ZM1P Impedance Meter
- rugged, battery-powered hand-held unit
- measures impedance at selected frequencies – 100Hz, 330Hz, 1kHz, 10kHz
- displays impedance in three ranges – 200, 2k and 20k Ohms
- calculates overall system wattage in three ranges – 20W, 200W and 2kW
- includes overload protection
Particularly suited to testing 70V- or 100V-line loudspeakers, the multi-range ZM1P should be considered an essential part of
any sound contractor’s toolkit.
It can measure the impedance of distributed loudspeaker systems and components, including resistors, capacitors and inductors, at four selectable frequencies. It can also calculate the wattage produced by a system – an invaluable facility for testing that amplifier ratings are sufficient to drive the number of loudspeakers installed. This can represent a problem area for more than a few installations, where different contractors may have been asked to add extra loudspeakers from time to time, without the client necessarily realising that the amplifier also needed upgrading to keep pace.
To make system testing easier, the unit includes a built-in high-level tone generator, allowing an engineer to listen to the loudspeakers under test, and an overload protection circuit safeguards the ZM1P from potential damage by amplifier output overloads up to 120Vac.
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