Hello Folks,
I need to measure the voltage (and current) on a device I am building (Voltage is under 5v and current under 500mA). I don't need a PC Scope and want to keep the price down. Are any of you familiar with/can recommend a PC based multimeter that can do logging? A USB model would be required since my Laptop does not have a parallel port.
Any guidance would be welcomed and appreciated.
Regards,
Karl Tomecek
PC Based Multimeter (USB)
Hi again,
Do you build your own electronic circuits too?
I am asking because i sell a digital to analog converter computer
interface chip. It comes with complete software to measure on
four channels, but i dont make the boards for these things, just
the chip. Current measurement is possible by using a series
resistor and measuring the voltage across it, but to the user all
they have to do is insert a resistor in series with the load and
type the value into the software. The software computes current
from that. The resistor value depends on what kind of circuit
you have connected to it. For example, 1 ohm gives you 1 volt
per amp, but the circuit has to be able to tolerate a drop of
0.5 volts with your setup. If you needed very low voltage drop
that would require an extra op amp to boost the voltage that
the chip reads.
Of course if you dont like to build your own circuits then this wont help,
sorry.
They do make meters commercially that interface wth the computer, but
unfortunately most of them are single channel, that's part of the
motivation for me making my own chip to do 4 channels
Do you build your own electronic circuits too?
I am asking because i sell a digital to analog converter computer
interface chip. It comes with complete software to measure on
four channels, but i dont make the boards for these things, just
the chip. Current measurement is possible by using a series
resistor and measuring the voltage across it, but to the user all
they have to do is insert a resistor in series with the load and
type the value into the software. The software computes current
from that. The resistor value depends on what kind of circuit
you have connected to it. For example, 1 ohm gives you 1 volt
per amp, but the circuit has to be able to tolerate a drop of
0.5 volts with your setup. If you needed very low voltage drop
that would require an extra op amp to boost the voltage that
the chip reads.
Of course if you dont like to build your own circuits then this wont help,
sorry.
They do make meters commercially that interface wth the computer, but
unfortunately most of them are single channel, that's part of the
motivation for me making my own chip to do 4 channels
LEDs vs Bulbs, LEDs are winning.
Hey Al,
Thanks for the offer, but I am really looking for something built already. I don't want to buy a meter with a computer interface. But rather, there are PC scopes out there that are simply an interface to the PC. I could use that, but I wanted to reduce the cost, since right now I am don't need a scope. Anyhow, thanks for getting back to me...You are always a gentleman on the N&V Board!
Regards,
Karl
Thanks for the offer, but I am really looking for something built already. I don't want to buy a meter with a computer interface. But rather, there are PC scopes out there that are simply an interface to the PC. I could use that, but I wanted to reduce the cost, since right now I am don't need a scope. Anyhow, thanks for getting back to me...You are always a gentleman on the N&V Board!
Regards,
Karl
There are a number of "scopes" in this range. Usually you sacrifice frequency response at the lower price ranges. Take a look at this scope, on the high end of your range.This one is on the lower end.ktomecek wrote:Well, Pico Scopes start at $400. The data loggers they make (which is apparently my goal, in their terms) Start at $190. I would say $100 -$150. If I can't find something is this range, I will just forgo and use the old fashioned way...Measure and write it down periodically (LOL)!
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