Hi Vincent,
> I have labview 7.0 and I have to use a HP 34970a with serial port.
> Can anyone say to me any advice to do it?
> Where can I find some material?
Your first step should be visiting http://ni.com/idnet and search for an
instrument driver for your device (in this case I can promise you will
find one).
The "Learn" link on the same page tells you more about instrument
drivers in general which could be helpfull if this is the first time you
are working with instrument drivers.
Rico