The 8506A 6 1/2 Digit Digital Multimeter uses a fast thermal rms sensing technique for measuring ac which very significantly advances the state-of-the-art for ac measurements using a system DMM. It is several times more accurate than the calculating type of 1-rms converter and is unmatched by any other DMM. Basic ac accuracy uncertainty is reduced to 120 parts per million, 24 hours for frequencies from 40Hz to 20kHz. DC voltage to 1000 V. AC voltage to 500 Vrms.
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