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DC bias (or offset) adjustment availability

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taydin:
The Rigol DHO4000 has a DC bias feature in the front end, where a voltage offset can be specified, which will then be subtracted from the input signal. This is a god sent feature for ripple and noise analysis in power supplies, and normally requires expensive power measurement probes that have built in DC offset adjustment. Here in the forum, I am seeing people talk about this feature being available in Siglent scopes as well, but I have looked into the mauals of several models and I can't see this feature being present. The only offset is the regular screen display offset, which is available in pretty much all scopes. So, is this DC bias thing a unique feature of the Rigol DHO4000 only?

alm:
Having separate DC offset and vertical position controls is also common on all but the entry-level Tektronix scopes. I believe that Siglent, like Lecroy, couple DC offset to the vertical position knob. So turning the vertical position knob changes the DC offset in the vertical amplifier, or in an active probe that allows controlling the offset from the scope.

Look at the DC offset range of those scopes which will be much larger than the vertical position range on the Rigol.

taydin:
I'm looking at the channel controls of my SDS1104X-E. There is a DC offset configuration for each channel, but it is tied to the vertical position control knob. I had a Keysight DSO9104A and this scope didn't have a distinct DC offset configuration, either, only vertical position. So if this is so common, can you tell me a scope other than DHO4000 that has separate DC offset for the front end and separate vertical position control?

alm:
Like I said, it's common on all but entry-level Tektronix scopes, like the TBS-2000b series for example. Even my old Tek TDS-3000 scope has offset adjustment separate from the vertical position. Their lowest end scopes may not have offset adjustment at all. I'm not sure about the TBS-1000 series for example.

It's a design philosophy thing, like having one vertical knob per channel vs a shared knob. The other scopes like Siglent do have a way to adjust offset, it's just controlled differently.

Fungus:
The Rigol DHO800 has it too.

(and all the rest of the DHO range...)

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