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| Dual channel multimeter or another option? |
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| nctnico:
--- Quote from: bdunham7 on December 07, 2022, 05:23:52 pm --- --- Quote from: nctnico on December 07, 2022, 11:51:16 am ---The prova-903 looks like a tool that can do the job. It has a wide frequency range for AC measurements. Many multimeters only work well for 50Hz/60Hz. An oscilloscope is not suitable as the DC accuracy is ballpark 1% to 3%. --- End quote --- I'm going to have to respectfully disagree on two points. First, IMO the Prova 903 would likely be a worse setup than simply using two decent multimeters. The only reason to use it would be if you really, really wanted a one-box solution. --- End quote --- OK. Didn't know it didn't meet the specs. It is quite expensive so I expected it would perform better. --- Quote ---Second, a proper DSO is a much, much better tool for this IMO, aside from the bulk and line cord. You don't need absolute accuracy for the OPs use, just relative accuracy. That's easy enough to test by simply giving your two channels the same signal. Many decent modern DSOs will be much more accurate than 1%, both relatively and absolutely. Here's a 1.00000Vrms 1kHz signal from a calibrator put into CH1 and CH1 of a Siglent 2354X+ that was just turned on with no warmup and no self-cal. --- End quote --- No. Just the probe adjustment alone can have a larger than 1% error. Really, for measuring signal levels an oscilloscope simply is the wrong tool -period-. Argueing you can is like saying you can use a hammer to drive screws into wood >:D |
| tautech:
--- Quote from: nctnico on December 07, 2022, 07:27:33 pm ---No. Just the probe adjustment alone can have a larger than 1% error. Really, for measuring signal levels an oscilloscope simply is the wrong tool -period-. Argueing you can is like saying you can use a hammer to drive screws into wood >:D --- End quote --- A feature you don't know of in these is the new Probe Check when a probes through input is compared against the probe compensation output and a custom attenuation applied to increase accuracy. bdunham7, can you be educator on this subject seeing you have your scope turned ON ? |
| bdunham7:
--- Quote from: nctnico on December 07, 2022, 07:27:33 pm ---No. Just the probe adjustment alone can have a larger than 1% error. Really, for measuring signal levels an oscilloscope simply is the wrong tool -period-. Argueing you can is like saying you can use a hammer to drive screws into wood >:D --- End quote --- What probe? This is a perfect case for using 1X. And this isn't measuring signal levels, it is comparing them. You can test and characterize any imbalance between channels or probes if you want. But as for hammering screws, did you look at the screenshot? It is obvious that the scope depicted is quite adequate for measuring signal levels. Perhaps like a Pozi-Drive hammer? Scopes do have their calibration issues, especially offsets with small signals. But in many cases IMO they are the very best available (at reasonable cost) tool for measuring signal levels. Think high-complexity or high bandwidth RMS measurements. |
| nctnico:
Well, a true-RMS DMM rated for the frequency range to be measured, doesn't need pre-calibration of anything. It works out of the box to give you repeatable AND accurate results. For high frequencies you use a power meter. @Tautech: no, an oscilloscope is the wrong tool for the job. For starters: what is the long term drift for the calibrator output? It's not specified in the datasheet of the SDS2000X+. Also the amplitude flatness at low frequencies is +/-1 dB which is over +/-10% error (which is 10 times worse than what the OP requires). Need I continue to educate you further or do you get the point? |
| coromonadalix:
Normally in audio stuff you calibrate stuff at 0db at 1khz, done tons of real tapes / cassette tapes cd players, dat tapes and other types Unless it is specified at other frequencies, you have pink noise and white noise generators too A scope will be very good at 1x, you don't play with dangerous levels, at 10x or 100x is good to get higher impedances on the probe if 1x create some signal load .... on too sensitive circuits like head amplifiers The best would be a scope with an integrated signal generator, 2 in 1 instrument, It would be the best for trouble shooting For me "an old era tech" i would use an scope before a meter, or dual input meter .... But portability wise a good meter would do fine, i really don't know the Prova brand, maybe they are good at 60k counts on each display / channel Every one here can argue over this and that, it really depend on the OP need(s) and portability wise |
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