[time-nuts] Multiple Voltage monitoring

John Miles jmiles at pop.net
Fri Jul 31 04:57:10 UTC 2009


Ah.  Well, I guess that's the catch, then. :(

Unless they actively encrypt the data, I'd guess that a few minutes with a
variable power supply and a copy of Wireshark would open the proverbial
kimono.

Failing that, how about a bank of V-to-F converter chips with paralleled
outputs, driving a line-in jack which is then FFT'ed to recover the
'channel' amplitudes?  Cost would be a buck or two per input at most, plus a
few hours' soldering and hacking time.

(Or an Atmel chip with an RS-232 hookup, as F. Larsen's post suggested just
before I hit 'send' on this one.  That'd be the easy way out, I think.)

-- john, KE5FX


> I've actually got some of their ethernet devices.  The problem is that
> the drivers are all closed.  They give no info on how to talk to them
> without LabView.
>
> Matt
>
>
> On Thu, Jul 30, 2009 at 9:34 PM, John Miles<jmiles at pop.net> wrote:
> > National Instruments has been getting aggressive with their
> pricing lately:
> > e.g., http://zone.ni.com/devzone/cda/tut/p/id/8675 .  I was
> actually toying
> > with the idea of getting into the DAQ business a few months ago, but I
> > changed my mind in a hurry when I saw their ads.
> >
> > -- john, KE5FX
> >
> >> -----Original Message-----
> >> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com]On
> >> Behalf Of Matt Ettus
> >> Sent: Thursday, July 30, 2009 9:19 PM
> >> To: Discussion of precise time and frequency measurement
> >> Subject: Re: [time-nuts] Multiple Voltage monitoring
> >>
> >>
> >> DC, 0 to 6V, 10mV or better resolution.
> >>
> >> Thanks,
> >> Matt
> >>
> >> On Thu, Jul 30, 2009 at 9:08 PM, WB6BNQ<wb6bnq at cox.net> wrote:
> >> > Hi Matt,
> >> >
> >> > 1.    Is the voltage AC or DC ?
> >> > 2.    What is the voltage range ?
> >> > 3.    What kind of resolution ?
> >> >
> >> > Bill....WB6BNQ
> >> >
> >> > Matt Ettus wrote:
> >> >
> >> >> Does anyone have a good solution for monitoring 4-8
> different voltages
> >> >> at the same time?  I only need a sample rate around 1-2 Hz,
> but would
> >> >> need GPIB, serial, or ethernet support with protocol documentation.
> >> >>
> >> >> Any help identifying a solution other than 8 voltmeters
> would be much
> >> >> appreciated.
> >> >>
> >> >> Thanks,
> >> >> Matt
> >> >
> >> >
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