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The Digital Audio Impedance Meter (Q 2004) connects to a 100 volt line and automatically displays speaker loading (wattage) and ac (audio) circuit impedance.

To measure circuit impedance, the meter puts an audio tone on the 100 volt line. The Q 2004 automatically calculates the speaker loading, based on the measured impedance. Both results are displayed on an OLED display.

The meter also has a System Check mode. In this mode it puts out a 1 kHz tone, allowing the user to walk around the installation and check that all connected speakers are working. The test duration is programmable.

It is usually impracticable to check a 100 volt line with a DC multi-meter. With the speaker transformers connected via series capacitors, a DC meter will simply measure the "end-of-line" terminating resistance. It is quicker and easier to diagnose potential faults with an AC impedance meter like the Q 2004.

The Q 2004 features auto power off, a built-in charger for charging its internal battery from a USB source, and a rugged hand-held case.

Features

• Automatic ac (audio) impedance test
• Automatically calculates speaker loading for a 100 Vrms line circuit
• OLED display shows load impedance and wattage
• Also suitable for measuring low impedance speaker loads of 4 - 16 Ω
• Auto-ranging, 1 Ω to 20 KΩ, suitable for up to 5,000 watt total load
• System Check mode for walk-around speaker system test(20, 60 or unlimited minutes)
• Push-button operation
• Low battery indication
• Inbuilt battery charging circuit
• USB charging lead supplied
• Auto power off
• 5 V rechargeable lithium polymer internal battery
• Supplied complete with silicon test leads
• Complete with soft carry case
• Buzzer and haptic feedback option via menu access
• Rugged yet easy to hold compact hand-held case: 117 H x 77 W x 33 D (mm)
• Accuracy ± 10%
• Compatible with fault supervision systems on typical fire alarm 100 volt line systems
• Also calculates speaker loading for 50 Vrms and 70 Vrms line circuits.