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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⚡ Empower Your Diagnostics with Precision & Portability!

PORTABLE POWERHOUSE - Battery-operated with 6 AA cells and included carrying case & belt for seamless on-the-go use—never miss a critical test.
SMART USER EXPERIENCE - Features data hold, auto power off after 15 minutes, and low battery indication to maximize efficiency and device longevity.
VERSATILE VOLTAGE CONTROL - Easily switch between 250V, 500V, and 1000V test voltages via rotary switch to match any professional testing scenario.
BUILT FOR HIGH LOAD SAFETY - Robust protection circuit and LED high voltage indicator keep you safe while testing transformers, motors, cables, and more.
PRECISION AT YOUR FINGERTIPS - Accurate impedance and insulation resistance testing with ±(2%+2) accuracy ensures reliable diagnostics every time.

The ALLOSUN EM480B is a professional-grade digital audio impedance and insulation resistance tester featuring a clear LCD display, selectable test voltages (250V, 500V, 1000V), and a robust battery-powered design. It includes essential functions like data hold, auto power off, and a protective circuit to ensure safe, accurate testing of electrical components such as transformers, motors, and cables. Compact and portable with a carrying case and belt, it’s engineered for the demanding needs of field technicians and audio professionals alike.

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€ 341.40

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Brand	allsun
Power Source	Battery Powered
Style	Digital,Portable
Item Weight	0.5 Kilograms
Item dimensions L x W x H	17 x 6.5 x 11 Centimeters
Specification Met	CE
Measurement Type	Ohmmeter
UPC	788537553533
Manufacturer	Zhangzhou Eastern Intelligent Meter Co., Ltd
Global Trade Identification Number	00788537553533
Model number	EM480B
Number of Memory Sticks	1
Item Weight	500 g
Product Dimensions	17 x 6.5 x 11 cm; 500 g
Item model number	EM480B
Item Height	11 Centimeters
Item Width	6.5 Centimeters
Included Components	Test Lead1 pair; English Manual; Belt1;Storage Bag*1;
Are batteries included?	Yes

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

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