| Products > Test Equipment |
| Problem with my scope? Reading positive versus negative average DC voltages. |
| << < (3/6) > >> |
| 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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