On Wed, Aug 23, 2023 at 01:52 PM, Geoff Peters - AB6BT wrote:
In this case, what I'm trying to determine is the minimum distance I can
measure to a fault.. I used 4.8mm to simplify this discussion, I'm not sure
what you mean by "only in steps of 1 so this is the limiting factor." . I
understand that the actual distance/step is VF dependent.
The resolution is 4.8 mm but the accuracy will be worse because you cannot enter the VF to more than two digits. So if the VF is 69.5 % and you have to enter 69 or 70% that will affect the calculation because the VF used in the NanoVNA is off by 0.5 %. But for practical purposes it will be close enough.
BTW - if you select the Format as "Real" in the menu the line will move to the center of the display and shorts and open can be determined by seeing if the pulse is above or below the line just like with a TDR test box.
Roger
Roger Need
