NBS 560-Series Random Sampling Timebase: Difference between revisions

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{{Plugin Sidebar
|manufacturer=US National Bureau of Standards
|series=560-series scopes
|type=Random Sampling Timebase
|summary=Random sampling sweep plug-in
|image=Nbs jim andrews random sampling timebase.jpg
|caption=NBS Random Sampling Timebase
|introduced=1972
|discontinued=(?)
|designers=Jim Andrews
|manuals=
* [[Media:NBSIR73-309 Random Sampling Time Base.pdf|NBSIR 73-309 Random Sampling Oscilloscope Time Base, Jim Andrews, June 1973]]
}}
In 1972, [[Jim Andrews]] was employed by the United States National Bureau of Standards (NBS) and built this  
In 1972, [[Jim Andrews]] was employed by the United States National Bureau of Standards (NBS) and built this  
'''random sampling timebase for 560-series mainframes'''.
'''random sampling timebase for 560-series mainframes'''.
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the trace point by point over a period of time that is longer than the persistence of a non-storage scope.
the trace point by point over a period of time that is longer than the persistence of a non-storage scope.


==Pictures==
<gallery>
<gallery>
Nbs jim andrews random sampling timebase.jpg
Nbs jim andrews random sampling timebase.jpg

Revision as of 07:19, 6 December 2023

US National Bureau of Standards Random Sampling Timebase
Random sampling sweep plug-in
NBS Random Sampling Timebase

Compatible with 560-series scopes

Produced from 1972 to (?)

Manuals
(All manuals in PDF format unless noted otherwise)
Manuals – Specifications – Links – Pictures

In 1972, Jim Andrews was employed by the United States National Bureau of Standards (NBS) and built this random sampling timebase for 560-series mainframes.

The motivation for this plug-in was that NBS needed to measure pulse signals with fast rise time but very low repetition rate. Tektronix offered the 3T2 random sampling timebase, but it wasn't intended for very low repetition rates. A prototype of the instrument was built and a report was written. The report includes schematics.

The timebase was intended for use in a Tektronix 564 mainframe. The bistable storage of the 564 is essential for the low rep rate measurement, i.e., the ability to accumulate the trace point by point over a period of time that is longer than the persistence of a non-storage scope.

Pictures

  • The power supply is at the left. The board at the top is the strobe predictor. The board at the bottom is the horizontal amplifier.

    The power supply is at the left. The board at the top is the strobe predictor. The board at the bottom is the horizontal amplifier.

IEEE Transactions on Instrumentation and Measurement, Vol. IM-22 No.4, December 1973, p.375+

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