Products > Test Equipment
Should I buy a Rigol MSO5000?
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Fungus:

--- Quote from: dietert1 on October 24, 2022, 02:11:31 pm ---For me the aliexpress link results in an error page "Leider ist dieser Artikel an Ihrem Standort derzeit nicht verfügbar. Entdecken Sie weitere Gruppenkaufangebote."
Would you write down a sentence what you mean, like bandwidth, gain, supply options?

--- End quote ---

I get this:


There's hundreds of sellers with that amplifier though, just search for "40db broadband amplifier"

Specs:

dietert1:
Thanks. So you were using that one?
It is spec'd for 60 dB, that is G=1000 and bandwidth 30 .. 4000 MHz. In your scope screen you were using it at 8 MHz (out of bandwidth) and at a gain of about 70. Maybe not the best solution for a scope, where we want to preserve the input signal shape.
Also one might want a preamplifier that can be used with the usual scope probes. These amplifiers are 50 Ohm RF systems. Does the Rigol support 50 Ohm input termination?

Regards, Dieter
Fungus:

--- Quote from: dietert1 on October 24, 2022, 03:14:16 pm ---Thanks. So you were using that one?
It is spec'd for 60 dB, that is G=1000 and bandwidth 30 .. 4000 MHz. In your scope screen you were using it at 8 MHz (out of bandwidth) and at a gain of about 70. Maybe not the best solution for a scope, where we want to preserve the input signal shape.
Also one might want a preamplifier that can be used with the usual scope probes. These amplifiers are 50 Ohm RF systems. Does the Rigol support 50 Ohm input termination?

--- End quote ---

Looking at millivolt signals with ordinary probes probably won't work well on any oscilloscope. It's usually done in 50-Ohm terminated systems.

FWIW: The MSO5000 doesn't have internal 50Ohm termination.

The proposed solution would only be for occasional use. If looking at mV signals is a central part of what you're planning to use your oscilloscope for then maybe you need to look at a 12-bit "HD" oscilloscope.
dietert1:
We have a Rigol DS2202E and it has the 50 Ohm input termination. Anyway that's half the story. The preamplifier input should also be switchable between high impedance and 50 Ohm.
Certainly if a scope doesn't pick a signal because it is to small, a preamplfier will have a similar problem.
Sometimes i found snap-on ferrites on scope probes useful when using digital scopes. Or feed the probe cable through a ferrite ring core multiple times in order to reduce common mode noise into the ground clip impedance.

Regards, Dieter
tautech:

--- Quote from: Fungus on October 24, 2022, 01:53:19 pm ---Whether or not it's a problem depends on how often you need to look at this sort of signal...

nb. Siglents don't go down to microvolts either. If low very level signals are what you do all day long then you're going to need the amplifier no matter what 'scope you own.  :-//

--- End quote ---
Best you refresh your thoughts on this matter here:
https://www.eevblog.com/forum/testgear/is-a-rigol-mso5000-overkill-for-a-hobbyist/msg4481968/#msg4481968
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