ZM-104A | IMPEDANCE METER MEASURES IMPEDANCE OF SPEAKER LINES UP TO 100K OHMS / BATTERIES REQUIRED: 4X AA

ZM-104A
IMPEDANCE METER MEASURES IMPEDANCE OF SPEAKER LINES UP TO 100K OHMS / BATTERIES REQUIRED: 4X AA

The TOA ZM-104A is a portable, easy-to-use impedance meter designed for measuring the impedance of speaker lines and distributed audio systems, including 25V, 70V, and 100V installations. Built for contractors and integrators who need fast, accurate system verification, the ZM-104A offers a wide measuring range (up to 100 kO), simple rotary selector operation, and a large, easy-to-read display. It’s ideal for confirming load impedance before powering amplifiers, troubleshooting faulty speaker runs, verifying transformer-tapped loudspeakers, and ensuring proper system loading for commercial audio installations. Compact and battery-powered, the ZM-104A delivers dependable field performance for installers working in schools, houses of worship, retail spaces, corporate facilities, and distributed audio environments.

• For easy and exact measurement of speaker impedances including long cable length
• Battery driven for mobile use (4 Mignon (AA) batteries)
• One set of batteries for 30 - 60 hours operation time (depending on the measurement range)
• Graphic conversion table impedance-power
• Oscillator generates 1 kHz frequency
• Measurement range of 5 to 100 kO
• Comes with a case and one set of test leads

Use:

Perfect for AV integrators, contractors, and technicians who regularly test distributed speaker systems. Best used for:

• Verifying 70V/100V loudspeaker line impedance before energizing amplifiers

• Troubleshooting speaker wiring, shorts, or mismatched taps

• Commissioning new installations to confirm correct load values

• Maintenance checks in commercial and industrial facilities

Integrates seamlessly into any technician’s toolkit for routine system verification on TOA, AtlasIED, JBL, Bogen, Lowell, or any commercial audio loudspeaker and amplifier systems.