Comparison of a lock-in amplifier and a digital sampling voltmeter as null detectors for differential measurements between sinusoidal and stepwise approximated ac signals

Author

Georgakopoulos, D. ; Budovsky, I. ; Palafox, L.

Author_Institution

Nat. Meas. Inst., Lindfield, NSW, Australia

fYear

2010

fDate

13-18 June 2010

Firstpage

60

Lastpage

61

Abstract

This paper presents the results of using two different types of a null detector, a lock-in amplifier and a digital sampling voltmeter, to measure the difference between a sinusoidal and a stepwise approximated AC voltage generated by means of a programmable Josephson voltage standard. Preliminary results of ac-dc difference measurement made on a thermal converter using the two null detectors agree within 0.5 μV/V at 10 Hz and 20 Hz.

Keywords

amplifiers; convertors; digital voltmeters; measurement systems; ac-dc difference measurement; differential measurements; digital sampling voltmeter; frequency 10 Hz; frequency 20 Hz; lock-in amplifier; null detectors; programmable Josephson voltage standard; sinusoidal approximated ac signals; stepwise approximated ac signals; Analog-digital conversion; Australia; Detectors; Differential amplifiers; Electromagnetic measurements; Instruments; Sampling methods; Synchronization; Voltage; Voltmeters;

fLanguage

English

Publisher

ieee

Conference_Titel

Precision Electromagnetic Measurements (CPEM), 2010 Conference on

Conference_Location

Daejeon

Print_ISBN

978-1-4244-6795-2

Type

conf

DOI

10.1109/CPEM.2010.5543392

Filename

5543392