The indispensable Digital MultiMeter DMM:
Moving Coil Voltmeters, Ammeters and Resistance Bridge were combined to
make AVO Meters a field
instrument. They were used alongside hand
cranked meggers, current-potential transformers. Valve based
Electronic Instrumentation with Nixie Tube Displays cannot be
forgotten, taking readings from nixie tube displays can be more
satisfying than reading a plain LCD.
The Vacuum Florescent 7 segment display array was popular till very
recent times in some cash registers, calculators.
Talking of cash registers read this story ...
"Busicom (Nippon
Calculating Machine Corp changed its name to Business Computer
Corporation) was a Japanese company that owned the rights to the first
microprocessor but sold them back to Intel."
"The 4004 is the
first computer processor designed and manufactured by chip maker Intel,
which previously made semiconductor memory chips. The chief designers
of the chip were Federico Faggin... and Ted Hoff ... and Masatoshi
Shima of Busicom.."
Then came Semiconductor Transistor Multimeters with a Moving coil
display, after that arrived LED Display based Benchtop Semi-Portable
DMM, which were "IC" Technology. These consumed more power and
big in size. Now you have CMOS, LSI and ASIC based DMM which are light,
small and batteries last longer too.
PC based Virtual
DMM, Voltage modules for PLC or ATE and Wireless or optic
Voltage Transmitters are new and advanced form of Electrical Parameter
Measurement and
Recording.
It would be splendid if some firm developed a kit or App for
measurement using the iPod and iPhone.
Anantha Narayan
Source Files for above DMM Project 20008.zip,
20009.zip, 20010.zip, 20011.zip,
20012.zip, 20013.zip, 20014.zip,
20015.zip, 20016.zip.
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