12
Measuring AC Freq and Imp (cont.)
How to measure AC Impedance
1. Power on the AMM-1 by pressing the ON button
2. Unit will power up, display internal battery condition,
and then land on the DC Voltage Screen.
3. Press the MODE button four times (or hold down) to
get to the Frequency & Impedance screen.
4. Shut off AC source (amplifier)
5. Disconnect one of the wires from the load of interest
(subwoofer)
6. Run the either the negative or positive speaker wire
through the hole on the center of the AMM-1, and
reconnect the wire to the load. (Doesn't matter
which one, but only use ONE of them)
7. Connect the voltage harness to the banana jacks
and then to the amplifier speaker outputs (+) and (-)
8. Power up AC current source (amplifier) and apply a
signal with a tone generator or tone CD.
9. The AMM-1 will display the Frequency and
Impedance
