Nice setup, it can be useful to diagnose a funky switch, or measure the current on a non active LNB, (not pointing to a satellite and tuned to a transponder) but it can't measure the DC current on an active setup if that amp meter is in-line between the LNB and the receiver, it will cause a total loss of signal to the receiver.

You need a very special circuit between the LNB and the power supply to do that without significant signal loss.