Products > Test Equipment

SDS1104X-E DC offset in AC coupling

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pope:

--- Quote from: BillyO on April 04, 2023, 04:09:24 pm ---
--- Quote from: pope on April 04, 2023, 03:00:54 pm ---What is the VGA configuration?

--- End quote ---
Variable Gain Amplifier.  They are used in the front ends of scopes (and possibly other places)..

https://www.ti.com/lit/gpn/lmh6518

--- End quote ---

Thank you. So, what sort of improvement should we expect by this update/ optimisation?

I'm just a bit nervous to update the o'scope in case it messes up with the offset as already mentioned...

BillyO:
Not sure why they would do it.  Maybe gain sets were off a little.

Bionicbone:
And is this VGA only related to the hardware 09 issue as per previous update?

Deso:

--- Quote from: BillyO on April 04, 2023, 04:09:24 pm ---Variable Gain Amplifier.  They are used in the front ends of scopes (and possibly other places)..

https://www.ti.com/lit/gpn/lmh6518

--- End quote ---
Ha, you're fast. I read tons of posts of @TV84 so I could dig deeper and found that the VGA chip must be the LMH6518 (which by the way has the ability to limit the input bandwidth programmatically).

BillyO:

--- Quote from: Deso on April 05, 2023, 07:42:27 am ---Ha, you're fast.

--- End quote ---
Well, maybe, but in this case I can't take credit.  I saw the teardown that Dave did on it.  The VGA was pointed out in that vid.

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