• Measures True RMS Voltage
• Accuracy 1%
• High Input Impedance
• High Stablility
• Excellent Linearity

Introduction

ACM-102: True RMS A.C. Millivoltmeter, ACM-102 is based on AD536. This is a completely monolithic integrated circuit which performs true rms-to-dc conversion of any waveform. The true rms value of a waveform is more useful quantity than average rectified value, since it relates directly to the power of the signal. The crest factor compensation scheme of the AD536 allows measurement of highly complex signals with wide dynamic range. The crest factor is often overlooked in determining the accuracy of an ac measurement. Crest factor is defined as the ratio of the peak signal amplitude to the rms value of the signal (C.F.=Vp/Vrms). Input signal is appropriately processed through a FET input wide band, extremely fast settling time, low noise amplifier.

ACM-103: In model ACM-103 besides all features of ACM-102, an IC based 1KHz oscillator followed by a buffer, is in-built. This eliminate the need of an external oscillator for purpose, such as determination of h-parameters of a transistor, bridge measurement etc., where spot frequency of 1KHz is most commonly used.

Applications

Measurement of low signal like microphone outputs e.g. in r.m.s. sound level monitoring
Amplifier frequency response well beyond audio ranges
RMS voltage measurement of modulated signals
Power measurements with external standard resistance

Specifications