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| JohanH:
--- Quote from: marck120 on February 03, 2022, 12:47:10 pm --- Ok I understand, I was confused by the acronyms I should go from alternating to direct voltage DCV (Direct Current Voltage) direct voltage ACV is the alternating voltage (Alternating Current Voltage, Alternating Current Voltammetry) --- End quote --- English has an inconsistent use of acronyms related to electrical units and quantities. SI standard symbol for electrical voltage is V (IEC standard uses U, which is better to not mix quantity with unit) and electrical current I. Units are volt (V) and ampere (A) (note lowercase letters when units are spelled out). English is also different because it uses the same name both for unit and quantity (volt/voltage). Now there are no good standardized symbols to indicate alternating or direct voltage or current, so I understand why there are various ways to express that. But ACV/ACA/ACI/DCV/DCA/DCI are just plain silly and confusing symbols. Better to use plain units (V and A) and symbols like ~ and ⎓ instead of this mishmash. |
| Niwivan:
--- Quote from: mqsaharan on February 03, 2022, 05:03:52 am --- --- Quote from: marck120 on February 02, 2022, 08:19:35 pm ---Hi, a few months ago I bought the Brymen 257s, I noticed an anomalous thing, short-circuiting the leads should immediately go to 0, this does not happen, do you think the multimeter has some problem ? https://youtu.be/wX4Cy5j68Ho --- End quote --- There is no need to worry. Your meter is fine. In the video you linked, the meter is in ACV function. BM257s is TrueRMS meter. It is normal behaviour for such a meter in ACV function. In DCV function, it should go to zero immediately. --- End quote --- I have several multimeters including the BM257S here. Actually it seems strange to me too ... In DCV it is ok and it is always 0, but by orthocircuiting the leads in ACV the BM257s still remains above 0. My other multimeters such as UT61E +, short-circuiting the leads in ACV, the display stops showing values fluctuating and everything becomes 0. They are both two TRUE-RMS multimeters ??? :-// |
| marck120:
--- Quote from: jukk on February 03, 2022, 03:03:20 pm --- --- Quote from: marck120 on February 03, 2022, 12:47:10 pm --- Ok I understand, I was confused by the acronyms I should go from alternating to direct voltage DCV (Direct Current Voltage) direct voltage ACV is the alternating voltage (Alternating Current Voltage, Alternating Current Voltammetry) --- End quote --- English has an inconsistent use of acronyms related to electrical units and quantities. SI standard symbol for electrical voltage is V (IEC standard uses U, which is better to not mix quantity with unit) and electrical current I. Units are volt (V) and ampere (A) (note lowercase letters when units are spelled out). English is also different because it uses the same name both for unit and quantity (volt/voltage). Now there are no good standardized symbols to indicate alternating or direct voltage or current, so I understand why there are various ways to express that. But ACV/ACA/ACI/DCV/DCA/DCI are just plain silly and confusing symbols. Better to use plain units (V and A) and symbols like ~ and ⎓ instead of this mishmash. --- End quote --- Thanks for the explanations, I agree, in fact at the beginning I did not remember the meaning of the acronyms ACV and DCV, then I always make a lot of confusion. However it remains a mystery, a friend who has other digital multimeters short-circuiting the leads marks zero, they explained to me that there is probably an internal adjustment for compensation. |
| rsjsouza:
--- Quote from: marck120 on February 02, 2022, 08:19:35 pm ---Hi, a few months ago I bought the Brymen 257s, I noticed an anomalous thing, short-circuiting the leads should immediately go to 0, this does not happen, do you think the multimeter has some problem ? --- End quote --- As others have said, the True RMS takes a while to settle - not to mention it can be also noisy and thus give a reading other than zero even with the probes shorted. I don't have the BM257S, but its little brother BM251S (Greenlee DM200A), which is not a TRMS but averaging and it settles faster due to this. Check the attached video for reference (rename from .zip to .mkv) |
| bdunham7:
--- Quote from: marck120 on February 03, 2022, 04:27:17 pm ---Thanks for the explanations, I agree, in fact at the beginning I did not remember the meaning of the acronyms ACV and DCV, then I always make a lot of confusion. However it remains a mystery, a friend who has other digital multimeters short-circuiting the leads marks zero, they explained to me that there is probably an internal adjustment for compensation. --- End quote --- The slowness of the display to get to its ultimate low value is called 'settling time'. The minimum number of counts displayed with the leads shorted for a long time is called 'residual counts'. That's all assuming that there aren't fields present causing actual voltages on the shorted leads. It may seem odd and would take a while to explain, but 'better' TRMS meters typically end up having a bit longer settling time and some residual counts. This is just a characteristic of the type of converter used and its bandwidth. It can be annoying and in many cases, users would actually be better off with an average-responding meter than TRMS. However, I can assure you that your meter is not broken and appears to be performing to spec. You shouldn't really compare it that way with other makes and models, especially since some are known to use gimmicks to fake a 0.000V reading any time the true reading is within a certain number of counts of zero. |
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