In a residence I recently inspected I used a circuit tester designed to verify both GFCI and AFCI circuits. For the circuits that had switched split wired receptacles, when the circuit is energized, the tester indicated wiring was correct and on the AFCI protected circuits, the circuit breaker trips at the panel when the "fault" is initiated by the tester. However, when the switch controlling half of multiple receptacles on the circuit is switched OFF, the tester indicates an open neutral. Using a digital multi-meter, I measured approximately45-50 volts between hot and neutral AND hot and ground. If I plug in another tester in a downstream receptacle, the voltage collapses. Possible causes we've considered are inductive or capacitive coupling between the energized half of the circuit and the "dead" side. Another thought is the switch itself is faulty allow some current leakage. I have verified that the wiring is correct and the neutral is NOT being switched. Any experience with this phenomenon.
18 years ago