PlasmaC Fiber laser 1Kw head height control + auto focuas

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11 Apr 2020 01:13 #163552 by taloot

Taloot, Do you have a way I can get in contact with you. I would like to find out more information about your lasers.

my s k y p e
taloot abdullah

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11 Apr 2020 01:15 #163553 by taloot
i have problem ,, the signal come from THCAD... isnt stable,, its changing with in limit fluctuation ... do i have to use lowpass filter?

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11 Apr 2020 03:23 - 11 Apr 2020 03:26 #163565 by PCW
The THCAD output should be about 10 bit resolution if read every 1 ms servo thread period
you can improve the resolution (at the expense of bandwidth) by low pass filtering

You can verify noise level by using a 9V battery

If you dont need HV protection and high isolation, a 7I87 is probably a better choice
as you can get 12 bit resolution independent of servo thread rate
Last edit: 11 Apr 2020 03:26 by PCW.

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11 Apr 2020 03:39 #163567 by taloot

The THCAD output should be about 10 bit resolution if read every 1 ms servo thread period
you can improve the resolution (at the expense of bandwidth) by low pass filtering

You can verify noise level by using a 9V battery

If you dont need HV protection and high isolation, a 7I87 is probably a better choice
as you can get 12 bit resolution independent of servo thread rate

how can i stabilize the reading from thcad
i have no luck to link the lowpass filter as most examples in the forum is, for spindle

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11 Apr 2020 03:44 #163568 by phillc54

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11 Apr 2020 06:17 #163578 by taloot

If you are using the PlasmaC component it has a built in low pass.

github.com/LinuxCNC/linuxcnc/blob/master...smac_connections.hal

im experimenting outside plasmac.
i have about 1% fluctuation... is that normal?

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11 Apr 2020 09:55 #163593 by phillc54
Have you tried with a battery as the input source.

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11 Apr 2020 13:07 - 11 Apr 2020 13:08 #163605 by taloot
i have 0-10v signal generator
same as this.,
www.google.com/search?q=0-10v+generator&...imgrc=AkuSyKsLNCEOqM

after applying lowpass filter is 0.01% fluctuation
Last edit: 11 Apr 2020 13:08 by taloot.

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11 Apr 2020 13:11 #163606 by taloot

The THCAD output should be about 10 bit resolution if read every 1 ms servo thread period
you can improve the resolution (at the expense of bandwidth) by low pass filtering

You can verify noise level by using a 9V battery

If you dont need HV protection and high isolation, a 7I87 is probably a better choice
as you can get 12 bit resolution independent of servo thread rate


there is no much noise from the system,, 10 bit is good for me
but how can the low pass filtering effect the resolution

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