:55 am

I 'm new here and have little knowledge of thing. I have an pulse generator and would like to measure the signals with PicoScope. I have set the voltage of signal to 1V and can see that in analog oscilloscope as well. But picoScope shows me always 2V. What could be the cause?
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Martyn
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Re: Wrong voltage dysplay

Post by Martyn » Thu Nov 07, 2019 11:25 am

What is the output impedance of the pulse generator, and what is the input impedance of the analog oscilloscope ?
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vadim_klimov
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Re: Wrong voltage dysplay

Post by vadim_klimov » Thu Nov 07, 2019 12:39 pm

Output impedance of the pulse generator is 50 ohms, and the input impedance of the analog oscilloscope is 50 ohms too.
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Martyn
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Re: Wrong voltage dysplay

Post by Martyn » Thu Nov 07, 2019 1:05 pm

As our scopes have a 1 MOhm input impedance you would read a 1V output from a 50 Ohm pulse generator at around 2V.
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vadim_klimov
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Re: Wrong voltage dysplay

Post by vadim_klimov » Thu Nov 07, 2019 1:22 pm

Oh, sorry, i founded it. I must select 50 ohms dc
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