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TOA ZM-104A Impedance Meter, Measures Impedance of Speaker Lines Up to 100k Ohms, Zero Adjustment for Accuracy On All Ranges, Easy to Read Meter Calibrates Directly in Ohms
The ZM-104A Impedance Meter can measure the impedance of speaker lines easily in the same manner as a circuit tester measures resistance.
Key Features- Impedance-to-Power Conversion Chart
- Measures Impedance of Speaker Lines Up to 100k Ohms
- Zero Adjustment for Accuracy On All Ranges
- Easy to Read Meter Calibrates Directly in Ohms
- Includes carrying case, test leads and impedance to power reference chart
- Power Source: R6 x 4 (1.5 V DC x 4)
- Current Consumption: 39 mA
- Reading: Direct reading meter, unit: Ω
- Measurement Range: x1 range: 5 Ω - 1 kΩ, x10 range: 50 Ω - 10 kΩ, x100 range: 500 Ω - 100 kΩ
- Accuracy: ±10 %
- Oscillation Frequency: 1 kHz, ±10 %
- Battery Life When Continuously Used: x1 range: 30 h, x10 range and x100 range: 60 h
- Operating Temperature: -5°C to +40°C (23°F to 104°)
- Dimensions: 120 x 220 x 63 mm (4.72" x 8.66" x 2.48") (carrying case)/110 x 180 x 58 mm (4.33" x 7.09" x 2.28") (unit only)
- Finish: ABS resin, black
- Weight; 700 g (1.54 lb) (including carring case, without batteries)
- Accessory: 1 Set Test leads
- Measurement Category: CAT I
Customer
Reviewed in the United States on January 5, 2025
I have used versions of this meter since 1986. I've worn out two over all that time and now it's time for another one. It may not be high-tech but it does a fantastic job. It works especially well reading actual impedance through a Transformer setup. The tone it generates also is helpful in locating hidden speaker devices. At the price it sell for here on Amazon, the one I'm getting is costing the same as the one I last purchased back in 1993 so I consider it a good deal.
Placeholder
Reviewed in the United States on November 20, 2023
I first purchased this earlier last month. But that on arrived dead. I spoke with the manufacturer about it and after our discussion they determined it was a dead piece. They asked me to return it to the seller and request a new one. So I did and it took a month to receive it. Not sure why it was supposed to be an equal exchange. I did not get any emails from them. But it arrived today I will update on if this one works properly.
Kindle Customer
Reviewed in the United States on January 28, 2023
25 years in commercial sound, used the Raymer bridge which was OK but unreliable. THen I got the TOA. Any tech worth his salt should own one of these. Durable, accurate, wide range, simple. I bought a second one as a back up they are so versatile. I think mine were 102s and came with a schematic, a few transistors and resistors damn, you cant beat a good design(r)
Chris D.
Reviewed in the United States on January 8, 2022
Brand new and works great! I love this bridge!
Raymond L. Stribbling
Reviewed in the United States on April 30, 2016
I install commercial sound systems for a living, and this is a tool I can't live without.
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