Products > Test Equipment

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

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bdunham7:

--- Quote from: wobbly on September 24, 2024, 08:19:35 pm ---Good idea.  My Fluke 117 reports 10.1V (stable) measured with Fluke's GND probe on the benchtop PSU's GND and the positive probe on the Scope's sig-gen GND BNC outer metalwork.  This checks out, since the Scope probes GND clips are sharing the virtual GND of the bipolar supply.

--- End quote ---

This is not adding up for me.  Are the ground clips of both scope probes connected to the PSU GND connection?  If not, can you quickly draw out a schematic of exactly how you have everything connected?

Fungus:

--- Quote from: Phil1977 on September 24, 2024, 09:23:56 pm ---It may be in spec, but are the scopes really that bad?

--- End quote ---

Yes. Scopes are accurate horizontally, not vertically.

I expect them to be linear but vertical numbers on 'scopes are a ballpark figure.

Fungus:

--- Quote from: tautech on September 24, 2024, 09:12:20 pm ---
--- Quote from: Phil1977 on September 24, 2024, 09:04:25 pm ---I agree that 3% deviation would be more than expected for a reputable scope.

--- End quote ---
Cough.

+ 3% vertical accuracy has been industry standard for decades but now improved near 10x with the advent of cheap 12bit DSO's.

Spec from the datasheet for the DSO OP uses is:
DC vertical gain accuracy:
+3% full scale (≥ 10 mV/div)
+4% full scale (< 10 mV/div)

--- End quote ---

What's the spec for crosstalk between channels?

tautech:

--- Quote from: Fungus on September 25, 2024, 12:36:00 am ---
--- Quote from: tautech on September 24, 2024, 09:12:20 pm ---
--- Quote from: Phil1977 on September 24, 2024, 09:04:25 pm ---I agree that 3% deviation would be more than expected for a reputable scope.

--- End quote ---
Cough.

+ 3% vertical accuracy has been industry standard for decades but now improved near 10x with the advent of cheap 12bit DSO's.

Spec from the datasheet for the DSO OP uses is:
DC vertical gain accuracy:
+3% full scale (≥ 10 mV/div)
+4% full scale (< 10 mV/div)

--- End quote ---

What's the spec for crosstalk between channels?

--- End quote ---
Dunno, a while ago closed the datasheet tab.
Easy to find though.....

Fungus:

--- 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.

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