Products > Test Equipment

Problem with my scope? Reading positive versus negative average DC voltages.

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tautech:

--- Quote from: Fungus on September 25, 2024, 01:49:10 am ---
--- Quote from: tautech on September 25, 2024, 12:40:11 am ---Easy to find though.....

--- End quote ---

Not THAT easy...

I found one and it isn't specified.

https://eu.mouser.com/datasheet/2/878/5992_3484-1759582.pdf

I suspect that's what this might be though.

--- End quote ---
0.5V over 20V is far more than one would expect from channel crosstalk but within accuracy spec.

Fungus:

--- Quote from: tautech on September 25, 2024, 02:03:29 am ---0.5V over 20V is far more than one would expect from channel crosstalk but within accuracy spec.

--- End quote ---

Yeah, I guess.

The next question would be does the reading change on a channel between when they're both connected to +10V and you connect the other channel to ground, not -10V.

tautech:

--- Quote from: Fungus on September 25, 2024, 06:02:30 am ---
--- Quote from: tautech on September 25, 2024, 02:03:29 am ---0.5V over 20V is far more than one would expect from channel crosstalk but within accuracy spec.

--- End quote ---

Yeah, I guess.

The next question would be does the reading change on a channel between when they're both connected to +10V and you connect the other channel to ground, not -10V.

--- End quote ---
Revisiting the OP, what one thing has the OP not done ?
 :popcorn:

Phil1977:
I´ve just checked the Rigol 1054 out of curiosity: (without probe, DC directly fed into BNC, normal sampling mode, AVG-measurement, all tests with 1V/div)



It´s not good, but it seems to follow the 1/10th-of-the-tolerance rule. I checked for DC-crosstalk with a negative voltage on Ch2 and there was nothing.

@wobbly: Is it possible your trigger is tricking you? Sometimes the 50/60Hz-hum mixes into the triggering and then it looks on the screen like a DC-offset for fast horizontal settings. May you try to set the timebase to something slower or use roll-mode?

PS: Is there a good way to copy tables from libreoffice (<=> excel) into the forum without using images?

wobbly:
I just tried this experiment at work (with completely different equipment) and got almost the exact same result!

The work scope is an old Tek 3034.

I guess I just wasn't expecting it to be such a large discrepancy.  If that's just the way I things are then so be it!

Shame it's not something that can be adjusted by the user.

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