Do I already have the latest firmware for the H4?
Also, how can I tell if my USB cable is data-capable?
Also a question on calibration. A calibration guide I read says to add any pigtail cables you are going to use when doing the calibration. My measurement setup will need a SMA female to SO-239 female cable. But of course then the SO-239 will not fit the SMA calibration references. Is that not a big deal, so I can leave the SMA to SO-239 cable off when calibration and still get good results? Or is there another solution?
