Accession Number:

ADA126980

Title:

A Microcomputer-Based Sampling Digital Voltmeter.

Descriptive Note:

Memorandum rept.,

Corporate Author:

NAVAL RESEARCH LAB WASHINGTON DC

Report Date:

1983-03-31

Pagination or Media Count:

109.0

Abstract:

This report describes a sampling digital voltmeter developed at the Underwater Sound Reference Detachment of the Naval Research Laboratory. It consists of a PDP-1123 microcomputer with up to three channels of analog-to-digital converters capable of making simultaneous measurements on pulsed or continuous sinusoids at frequencies up to 100 kHz. The voltmeters is controlled by ASCII commands on the IEEE-488 bus. Statistical parameters mean, peak, standard deviation, and second joint moment are computed using numerical integration. Sinusoidal parameters amplitude, phase, and harmonic distortion are computed using single-frequency discrete Fourier transforms SFDFT. The digital filtering resulting from the use of the SFDFT can be further enhanced by optional data sequence weighting multiplying the sequence by a given windowing sequency. Computation times may be reduced by optional subsequence averaging. Complete assembly language listings for the voltmeter program are included and described.

Subject Categories:

  • Computer Programming and Software
  • Computer Hardware
  • Test Facilities, Equipment and Methods

Distribution Statement:

APPROVED FOR PUBLIC RELEASE