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


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.


  • 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


Voltage Range 20mV, 200mV, 2V and 20V
Frequency Range 10Hz to 200KHz
Input Impedance 1MW shunted by 25pf on all ranges
Accuracy 1% in the range 10Hz-100KHz; 2% in the range 100KHz-200KHz
Display 3½ digit, 7 segment LED (12.5mm height) with decimal and overflow indication
Power Supply 220V ±10%, 50Hz
Weight 2.5Kg & 3Kg
Accessories Supplied 75cm shielded cable with a coaxial connector at one end and banana plugs on the other end
  ACM-103 (Additional Features)
Oscillator Output 0-300mV continuously variable
Frequency 1KHz fixed


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