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P7001: Difference between revisions
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[[File:P7001 front.jpg|thumb|350px|right|Tektronix P7001 front panel]] | |||
The '''Tektronix P7001''' is a digitizer, processor, and memory for the [[7704A]] oscilloscope. | The '''Tektronix P7001''' is a digitizer, processor, and memory for the [[7704A]] oscilloscope. | ||
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to the vertical and horizontal amplifiers. | to the vertical and horizontal amplifiers. | ||
This allows it to fill the memory with data points represented as coordinate pairs, (x1,y1), (x2,y2), (x3,y3), etc. | This allows it to fill the memory with data points represented as coordinate pairs, (x1,y1), (x2,y2), (x3,y3), etc. | ||
It is not necessary that x2 be greater than x1. | It is not necessary that x2 be greater than x1, i.e. the samples can be taken out-of-order with respect to their equivalent time in the waveform. | ||
The signal coming from the acquisition unit enters a fast [[sampling diodes|four-diode | The signal coming from the acquisition unit enters a fast [[sampling diodes|four-diode sample and hold circuit]] where it is sampled at 150 ksamples/sec. | ||
where it is sampled at | |||
Each sample is digitized using a successive-approximation scheme. | Each sample is digitized using a successive-approximation scheme. | ||
The analog to digital converter is made of several chips: | The analog to digital converter is made of several chips: a digital to analog converter, a comparator, and control logic. | ||
a digital to analog converter, a comparator, and control logic. | |||
The P7001 has its own power supply built into it, independent of the power supply in the acquisition unit of the 7704A. | The P7001 has its own power supply built into it, independent of the power supply in the acquisition unit of the 7704A. | ||
It has a backplane with an asynchronous bus and several cards that plug into that bus | It has a backplane with an asynchronous bus and several cards that plug into that bus - | ||
sampler, analog to digital converter, memory, external digital interface, and display electronics. | sampler, analog to digital converter, memory, external digital interface, and display electronics. | ||
Early versions of the P7001 use core memory, later versions use semiconductor RAM. The bus is used for low speed signals. | Early versions of the P7001 use core memory, later versions use semiconductor RAM. The bus is used for low speed signals. | ||
High speed signals are sent through coaxial cables that connect to the cards using Peltola | High speed signals are sent through coaxial cables that connect to the cards using [[Peltola connector]]s. | ||
The Acquisition Unit of the 7704A, the P7001 Processor, and the Display Unit of the 7704A are connected by the | The Acquisition Unit of the 7704A, the P7001 Processor, and the Display Unit of the 7704A are connected by the | ||