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Telecom or Communications Instruments

Psophometer Telecom Instrument


Psophometer Wikipedia. I learnt some basic instrumentation when i worked on above Instrument at TMPL. TMPL as it was known decades back was in Service and Sales of many Brands like Racal Dana, Genrad, Data I/O and Electronic Production Machinery

Heuer Instruments - Telecom Test Equipment

This instrument had Auto Range for the Voltage and dB meter. Very rare in those days. I did it with a Window comparator and miniature reed relays.

Psophometer Telecom
                        Instrument

Psophometer from Germany - Here is one that is fully analog, it must be using many transistors and probably Opamps. Maybe Hybrid Opamps, because this Instrument is after the Valve era but maybe before the Opamps came. By the size and front panel we can sense the period when this instrument was used.

Noise and Hum in Audio Circuits


Psophometer from Germany

Transmission Measuring Set

The one above was also made at TMPL, it is a Psophometer which was a true RMS auto-ranging AC dB level meter with weighted filters. The weighted filter has to resemble the audio response curve of the ear. With a built in signal generator in dB settings it becomes a Transmission Measuring Set. This was in the eighties..

The Future Landline Phones