Calibration of lock-in amplifiers in the low-frequency range

Alessandro Cultrera, Ngoc Thanh Mai Tran, Vincenzo D’Elia, Massimo Ortolano, Luca Callegaro

Abstract

A setup for the calibration of lock-in amplifiers in the low frequency range is presented. The setup is based on an uncalibrated voltage source, an ac voltmeter, and calibrated inductive and resistive voltage dividers. The measurand is the relative deviation of the lock-in amplifier reading from the calibrated applied voltage. Examples of calibration of a commercial lock-in amplifier in the 10 µV range, at frequencies of 17 Hz and 103 Hz, are given; the calibration uncertainty, relative to the instrument full-scale, is under evaluation and expected to be of the order of 10^-4 .

Keywords

calibration, linearity, demodulation, mesaurement techniques, voltage measurement, signal detection, gain error, lock-in amplifier

Download

IMEKO-TC4-2019-027.pdf

DOI

-

IMEKO TC

TC4 - Measurement of Electrical Quantities

Back to the proceedings