what card would i need to see a clear, square 1 microsecond pulese?

[weizbox]

Im going to be working with some pulses that may be as little as 1 microsecond, I need a card that I can see this pulse as a square. I will be measuering the amplitude of the pulse is this makes a difference. Currently I have an E-Series DAQ card that isnt going to be cutting it for me, even at 10 microseconds it isnt that clear, but still not nearly as bad as it is with 1, which seems to turn out more like a sharp point that a square. Ive heard somthing about possibly useing a counter/trimer card for somthing like that, but honostly I really dont know too much about them. If anyone has any ideas of what I would need it would be greatly appreciated, as well what sampling rate would I need?

Thanks

-Mark

[alipio]

Hello

Basically,to deal with 1 microsecond pulse, you need a speed of 10 Msamples or more.So take a look at NI High-Speed Digitizer Devices.
Hope it helps

Alipio

[Dennis_Knutson]

A counter timer would do the job if all you are interested in is a pulse width measurement. Nyquist says you need a sample rate at least twice the signal frequency. You won't see anything close to a square wave at 2X but it might be sufficient depending on what kind of tolerances you're dealing with and how much overshoot/undershoot is liable to be present. A 10 Msample daq board gives you a sample every 100 nsec. If the amplitude that you're interested in is at the center of the pulse, I'd think this sample rate would be ok.