Test-Measurement (Page 3)

An inductance / capacitance meter by Phil Rice VK3BHR, Almost as published in Amateur Radio magazine, April 2004.

A Surprisingly Accurate Digital LC Meter

Phil Rice – vk3bhr – Home Page

 LC-Meter“The AADE web site gave details of how their design worked and a circuit diagram. This led me to propose a design using their oscillator, but in a slightly different way. Like theirs, mine would measure the free running frequency of an LC oscillator, then successively apply a known capacitance then the unknown inductor (or capacitor).”

Der hier vorgestellte Nachbau des LC-Meter von VK3BHR, Phil Rice, verwendet einen PIC 16F84 und eine Punktmatrixanzeige. Der Messbereich geht in etwa von 0 bis 10 mH für Induktivitäten und von etwa 0 bis 100 nF für Kapazitäten.

LC-Meter nach VK3BHR mit PIC 16F84

HP Archive  – This site is run by Glenn Robb, an Electrical Engineer and HP aficionado. It’s goal is to help others collect, preserve and enjoy vintage HP equipment and literature.

Online Museum of Hewlett-Packard – Ken

“This web site is devoted to the history of test equipment produced by the Hewlett-Packard Company which is now known as Agilent Technologies. I own a huge collection of vintage Hewlett-Packard test equipment, catalogs, equipment manuals, and Hewlett-Packard Journals” –  Kenneth A. Kuhn.

HP’s Instrumentation and Technologies Division became Agilent, Recently Keysight a new firm sprang from Agilent as the Heir to the Scopes, Meters, Oscillators and Counters. So in this blog we are relating to Keysight as the continuation of the old HP tradition of Test and Measurement.
(The present hp is a computer company and agilent a health care firm)

Online Museums of Hewlett-Packard


Their first business location in the Santa Clara Valley is the now iconic garage located at 367 Addison Avenue in Palo Alto. Here they manufacture the company’s first product, the 200A Audio Oscillator. Disney Studios becomes interested in the 200A and orders eight to be used in the production of their movie, Fantasia.

Keysight Technologies History

“As the company moves into this decade it undergoes a major transformation. In 2013 Agilent Technologies announces that it will split into two separate pure-play measurement companies. The name of the new electronic measurement company is announced later in the year as Keysight Technologies.”

The HP Garage is a private museum where the company Hewlett-Packard (HP) was founded. It is located at 367 Addison Avenue in Palo Alto, California. It is considered to be the “Birthplace of Silicon Valley”

HP Memory Project – Vintage Hewlett Packard
“The HP Memory Project is, first of all, a collection of vintage Hewlett-Packard hardware, software, documentation and other technical and marketing materials from HP’s early years in the instrumentation and computer industry (beginning in 1939).

,David Jones -Tronnort Technology

PCB Design Tutorial – As published in Silicon Chip magazine Oct-Dec 2003. A very comprehensive three part tutorial on how to professionally design and lay out PCBs. Learn all the tricks of the trade! A ground breaking article.

10MHz DDS Function Generator – A very low cost 1Hz to 10MHz sine/square function generator using a novel “sliding window” display. Based on the Analog Devices AD9835 DDS chip.


Low Cost 20MHz Function Generator – A 20MHz+ Sine/Square/Triangle function generator based on the Maxim MAX038 chip.

PC Based Digital Storage Oscilloscope Adaptor- A simple and low cost PC Based digital storage scope using a novel architecture.

FSM Compiler Based PLC- A simple and low cost Programmable logic controller based on the Finite State Machine concept. Complete with custom compiler software and source code.