Products > Test Equipment
Problem with my scope? Reading positive versus negative average DC voltages.
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?
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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.
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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)
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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.....
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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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