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RE: Data Acquisition
Original poster: Jan Wagner <jwagner-at-cc.hut.fi>
On Mon, 19 Jan 2004, Tesla list wrote:
> Original poster: "David Thomson" <dave-at-volantis-dot-org>
> I'm trying to do true data capture over minutes and hours (maybe days for
> some experiments). The parameters I'm looking for are potential, current,
> resistance, magnetic field, capacitance, inductance and electrostatic
> potential. None of my experiments in the near term will be while the coil
> is operating. I'm measuring components over time in order to better
> understand how they react to ambient conditions.
> I plan to purchase the electrostatic potential meter at
$370USD? Ouch! Ebay has a similar but non-digital "electrostatic
voltmeter" (item 2589642299) for a $60 Buy It Now.
If you don't mind tinkering and adding a microcontroller + ADC (and
precision and calibration isn't too important ;) you could
also try a DIY electrometer like
> I'm thinking about purchasing the digital multimeter at:
Did you already see the specs at
Max resolution: 10nF, 10mH.
Is this sufficient for your purposes?
> But the problem with this unit is that it works on the serial port.
For its price, measurement data exchange over serial port is just nice,
for hobby and semi-serious stuff.
You could spend a lot of bucks on GPIB or HPIB enabled equipment and also
get a GPIB card from National Instruments, brilliant connectivity and
easy to program the bus (like, write your own progs). But it's expensive
like h*ll, even on eBay... :-|
> I'm not sure if I can run more than one instance of the software at a time
> if I operated 4 units simultaneously.
You can download the software from HungChang and give it a try.
According to google the software appears to be
I'd think it is possible to select the serial port in the software. If you
run out of COM-ports on the PC you can get add-on PCI cards.
Helsinki University of Technology
Dept. of Electrical and Communications Engineering
http://www.hut.fi/~jwagner/ - jwagner-at-cc.hut.fi