928
edits
P7001: Difference between revisions
Added a little description of the A/D converters desgin flaw and some links to Tek magazines.
(Added pics of DPO Camac Interface) |
(Added a little description of the A/D converters desgin flaw and some links to Tek magazines.) |
||
| Line 144: | Line 144: | ||
</gallery> | </gallery> | ||
The A/D Converter uses a successive approximation technique to digitize the vertical and horizontal samples. The vertical resolution is 10 bits, the horizontal resolution 9 bits. It is worth mentioning that the vertical part of the signal is digitized in a range of 10 divisions. As a result, even signal components that are slightly above or below the screen edge are captured. A two bit memory location code (A, B, C or D) is added to the converted horizontal data. The result is the direct memory address at which the vertical data is stored to. For sweeps slower or equal to 500 μs/Div all 512 waveform points are digitized in one sweep. For faster sweep speeds the samples will be taken out-of-order with respect to their equivalent time in the waveform. In this case subsequent sweeps are needed complete the digitized data. The computer has direct access to the register of the A/D converter and may at any time read the last vertical sample. This makes it possible to create arrays with more than 512 elements. | The A/D Converter uses a successive approximation technique to digitize the vertical and horizontal samples. The vertical resolution is 10 bits, the horizontal resolution 9 bits. It is worth mentioning that the vertical part of the signal is digitized in a range of 10 divisions. As a result, even signal components that are slightly above or below the screen edge are captured. A two bit memory location code (A, B, C or D) is added to the converted horizontal data. The result is the direct memory address at which the vertical data is stored to. For sweeps slower or equal to 500 μs/Div all 512 waveform points are digitized in one sweep. For faster sweep speeds the samples will be taken out-of-order with respect to their equivalent time in the waveform. In this case subsequent sweeps are needed complete the digitized data. The computer has direct access to the register of the A/D converter and may at any time read the last vertical sample. This makes it possible to create arrays with more than 512 elements. | ||
====Design Flaw of the A/D Converter==== | |||
<gallery> | |||
Tek_P7001_ADC_designflaw01.jpg | |||
</gallery> | |||
The dynamic range of the sampled waveform is greater than the converted output of the A/D converter. Any sampled point which is left to the crt viewing area will be added to memory location 0 and any point which is right to the crt viewing area will be added to memory location 511. The end points (0 and 511) of the acquired waveform data should be considered invalid for measurement purposes. [[Media:ServiceTekNotes 25 Sep 1982.pdf|ServiceTekNotes Issue 25, Sep 1982]] describes the problem and shows a possible solution. | |||
===Hardware Signal Averager=== | ===Hardware Signal Averager=== | ||
| Line 269: | Line 275: | ||
'''Semiconductor memory (optional)''' | '''Semiconductor memory (optional)''' | ||
<gallery> | <gallery> | ||
Image needed.jpg|1K semiconductor memory | |||
P7001 2k memory.jpg|2K semiconductor memory (aka "MOS") | P7001 2k memory.jpg|2K semiconductor memory (aka "MOS") | ||
</gallery> | </gallery> | ||
| Line 434: | Line 441: | ||
Tek_P7001_advertising_1977.pdf|Typical DPO advertising in 1977 | Tek_P7001_advertising_1977.pdf|Typical DPO advertising in 1977 | ||
</gallery> | </gallery> | ||
==Appearance in Tektronix Magazines== | |||
* [[Media:ServiceTekNotes 25 Sep 1982.pdf|ServiceTekNotes Issue 25, Sep 1982 about the A/D converters design flaw]] | |||
* [[Media:Tekscope 1973 V5 N2 Mar 1973.pdf | TekScope Vol. 5 No. 2, Mar-Apr 1973 about the introduction of the P7001]] | |||
===Firmware (uploaded BIN files) === | ===Firmware (uploaded BIN files) === | ||
| Line 453: | Line 464: | ||
[[Category:7000 series non-storage mainframes]] | [[Category:7000 series non-storage mainframes]] | ||
[[Category:Digital storage scopes]] | [[Category:Digital storage scopes]] | ||
[[Category:GPIB interface]] | [[Category:GPIB interface]] | ||
[[Category:Image needed]] | |||