Re: external clock for AI trad & mx

2004-05-11 Thread Gabriela Tillmann
To verify that last sentence of rising/falling edge ignorance I made an experiment. I use a programmable function generator. On channel 1 a ramp (100kHz) on 2 a pulse with a width so that the rising and falling edges are at distinctly different point of the ramp. When I switch between sample point

Re: external clock for AI trad & mx

2004-05-10 Thread Stuart G
Gabriela One thing you might check is your convert rates. I know there was a change between Trad DAQ and DAQmx on the convert rates. Since you are using an external clock I am not sure if it will matter or not, but make sure these are the same in your applications. Stuart Gillen National Instru

Re: external clock for AI trad & mx

2004-05-10 Thread Gabriela Tillmann
I do not expect to see a square wave. The external clock is synchronous to the data pulses so I should always see the maximum (flat top) of the negativ and positiv half-wave. That results in a triangle in the VI display, that's understood. I thought, that using external sample pulses is a purely ha

Re: external clock for AI trad & mx

2004-05-10 Thread peterguy
Hi Gabi, if you are not having the newest NI-DAQ driver(7.2) you should first update it. You can download the driver for free on our homepage. Perhaps the delay is only a small bug which is fixed in a newer driver-version. If this doesn't help, can you post your VIs? I would like to look at your c

external clock for AI trad & mx

2004-05-06 Thread Gabriela Tillmann
We are using a 6110 to read a train of bi-polar analog pulses. The pulses consist of a negative and positive half-puls with 250 ns spacing. These are sampled with an external clock on PFI0 of the same high speed. Up to now we were using traditional NIDAQ 7.0 currently with LV 7.0 on a Win2K PC.