Pulse train on 6024E, Labview (PC)

[Walter Petermann]

Hi,
I was wondering if it's possible to change
the output frequency (GPCTR0) without the
output going low for a few milliseconds.

I am using the 'pulse config' and 'counter start'
vi when I need to change the frequency. I plan
to use this setup to calibrate speedometers and
tachs. It would be nice if I could stop the needle
from trying to jump to zero every time I have to
change the drive frequency.

Somewhere in the manuals is mentioned that the
parameters of the DAQ-STC can be changed 'seamlessly'.
I tried (in vain) finding this section again.

Any advice would be welcome.

thanks,

Walter

[Johnner]

Walter,

I'm not 100% sure if this example will eliminate the dead spot during
counter reconfiguration or not, but I think it might:

http://digital.ni.com/explprog.nsf/websearch/b679344977a79f708625675100466034

("Pulse Width Modulator for LabVIEW" on the NI example programs site)

It should work with your E Series card.

Regards,
John Lum
National Instruments

> I was wondering if it's possible to change
> the output frequency (GPCTR0) without the
> output going low for a few milliseconds.
>
> I am using the 'pulse config' and 'counter start'
> vi when I need to change the frequency. I plan
> to use this setup to calibrate speedometers and
> tachs. It would be nice if I could stop the needle
> from trying to jump to zero every time I have to
> change the drive frequency
.

[Walter Petermann]

Thanks John,
I hope to try it today. Will let you know how it
goes.

Walter

John Lum wrote:
>
> Walter,
>
> I'm not 100% sure if this example will eliminate the dead spot during
> counter reconfiguration or not, but I think it might:
>
> http://digital.ni.com/explprog.nsf/websearch/b679344977a79f708625675100466034
>
> ("Pulse Width Modulator for LabVIEW" on the NI example programs site)
>
> It should work with your E Series card.
>
> Regards,
> John Lum
> National Instruments
>
> > I was wondering if it's possible to change
> > the output frequency (GPCTR0) without the
> > output going low for a few milliseconds.
> >
> > I am using the 'pulse config' and 'counter start'
> > vi when I need to change the frequency. I plan
> > to use this setup t
o calibrate speedometers and
> > tachs. It would be nice if I could stop the needle
> > from trying to jump to zero every time I have to
> > change the drive frequency.