Test-Measurement (Page 2)

History and accomplishments of the General Radio Company, one of America’s first equipment manufacturers for the radio and electronics industry.

General Radio Historical Society

Founded in Cambridge, Massachusetts in 1915, GR provided the tools and instruments that allowed the electronics industry to burgeon into today’s giant that fills our lives with radio, TV, computers, cell phones, DVDs and all the other electronic products in our homes, businesses and automobiles.

General Radio Experimenter

General Radio Experimenter

This pioneer publication first appeared in June 1926 and became the model for many others to follow (most notably the HP Journal). It began with engineers talking to radio amateur customers and gradually changed to engineers talking to other engineers, who might also be customers.

GenRad 1863 Megohmmeter

GenRad 1863 Megohmmeter

The GenRad 1863 Megohmmeter is the choice for production and inspection tests on devices with resistances up to 20 Tohms.

Read more at my EEMetric Genrad Wiki Stub

This is an interesting attempt in the right direction. The bandwidth may be only the audio range, but the first instruments with touch interface for tablets are being built for tablets even by DIY Enthusiasts.

SpecScope from NFX Development

SpecScope is a spectrum analyzer and is the second in the line of engineer applications from NFX Development. The SpecScope incorporates the speed and ease of use to access FFT frequency measurements in a hurry.

Some of the Features

  • Logarithmic/Linear measurements
  • Pinch to zoom in both X and Y axis
  • Selectable No. bin for accuracy versus speed
  • Three settings of spectrum averaging
  • Threshold trigger to hold the peak value
  • Tap to pause and resume measurements (graph is still navigational in this mode)
  • A adjustable sample rate allow analysis from 10 Hz to 22KHz

The PC is now an economic and common equipment at home or office. To interface it to the real world is a step in learning Automation and Robotics. In Automation we have both Industrial and Home.

Experimenting with Home Automation and Building PC based Instruments is the first step. An Electronics card needs to be interfaced by Serial, Parallel or USB Ports.

Some Small VB6 Software Source for Virtual Electronic Instruments are available here for Learning and Developing.

You can Read More about it at my Data Interface Circuits section Computer Data Interface

These Programs use a component Inpout32.dll from Inpout32.dll from Logix4u, Obtain the Source code and License.

These Programs are for Experimentation and Educational purpose, Not Suitable for Commercial Applications. The Orcad 9 Student Edition Design Source also given here.

Project Source – virtual-instrumentation – Examples of Computer Interface to Instruments

Toy Logic Analyzer

These are the Theory and Description Pages for the VB Programs with circuits in this project.

  1. ICL7135 Printer port Voltmeter
  2. Millivolt Source R-2R Ladder D/A
  3. Preset Counter Simulation
  4. Very Simple Logic Analyzer

BitScopes are USB or Ethernet connected PC Based Mixed Signal Oscilloscopes. This means they capture and display one, two or four analog signals and eight logic or timing signals, simultaneously. Any BitScope can be used as a Digital Storage Oscilloscope, Logic State Analyzer, Spectrum Analyzer or Data Recorder.

USB BitScope 310

Bitscope – PC Oscilloscopes And Analyzers

BS325 is a classic 2+8 channel BitScope which combines deep capture high performance mixed signal data acquisition and full network connectivity in one compact unit.

BitScope 325 – PC Oscilloscope

BS325 connects via ethernet and is electrically isolated from the host. USB adapters are also available.

BS325 with third party software

BS325 is user programmable, software extendable and can be integrated with third party software.

To make this easy the BitScope Library is available for BS325. The library can be used to create custom applications or to integrate one or more BS325 units into specialised testing and data acquisition systems.

The library is included as standard with BS325 and is compatible for Windows, Linux and Macintosh platforms.

“The library makes it possible to show on the beams of the oscilloscope over a million quantization steps of signal per second (on the Pentium III machine) – less than one micro-second is sufficient for one signal sample. This software can be used for linking to real-time controlling programs as longer delays in relay of data to the oscilloscope don’t occur.”

RT Software Oscilloscope GUI DLL Library

Universal Real-Time Software Oscilloscope GUI DLL Library

“The library is supplied with a comprehensive description of the program interface and simple examples of its use executed in various different program development environments: MS Visual C++® & Visual Basic®; Borland Delphi® & C++Builder®; MathWorks Matlab® & Simulink®, C# (C Sharp).”

“Applied software emitting data to this oscilloscope obtained data via such communications as serial port (RS232, 422, 485), SSI, USB, CAN bus, Ethernet, GRIB (instrumental interface), via custom-made communications equipment and also by collecting information via a data acquisition card with analog-to-digital converters mounted on the PCI bus-bar of a PC.”

delabs Notes –

I am amazed, i did not notice this. I tried it it, not fully, it seems to be quite versatile. I feel this may be useful for hobbists to try out some experiments in oscilloscope and logic analyzer. It would be good if it was Open Source, it may help developing more instruments.

I am not sure about this Library in terms to actual high speed testing or if it may be developed further. But is it interesting.

For students i feel Bitscope offers some nice tools too. BitScopes are USB or Ethernet connected PC Based Mixed Signal Oscilloscopes.

If you are building LED Lamps and Solar powered lighting, a LUX Meter and a Energy Meter is required to measure what has been achieved. One is the Efficiency of Power Conversion and Other is Illumination comparable to the lighting people are used to.

It would be better like a Mains Supply wiring, 230/110 all houses have a 24V DC Bus for LED and Solar and small appliances on power failure. There is no point stepping down and then stepping up the power. The combined efficiency may become like 60%.

ELM – Lux Meter

“The Lux Meter is usually used to measure illumination. The illumination is how level of luminous flux is falling on a surface area.”

From Hobby Hound – DIY Electronics

From – The Electronic Lives Manufacturing