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Tektronix THS7xxx Scope Hack/Teardown/Discussion - FW 1.16 found

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harrimansat:

--- Quote from: r_anton on January 18, 2021, 08:35:19 am ---
--- Quote from: harrimansat on January 17, 2021, 07:20:26 pm ---I will test with mine, can you please upolado some photos, whic is noise frequency?

--- End quote ---

Hello

These are the photos without and with probe
FV:v1.14

Thanx for reply

Do you have more noise without probe?

--- End quote ---

r_anton:

--- Quote from: harrimansat link=topic=35004.msg3419836#msg3419836 ---
Do you have more noise without probe?


--- End quote ---

a little bit more without probe and it has a kind of periodic type, with probe it become random. What is strange, like on the second foto, I don't see on the wave form measured peak-to-peak value of 23mV (often it's 40mV)

harrimansat:

--- Quote from: r_anton on January 18, 2021, 09:59:05 am ---
--- Quote from: harrimansat link=topic=35004.msg3419836#msg3419836 ---
Do you have more noise without probe?


--- End quote ---

a little bit more without probe and it has a kind of periodic type, with probe it become random. What is strange, like on the second foto, I don't see on the wave form measured peak-to-peak value of 23mV (often it's 40mV)

--- End quote ---

Can you please make the same test in AC, and GND, and then shorted?

r_anton:

--- Quote from: harrimansat on January 18, 2021, 10:19:13 am ---Can you please make the same test in AC, and GND, and then shorted?

--- End quote ---

Of course, thanx for helping

harrimansat:
Mine has the same behaviour:

If scope don“t meassure nothing with shorted inputs, it usually means it's ok.

Think that this scope has isolated gnd and it has more noise when then are not connected

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