P7001: Difference between revisions
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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. | |||
It has a backplane with an asynchronous | It has a backplane with an asynchronous | ||
bus and several cards that plug into that bus: sampler, analog to digital converter, | bus and several cards that plug into that bus: | ||
sampler, analog to digital converter, | |||
memory, external digital interface, and display electronics. | memory, external digital interface, and display electronics. | ||
Early versions of the P7001 use core memory. Later versions | Early versions of the P7001 use core memory. | ||
use semiconductor RAM. The P7001 assumes a | Later versions use semiconductor RAM. | ||
periodically samples the horizontal and vertical | |||
signals simultaneously. This allows it to fill the memory with data points represented | The design of the P7001 assumes | ||
as coordinate pairs, (x1,y1), (x2,y2), (x3,y3), etc. | it will be part of a 7704A system, | ||
and that the 7704A will be | |||
displaying a steady trace. | |||
The vertical and horizonal plug-ins | |||
control the beam as they would | |||
in any 7000-series scope. | |||
The P7001 periodically samples | |||
the horizontal and vertical signals simultaneously | |||
as they pass from the plug-ins | |||
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. | |||
It is not necessary that x2 be greater than x1. | It is not necessary that x2 be greater than x1. | ||
The samples can be taken out-of-order with respect to their | The samples can be taken out-of-order | ||
equivalent time in the waveform. | with respect to their equivalent time in the waveform. | ||
The signal coming from the acquisition unit enters a fast [[sampling diodes|four-diode]] sample and hold circuit | The signal coming from the acquisition unit enters | ||
a fast [[sampling diodes|four-diode]] sample and hold circuit | |||
where it is sampled at 150Ksamp/sec. | where it is sampled at 150Ksamp/sec. | ||
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 from the power supply | The P7001 has its own power supply built into it, | ||
in the acquisition unit of the 7704A. The bus is used for low speed signals. High speed | independent from the power supply | ||
signals are sent through coaxial cables that connect to the cards using Peltola connectors. | in the acquisition unit of the 7704A. | ||
The bus is used for low speed signals. | |||
High speed signals are sent through coaxial cables | |||
that connect to the cards using Peltola connectors. | |||
The Acquisition Unit of the 7704A, the P7001 Processor, and the Display Unit of the 7704A | The Acquisition Unit of the 7704A, | ||
are connected by the Acquisition-Processor-Display (APD) Interface shown below. | the P7001 Processor, | ||
and the Display Unit of the 7704A | |||
are connected by the | |||
Acquisition-Processor-Display (APD) Interface | |||
shown below. | |||
[http://w140.com/p7001 Tektronix P7001 Manuals (PDF)] | [http://w140.com/p7001 Tektronix P7001 Manuals (PDF)] | ||
Revision as of 06:17, 24 September 2013
The Tektronix P7001 is a digitizer, processor, and memory for the 7704A oscilloscope. 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. Early versions of the P7001 use core memory. Later versions use semiconductor RAM.
The design of the P7001 assumes it will be part of a 7704A system, and that the 7704A will be displaying a steady trace. The vertical and horizonal plug-ins control the beam as they would in any 7000-series scope. The P7001 periodically samples the horizontal and vertical signals simultaneously as they pass from the plug-ins 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. It is not necessary that x2 be greater than x1. 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 four-diode sample and hold circuit where it is sampled at 150Ksamp/sec. Each sample is digitized using a successive-approximation scheme. The analog to digital converter is made of several chips: a digital to analog converter, a comparator, and control logic. The P7001 has its own power supply built into it, independent from the power supply in the acquisition unit of the 7704A. The bus is used for low speed signals. High speed signals are sent through coaxial cables that connect to the cards using Peltola connectors.
The Acquisition Unit of the 7704A, the P7001 Processor, and the Display Unit of the 7704A are connected by the Acquisition-Processor-Display (APD) Interface shown below.
Sample and Hold Card
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Vertical sampling bridge
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Horizontal sampling bridge
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Sampling strobe generator
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Sample and hold edge connector
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Sample and hold transformers
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Sample and hold transformer
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Sample and hold rear
Manuals are here: http://w140.com/p7001/
<gallery> Image:P7001 front.jpg|Front panel Image:P7001 top.jpg|Top view Image:P7001 bus front.jpg|Front of backplane Image:P7001 bus back.jpg|Rear of backplane Image:P7001 connector3.jpg|Interunit connector Image:P7001 connector2.jpg|Interunit connector Image:P7001 connector1.jpg|Interunit connector Image:P7001 dpo controller.jpg|Controller card Image:P7001 dpo controller board.jpg|Controller card Image:P7001 dpo controller back.jpg|Controller card Image:P7001 diode decoder.jpg|Address decoder Image:P7001 core boards.jpg|Core boards Image:Core mat.jpg|Core memory Image:Core20.jpg|Core closeup Image:Core17.jpg|Core closeup Image:P7001 ps.jpg|Switching power supply Image:P7001 z-axis front panel rear.jpg|Z-axis and panel controller Image:P7001 z-axis front panel.jpg|Z-axis and panel controller Image:P7001 readout interface.jpg|Readout interface Image:P7001 front panel connections.jpg|Front panel connections Image:P7001 display generator rear.jpg|Display generator rear Image:P7001 display generator.jpg|Display generator Image:P7001 adc rear.jpg|ADC rear Image:P7001 adc probe points.jpg|Probe points on ADC Image:P7001 adc.jpg|ADC Image:P7001 ps1.jpg|Power supply schematic 1 Image:P7001 ps2.jpg|Power supply schematic 2 Image:P7001 apd interconnect.jpg|APD Interconnect <gallery>