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| Brand new Bm869s calibration |
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| mrdave45:
Thanks again, I've ordered one along with a de 5000. Just need a logic analyser now. I suspect it'll be a cheapo la2016, but will have a look at a msos but I think the one I'll really want will be far too much. |
| bdunham7:
--- Quote from: mrdave45 on February 19, 2021, 07:36:45 pm ---How else would you control something like that? You can only use a resistor ladder off a keyboard for mono synths, and maybe a duophonic synth if youre really clever. I never really looked into that. Midi is also digital, so thatll need converting. --- End quote --- For an analog hybrid like you're doing, I guess I can't really think of anything. But you'll have to tune each note like a piano, right? Or is is worse, where you have to tune the equivalent of 8 pianos? I'm still trying to make a mental image of how that all maps out... |
| mrdave45:
The hybrid nature of the instrument doesn't affect how its tubed. Pretty much all analogue vco polysynths use dacs. Youll need to setup each oscilator for correct scaling and initial pitch at a given voltage. That will mean the dacs will be pretty close. For a monosynth, that would be enough. However, with multiple osc, you will need some calibration routines. But tuning every note and making note off offset would be an automated once in a blue moon procedure. Generally, check a few specific pitches on each vco would be enough. If you look at the service manuals, all those patchable synths essentially use one dac which is multiplexed and sampled and held where it scans round 20 to 40 parameters or so. |
| mrdave45:
I dont suppose if any one knows whether you can log frequency against voltage with the data logger? It looks like the meter will read freq and output with VFD function but was wondering if i could graph output voltage (ac rms, preferably on a db scale, but i can always export to excel and process that) in freq domain rather than time domain to create a freq response bode plot. Just wondering whether i should have ordered the data logger after all. Thanks |
| IanB:
The meter (like almost all logging DMMs) can sample what is shown on the display at regular time intervals and record these measurements to a log (in the case of the BM869s this log is stored on a computer connected over the interface cable). Since the 869s has a dual display it can log two displayed values in each record. This would allow you to import the data log into Excel or something and then plot voltage against frequency. |
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