Tuesday, April 22, 2014

Reliability in Axial and Radial Plastic Capacitors

The Axial capacitors like Metalized Polypropylene MPP are more reliable in comparison of their radial counterparts of same voltage rating.

Also note 440V AC Continuous rating reads and translates differently than 630V DC Max. Overrating is an important step in reliability for engineers.

High Energy Circuits

Radial plastic caps, in mass production, due to various inconsistencies in production or quality measurement, are not recommended for high voltage unless its is a Manufacturer known for long term reliability and quality track record.

Reliability in Axial and Radial Plastic Capacitors

The radial caps when being wound, stretches the film/dielectric or weakens the dielectric at some areas as the turn is sharp, top/bot. This is possible unless the winding machine relaxes strain around the turns. In a Axial that may not be a problem as the film has more uniform stretch. The other reason could be that the Film is wrapped a little on corners or compressed on epoxy impregnation. It could also be low quality non-uniform PP material.

Power Electronics & Solar Energy

Components Manufacturers have to spruce up a Raw-Material and Component Quality, not by red-tape but by actually improving the manufacturing and procurement processes, as the quantities involved are huge.

Friday, April 18, 2014

Control Interface to PC Ports

PC based Instrumentation is easy to implement using tools and cards of National Instruments - Test and Measurement. Most instruments can communicate with PC on the GPIB interface.

You can start by learning to use the parallel port and serial port. MIDI-Game port also has enough to help you start, learn computer interfacing at home. Try a small easy experiment RS-232 Powered Temperature Sensor.

Control Interface to PC Ports

This can get you started too. The few examples above show an instrumentation - Logic Analyzer 'Like' interface and a relay-display driver circuit. They are examples i tried for students to try out and learn.

Control Interface to PC Ports.
Project Source - virtual-instrumentation - Examples of Computer Interface to Instruments

Tuesday, April 15, 2014

QCRTGraph Real-Time Graphics Tools for Android

You can develop Android Virtual Instruments with these components. You could integrate scrolling graphs, meters, bar graphs, gauges, annunciators, dynamic text, and UI controls to Android/Java based applications.Instrumentation GUI and Graphics

QCRTGraph Real-Time Graphics Tools for Android Studio

The Real-Time Graphics Tools for Android library, entirely written using Java for the Android platform, is for developers who want to add sophisticated real-time graphics to their Android applications.

The software integrates the QCChart2D charting software with real-time data structures and specialized rendering routines.

QCRTGraph Real-Time Graphics Tools for Android

Process Variable and Alarms - Real-time data is stored in RTProcessVar classes. The RTProcessVar class is designed to represent a single process variable, complete with limit values, an unlimited number of high and low alarms, historical data storage, and descriptive strings for use in displays.

Panel Meter Indicators - The RTPanelMeter derived classes are special cases of the single value indicator classes that are used throughout the software to display real-time data in a text format. Panel meters are available for numeric values, string values, time/date values and alarm values.

Alarm Indicators - Alarm indicators are used to display alarm lines, symbols and fill areas for the RTProcessVar objects associated with the single value and multiple value indicator classes.

Quinn-Curtis is a leading supplier of real-time graphics tools software, for Windows, .Net, and Java platforms.

Quinn-Curtis
18 Hearthstone Dr., Medfield, MA 02052 USA

Saturday, April 12, 2014

Pin Note Web Gadget

This is a Tiny memo Pad that will have Sticky Notes on Webpage, saves in cookies. This Web Gadget was for the Google Homepage, Web-page or blog. Pin Notes

The inspiration for this has been Stickies. Which i have been using for some time.Add to your Page or Blog - Pin Notes xml code - you need to use only the iframe part.

Screenshot and help of Gadget

Pin Note Web Gadget

Note - This is toy or fun gadget not for serious note taking, it is more an example of css-dhtml-js for study or learning.

24 March 2010 - Data Freedom in PSV, Pipe Separated like | and ||. Now you can move to a competing Notes Service Provider if you feel our interface or features are not just right. 

Development

This was later enhanced to the Jot a Note gadget. Jot a Note then became Jot Desktop.