HP 2748B High Speed Rack Mount Paper Tape Reader
© Brooke Clarke 2013 |
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When I first saw the HP 2116 computer in a rack mount controlling a Network Analyzer the paper tape input device was this one. But since the computer had magnetic core memory when the power was turned off and the rack unplugged, the computer retained it's memory so the reader was not often used.
This unit weighs 40 pounds. The top cover is steel, not aluminum (maybe for shielding?).
I'm guessing that the reason for the high voltage inside the box is part of the motor drive so that the motor can start and stop very quickly.
If low voltage (less than 42 Volts) was used to drive the motor it's response time would be much longer. This depends on the time constant
of a circuit composed of inductance and resistance which is given by:
Time Constant = L / R, so making R higher speeds up the circuit, but in order to get the required current the drive voltage needs to be high.
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Page created 3 May 2013.
