Assuming your problem is a hardware fault with the NaTKiT board or the associated amplifier and measurement chain (perhaps flatlining):

Is NaTKiT Reporting "NaTKiT hardware not found …"?

Yes - if the NaTKiT has been found previously try moving the NaTKiT board to another slot, or re-seating in the same slot, otherwise work through the section Installing The Hardware in the user guide.  If moving the board doesn’t solve the problem contact NaTCH.

No – try the next section.

Is There Sound From The Loudspeaker During Tests?

Yes – try the next section.

No – something is faulty in the output chain, ie the NaTKiT, power amp or leads.  (Maybe you even have a dead loudspeaker.)  The easiest way to identify the fault is by substitution.  Rules 1 and 2 apply, and anyway the easiest thing to substitute is the leads, so start there.

If you are testing crossovers you could substitute a loudspeaker for the test unit to do this test.

If You Clap Near The Mike During A Test Do You Get Something Like This?

Yes – contact NaTCH.  However, at the moment we are just as baffled as you are.

No – something is faulty in the input chain, ie the microphone, microphone pre-amp, NaTKiT, or leads.  The easiest way to identify the fault is by substitution.  Rules 1 and 2 apply, and anyway the easiest thing to substitute is the leads, so start there.