Hi we need to check 100V PA sistem, have we to disconect the cables from the amplifier or only turn off th amplifier to do the measurement?

Yes. The output impedance of the amp will throw off your measurements. You should never try to measure line impedance with an amplifier connected, and if the amp is powered up still you will fry the meter.

Will this test a 70 volt paging horn?

Hi, This meter is to test audio impedance, not to test voltage, and the teste range is 20Ω/200Ω/2000Ω, I don't know the resistance of your 70 volt paging horn, please find it out. Anyway, I have upload the manual to listing page, you can check the manual for detail. Thank you!

Does it display reactance (capacitive and/or inductive)?

Inductive. However, it's cheaply made and the one I purchased had to go back. It only worked of you didn't tighten the screws on the battery cover.

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ALLOSUN - EM480B Audio Impedance Tester Digital LCD Insulation Resistance Megohmmeter Meter Tester with Bag

Product ID: 25408151

Details

Brand
allsun
Color
Black yellow
Item Weight
0.5 Kilograms
Power Source
Battery
Style
Modern Digital

⚡Selectable test voltage: 250V/500V/1000V

📊Digital LCD with data hold & auto power off

🔋6x AA battery powered

117583CFA

Duties & taxes included

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Sold byAmazon SenegalDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

⚡ Empower your diagnostics with precision and portability!

POWER ON THE GO 🔋 - Runs on 6 AA batteries for ultimate portability—no cords, no limits.
CARRY WITH CONFIDENCE 🎒 - Includes a sleek carrying case and belt for effortless transport and on-site readiness.
PRECISION AT YOUR FINGERTIPS ⚡ - Easily switch between 250V, 500V, and 1000V test voltages with a rotary dial for versatile testing.
STAY INFORMED STAY EFFICIENT 📊 - Digital LCD display with data hold function ensures you never miss critical readings.
BUILT TOUGH FOR HIGH LOAD RESILIENCE 🛡️ - Advanced protection circuit guards against damage from discharge voltage, extending device lifespan.

The ALLOSUN EM480B is a battery-powered digital insulation resistance megohmmeter featuring selectable test voltages (250V, 500V, 1000V), a clear LCD with data hold and auto power off, and a robust protection circuit. Designed for professionals on the move, it comes with a carrying case and belt for easy transport, making it an essential tool for accurate electrical testing in any environment.

Specifications

ASIN	B013QKIGU6
Best Sellers Rank	#268,577 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #45 in Insulation Resistance Meters
Brand Name	allsun
Color	Black, yellow
Customer Reviews	4.3 4.3 out of 5 stars (43)
Global Trade Identification Number	00788537553533
Included Components	Test Lead1 pair; English Manual; Belt1;Storage Bag*1;
Item Dimensions	6.69 x 2.56 x 4.33 inches
Item Weight	0.5 Kilograms
Manufacturer	Zhangzhou Eastern Intelligent Meter Co., Ltd
Measurement Type	Ohmmeter
Minimum Operating Voltage	250 Volts
Model	EM480B
Part Number	EM480B
Power Source	Battery Powered
Style Name	Modern Digital
UPC	788537553533
Unit Count	1.0 Count

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