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| Dual channel multimeter or another option? |
| (1/8) > >> |
| thared33:
I'm a musician and I've been aligning and calibrating some old tape machines with great success. Currently I just use a desktop Mac for checking levels. I run the cables into an audio interface, look at the dbfs meters in software and tweak the pots on the machine until I get the L&R channels evenly matched within 0.1db. But now I'm getting tired of lugging around machines over to my computer. I have a couple multimeters but they're only single channel. Would a dual channel multimeter be a good fit for my purposes, and if so are there any out there that won't break the bank? |
| coromonadalix:
ou have precise vu meters who could do the job instead ? A dual display meter like the prova-903, pls note the dual inputs are common ground, they are not floating / isolated 0.1 db appart means some resolution, not sure an meter will be good for dedicated audio ? or use an portable dual channels scope ? You calibarte them at 0db with 1khz signal ? Or a gadjet like this https://www.ebay.com/itm/184796771209? |
| nctnico:
--- Quote from: coromonadalix on December 07, 2022, 11:11:22 am ---ou have precise vu meters who could do the job instead ? A dual display meter like the prova-903, pls note the dual inputs are common ground, they are not floating / isolated 0.1 db appart means some resolution, not sure an meter will be good for dedicated audio ? or use an portable dual channels scope ? --- End quote --- 0.1dB is 1% so it does not require a super accurate DMM to measure the level. 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%. |
| tszaboo:
Keithley makes desktop DMMs that can be used for THD and other audio features. 2015 and 2016 if I recall. They show up on ebay at reasonable prices sometimes, like 300 USD. I don't think it comes with two channels, but you can select between the front and the rear terminals with a clunking pushbutton. So you make a cable and then you can switch between them, and get the things to the required reference level. |
| HKJ:
Buy a small function generator to supply the signal, them use the same DMM for both channels. With a stable input signal the calibration will be easier. |
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