When using the Coil Tester to test whether Big Magic is functioning properly, is it normal for the Coil Tester not to stay lit up constantly?

When using the Coil Tester to test whether Big Magic is functioning properly, is it normal for the Coil Tester not to stay lit up constantly?

This is normal. Inside Big Magic, there are individual coils arranged in a sequence, so occasionally the Coil Tester may not light up when it is far away from the coils.