"i have a systronics make 60 Dual. should i stick to it"

Yes. Unless it shows a sinus as a square !

Abhishek, I think there has to be a specific reason as to why you want to do what you want to do right now ...

1. Lugging the oscilloscope to the field is a problem : In which case a desktop PC is worse. Here one would go with a notebook PC + Convertor card with USB port. This apart from being handly CAN burn a big hole in that pocket of yours.

2. I want to store waveforms for future analysis : Yes this could be one benefit of the PC cards.

3. Calibration and precision : I am skeptical in this aspect. I think a standalone Oscilloscope is much easily calibrated than a PC card which anyway has to operate in the middle of digital madness sharing the same PCI bus with other peripherals.

4. And last - an oscilloscope will not hang on you while capturing the most interesting part of the curve that your signal generator is pumping out....

Raghu