Search research articles

ABOUT JoVE

Overview Leadership Blog JoVE Help Center

AUTHORS

Publishing Process Editorial Board Scope & Policies Peer Review FAQ Submit

LIBRARIANS

Testimonials Subscriptions Access Resources Library Advisory Board FAQ

RESEARCH

JoVE Journal Methods Collections JoVE Encyclopedia of Experiments Archive

EDUCATION

JoVE Core JoVE Business JoVE Science Education JoVE Lab Manual Faculty Resource Center Faculty Site

Terms & Conditions of Use

Related Concept Videos

Controlled-Current Coulometry: Coulometric Titration

Controlled-Current Coulometry: Coulometric Titration

Coulometric titrations are a form of titrimetric analysis where the reagent is generated electrically, and its amount is evaluated based on current and generating time. The electron serves as the standard reagent. The procedure is similar to conventional titrations, such as endpoint detection.
The fundamental requirements for coulometric titrations are (1) 100% efficiency in the reagent-generating electrode reaction and (2) a stoichiometric and preferably rapid reaction between the generated...

Controlled-Current Coulometry: Overview

Controlled-Current Coulometry: Overview

Controlled current coulometry, also known as amperostatic coulometry, is a technique used in electrochemical analysis to measure the quantity of a substance through the controlled passage of current. It involves the application of a constant current to an electrochemical cell containing the analyte of interest. As the current flows through the cell, the analyte undergoes a redox reaction at the electrode surface, resulting in a charge transfer. By monitoring the time required for a certain...

Load-frequency control

Load-frequency control

Load-frequency control (LFC) is vital for maintaining power system stability, ensuring that frequency and power flows remain within acceptable limits during load changes. Turbine-governor control eliminates rotor accelerations and decelerations following load changes. However, a steady-state frequency error persists when the change in the turbine-governor reference setting is zero. In an interconnected power system, each area agrees to export or import a scheduled amount of power through...

Parallel RLC Circuits

Parallel RLC Circuits

Street lamps equipped with RLC surge protectors are an excellent example of applying circuit analysis in practical scenarios. These surge protectors safeguard the lamp's components against sudden voltage spikes.
A simplified parallel RLC circuit model with a DC input source generating a step response is employed in this context. When the switch is turned on, Kirchhoff's current law is applied, leading to a second-order differential equation.

Time and frequency -Domain Interpretation of Phase-lag Control

Time and frequency -Domain Interpretation of Phase-lag Control

Phase-lag controllers are widely used in control systems to improve stability and reduce steady-state errors. A dimmer switch controlling the brightness of a light bulb serves as a practical example of phase-lag control, gradually adjusting the bulb's brightness. Mathematically, phase-lag control or low-pass filtering is represented when the factor 'a' is less than 1.
Phase-lag controllers do not place a pole at zero, but instead influence the steady-state error by amplifying any...

Electrical Energy

Electrical Energy

Using electric appliances for a longer period of time consumes more electrical energy and results in a higher electric bill. The energy produced by the transfer of electrons from one point to another is known as electrical energy. If power is delivered at a constant rate, the electrical energy can be defined as the product of power used by the device for a period of time. The energy unit on electric bills is the kilowatt-hour, where one kilowatt-hour is equivalent to 3.6 × 106 joules.

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by

Same author

From Transient to Stable: Incorporating Electrophiles in Genetically-Encoded and DNA-Encoded Libraries of Peptide-Derived Macrocycles.

Biochemistry·2026

Same author

A Two-Step Synthesis of Covalent Genetically-Encoded Libraries of Peptide-Derived Macrocycles (cGELs) enables use of electrophiles with diverse reactivity.

bioRxiv : the preprint server for biology·2025

Same author

Conference Report: WORKSHOP ON CRITICAL ISSUES IN AIR ULTRAVIOLET METROLOGY Gaithersburg, MD May 26-27, 1994.

Journal of research of the National Institute of Standards and Technology·2023

Same author

Beamcon III, a Linearity Measurement Instrument for Optical Detectors.

Journal of research of the National Institute of Standards and Technology·2023

Same author

Spectral Radiance of a Large-Area Integrating Sphere Source.

Journal of research of the National Institute of Standards and Technology·2017

Same author

Results of a CCPR Intercomparison of Spectral Irradiance Measurements by National Laboratories.

Journal of research of the National Institute of Standards and Technology·2017

Same journal

Precise Numerical Differentiation of Thermodynamic Functions with Multicomplex Variables.

Journal of research of the National Institute of Standards and Technology·2024

Same journal

Characterization of 3-Dimensional Printing and Casting Materials for use in Computed Tomography and X-ray Imaging Phantoms.

Journal of research of the National Institute of Standards and Technology·2024

Same journal

On The Quotient of a Centralized and a Non-centralized Complex Gaussian Random Variable.

Journal of research of the National Institute of Standards and Technology·2024

Same journal

Fast Methods for Finding Multiple Effective Influencers in Real Networks.

Journal of research of the National Institute of Standards and Technology·2024

Same journal

Disinfection of Respirators with Ultraviolet Radiation.

Journal of research of the National Institute of Standards and Technology·2024

Same journal

DNA Origami Design: A How-To Tutorial.

Journal of research of the National Institute of Standards and Technology·2024

See all related articles

Search research articles

Related Experiment Video

Updated: Jul 24, 2025

Light Spot-Based Assay for Analysis of Drosophila Larval Phototaxis

Light Spot-Based Assay for Analysis of Drosophila Larval Phototaxis

Published on: September 27, 2019

Improved Automated Current Control for Standard Lamps.

James H Walker¹, Ambler Thompson¹

¹National Institute of Standards and Technology, Gaithersburg, MD 20899-0001.

Journal of Research of the National Institute of Standards and Technology

|July 5, 2023

Summary

This summary is machine-generated.

Improved lamp current control using 16-bit digital-to-analog conversion significantly enhances radiometric lamp standards. This advancement reduces current uncertainty, leading to more precise spectral irradiance measurements for scientific applications.

Keywords:

control current irradiance lamp radiance radiometry standards

More Related Videos

Design and Implementation of an Automated Illuminating, Culturing, and Sampling System for Microbial Optogenetic Applications

Design and Implementation of an Automated Illuminating, Culturing, and Sampling System for Microbial Optogenetic Applications

Published on: February 19, 2017

Interactive and Visualized Online Experimentation System for Engineering Education and Research

Interactive and Visualized Online Experimentation System for Engineering Education and Research

Published on: November 24, 2021

Related Experiment Videos

Last Updated: Jul 24, 2025

Light Spot-Based Assay for Analysis of Drosophila Larval Phototaxis

Light Spot-Based Assay for Analysis of Drosophila Larval Phototaxis

Published on: September 27, 2019

Design and Implementation of an Automated Illuminating, Culturing, and Sampling System for Microbial Optogenetic Applications

Design and Implementation of an Automated Illuminating, Culturing, and Sampling System for Microbial Optogenetic Applications

Published on: February 19, 2017

Interactive and Visualized Online Experimentation System for Engineering Education and Research

Interactive and Visualized Online Experimentation System for Engineering Education and Research

Published on: November 24, 2021

Area of Science:

Photometry and Radiometry
Electrical Metrology
Optical Engineering

Background:

Accurate radiometric lamp standards are crucial for scientific research and calibration.
Existing power supplies with 12-bit digital-to-analog converters limit current control precision.
This limitation impacts spectral irradiance measurements, particularly for FEL-type lamps.

Purpose of the Study:

To develop and demonstrate a technique for enhanced lamp current control.
To improve the precision of spectral irradiance measurements from radiometric standards.
To address the limitations of commercially available power supplies.

Main Methods:

Implementation of a 16-bit digital-to-analog conversion technique for precise current control.
Characterization of lamp current uncertainty at 8 A, aiming for sub-milliampere precision.
Evaluation of spectral irradiance differences using an FEL-type lamp at 655 nm.

Main Results:

Achieved current control with a relative expanded uncertainty of approximately 1 part in 65536.
Reduced expanded current uncertainty to about 0.1 mA at 8 A.
Demonstrated a spectral irradiance difference of approximately 0.006% for an FEL lamp at 655 nm, a significant improvement over the previous 0.12%.

Conclusions:

The 16-bit DAC technique offers a substantial improvement in radiometric lamp current control.
This enhanced precision is critical for advancing the accuracy of spectral irradiance standards.
The uncertainty of the current measuring shunt resistance remains a limiting factor for further improvements.