On Thu, 14 Jan 2021, Ralph Stirling wrote:
Date: Thu, 14 Jan 2021 17:40:51 +0000
From: Ralph Stirling <ralph.stirl...@wallawalla.edu>
Reply-To: "Enhanced Machine Controller (EMC)"
<emc-users@lists.sourceforge.net>
To: "emc-users@lists.sourceforge.net" <emc-users@lists.sourceforge.net>
Subject: [Emc-users] measuring frequency with 7i90
I am using an AD7740 voltage-to-frequency converter
and Mesa 7i90 encoder input to measure an analog
voltage. The AD7740 circuit is working ok, with a 0-100kHz
pulse train output. I have the encoder function set to
counter-mode 1, and have the pulse train connected
to the encoder A input. I am not getting any velocity
or counts though. Is there some additional step needed
to enable frequency measurement? The encoder B input
is not connected. I have tried it with and without hires-timestamp.
Thanks,
-- Ralph
That should work, in fact, thats how our THCAD for plasma works.
what is the pulse length? if the encoder filter is enabled
it will ignore the pulses if they are shorter than 15 encoder
sample periods (nominally 600 ns at the default 25 MHz
encoder sample rate)
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Peter Wallace
Mesa Electronics
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