The indispensable Digital
Moving Coil Voltmeters, Ammeters and
Resistance Bridge were combined to
make AVO Meters a field instrument.
They were used alongside hand cranked
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
DMM or Digital Multi Meter
Talking of cash registers read this
(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
"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.."
- Smartphone DMM
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
in portable computers.
Source Files for above DMM Project 20008.zip,