No frequency when "S" is set above 240
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Unit is a Duet 2 wifi firmware 3.4.2.
M452 C"exp.heater4" R250 F2000
I'm in experimental stage. With a Fluke 76 meter set to HZ I will read Frequency if my command line is G1 X50 S200 F100. If the "S" is set above 240 or below 15 I will read a voltage but no frequency. I have voltage readings all the time. Voltage varies "S". I have also test this on Bigtreetech BTT E3 RRF. The min and max numbers are little different but not by much. The output voltage can't see max if it's lower. I have not hooked up to laser yet and/or tried to create a file. Is this acceptable or is there a way to get full range frequency? Can laser application put limits on "S" range? -
@Cubex249 do your readings change If you modify the F parameter in M452? The laser setup docs use 200Hz, the M452 docs use 100Hz, and the default PWM (F parameter omitted) is 500Hz ... maybe 2000Hz is too high?
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@oliof Tested at 100,200,500. I see no significant difference. I removed the inverted ! in the M452 just for testing. At S245 HZ is stable. at S246 the HZ starts out momentarily at requested frequency but then varies between 60hz and requested. At S248 there is no HZ. With the ! inverter the Number is around 20 for the "S" The voltage does change with "S" changing. Full range. Does the Laser need the HZ? Has anyone else tested for HZ?
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@Cubex249 maybe the 8bit value is downsampled? Would need some Source Code spelunking.
I know a couple people happily using lasers with RRF, so maybe it's not a practical issue.
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@Cubex249 it appears that your meter is not designed to measure frequency when the mark:space ratio is so far away from 1:1.
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I'll see if I can borrow a scope. Thanks all
