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Online Auction Description
This is from the surplus of NASA Lewis Research center.
Tektronix DD501 Digital Delay
The DD 501 Digital Delay is an events counting plug-in
unit designed for use in a TM 500-Series Power Module mainframe. Separate
external trigger signals are connected to the EVENTS and START INPUT connectors
allow up to 99,999 events to be counted. That is, the unit counts a
predetermined number of events, from 0 to 99,999, selected by the front-panel
thumb-wheel switches. The last event counted generates a trigger pulse to the DELAYED
TRIGGER OUT connector on the front panel. Delay by event is particularly useful
in troubleshooting asynchronous logic systems. The DD 501 can also function as
a frequency divider when the same signal is applied to both inputs. The DD 501 can
be used in a counted burst mode with pulse or function generators that can be
synchronously gated. This provides the ability to dial up the number of pulses
you want in a burst for applications with shift registers, memories, data
communications, process control, or any system requiring an exact number of
pulses or waveforms. A jumper inside the DD 501 converts the DELAYED TRIGGGER
OUTPUT to a delay interval gate waveform for this application. TEKTRONIX
generators capable of being gated by the DD 501 are the FG 501, FG 502, FG 504
and the PG 508. Other DD 501 applications include ranging for radar, sonar,
ultrasonics, or laser. By using the proper frequency clock, the numbers dialed
up can represent miles, yards, kilometers, etc. In systems requiring precision
timing. several DD 501s and a reference clock can provide precise
thumbwheel-selectable repetition rates, delays, pulse widths, or timing
Iâve seen other units of this type selling for over $850.00
but I need to liquidate my shop and test equiptment,This is in like new
This sale is only for the one plugin unit and does not include the other modules in the mainframe.
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