The Model ZM1, ZM1P & ZM2N are unique test and measurement instruments that are useful to every sound contractor or installer. The ZM1 measures the impedance of loudspeakers and entire distributed loudspeaker systems as well as individual components (resistors, capacitors, inductors). It will also calculate the wattage that will be produced on an installed loudspeaker system. The ZM1P(shown here) has all the features of the ZM1 but adds an Overload Protection Circuit that prevents the meter from being damaged from amplifier output overloads up to 120VAC and a Tone Generator to improve system testing and performance. These are rugged hand held battery powered instruments with special circuitry to prolong battery life. They come complete with high quality test leads.

The ZM2N (shown with lid removed) takes the advanced features of the ZM1P a step further. Incorporating all the features of the ZM1P, the ZM2N provides a higher level tone output - ideal for use in noisy environments. The ZM2N is battery powered and it can also be powered from any 115VAC or 220VAC* source and comes in a virtually indestructible, crushproof carry case. The lid is removable to allow access into tight spaces. The case employs compound latches, a locking feature and stainless steel hardware is used throughout. High quality test leads are supplied.

Click here to read a review by Glen Ballou on the ZM1.

SPECIFICATIONS

Test Frequencies	100Hz, 330Hz, 1kHz, 10kHz
Voltage Ranges	25Vac - Some USA public schools and institutions
	50Vac - International
	70Vac - USA Industrial Standard
	100Vac - International
Impedance Measurement Ranges	0 - 199.9 ohms
	0 - 1999 ohms
	0 - 19.99k ohms
Wattage Measurement Ranges	0 - 19.99 watts
	0 - 199.9 watts
	0 - 1999 watts
Accuracy (typical)	Impedance ± 3% / Wattage ± 2%
Connectors	All Models: Load / Output - Banana Jacks
	ZM2N Only: Tone / Line Input - ¼" Phone TS 10Kohm
Display	3½ Digit LCD with Battery Low Indicator
Test Tone	ZM1 - Not available
	ZM1P - 400mv (-6dBu)
	ZM2N - 70Vac rms Nominal
Power Requirements	ZM1 / ZM1P - Eight "AA" Alkaline Batteries.
	ZM2N - Sixteen "AA" Alkaline, Nicad or Nickel-Metal Hydride Batteries or 115VAC. Also available in 220VAC* configuration. * Order 220VAC as ZM2N.2
Expected Battery Life	ZM1 / ZM1P - Impedance Mode - 35 hours continuous
	ZM2N - Impedance Mode - 70 hours continuous
	ZM1 / ZM1P - Calculated Watts Mode - 23 hours continuous
	ZM2N - Calculated Watts Mode - 50 hours continuous
Approvals: -	ZM1, ZM1P, ZM2N
	Emissions: - EN 55022 B - FCC Class B
	Immunity: - EN 55024 B
Size	ZM1 / ZM1P - (W x H x D) 3¼ x 8 x 2¼
	ZM2N - (W x H x D) 10¼ x 5 x 9½
Weight	ZM1 / ZM1P - 12 oz.
	ZM2N - 5 lbs.
Case Material	ZM1 / ZM1P - High Impact ABS
	ZM2N - Fiberglass Reinforced ABS

ZM Series Manual 119K unzipped.
ZM1 Article by Glen Ballou. 14.2K unzipped.