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Author Topic: How much noise is normal with a TDS7104  (Read 2866 times)

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Offline Its meTopic starter

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How much noise is normal with a TDS7104
« on: August 22, 2021, 09:10:44 pm »
Hello experts,
without a probe, the oscilloscope will show this noise.


Is that normal?
Regards
 Its Me
« Last Edit: August 22, 2021, 09:47:41 pm by Its me »
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Offline Johnny10

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Re: How much noise is normal with a TDS7104
« Reply #1 on: August 22, 2021, 09:57:12 pm »
Mine shows 1.1-2.2 mV peak to peak.
Just after start-up

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Offline Specmaster

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Re: How much noise is normal with a TDS7104
« Reply #2 on: August 22, 2021, 10:14:50 pm »
Depending on what the settings are on the inputs, yes it is normal.
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Offline RolandK

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Re: How much noise is normal with a TDS7104
« Reply #3 on: August 23, 2021, 05:15:39 am »
Your scope is broken - give it to me  8)


To see the noise of the scope you should prevent any pickup with an open input, short the input or put a 50 Ohm Termination on it. And no wire loop...
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Offline Its meTopic starter

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Re: How much noise is normal with a TDS7104
« Reply #4 on: August 23, 2021, 10:28:04 pm »
Quote from: RolandK on August 23, 2021, 05:15:39 am
Your scope is broken - give it to me  8)
Das könnte Dir so passen  :)

Even with short-circuited inputs, the noise does not change.
When I connect the probe to ground nothing changes in the noise.
A connection to Probe Compensation provides this result.

I suspected that the capacitors were failing on my TDS7104.
My Tektronix TDS 684A oscilloscope that was not used for 9 years
also showed this noise. Shortly afterwards it was broken.
As it turned out, many capacitors on the TDS 684A have leaked.

If the noise on the TDS7104 is normal, I don't need to worry.
« Last Edit: August 23, 2021, 10:30:09 pm by Its me »
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