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{{Plugin Sidebar| | {{Plugin Sidebar | ||
|manufacturer=Tektronix | |||
summary=Readout Unit| | |series=7000-series scopes | ||
image=7m13- | |type=7M13 | ||
caption=7M13 front panel| | |summary=Readout Unit | ||
|image=Tek-7m13-front.jpg | |||
|caption=7M13 front panel | |||
|introduced=1974 | |||
manuals= | |discontinued=1985 | ||
* [ | |manuals= | ||
* [[Media:070-1577-00.pdf|Tektronix 7M13 Manual]] (OCR) | |||
}} | |||
The '''Tektronix 7M13''' is a "Readout Unit" that allows the user to enter text | |||
into the [[7000 series readout system|scope's readout system]] for that module slot. | |||
It is intended to include identifying text and picture numbers for photographic documentation. | |||
A built-in camera counter displays a pre-settable count in the second (lower) readout channel, | |||
which can be advanced manually by push-button or automatically by the camera shutter. | |||
The only editing function provided is to overwrite the character just entered (by holding the MODIFY button). To correct other errors, one needs to erase the display field. | |||
{{BeginSpecs}} | |||
{{Spec | Character positions | 2 fields (top, bottom) of 10 characters each }} | |||
{{Spec | Camera counter | 0-99, lower field only; ground contact closure input }} | |||
{{EndSpecs}} | |||
==Internals and Repair Issues== | |||
The 7M13 is relatively simple and robust electrically, consisting mostly of 74xx TTL logic. | |||
However, there can be electromechanical problems due to the number of switches. | |||
For example, a 7M13 may appear unresponsive if the "(P)RESET" button for the camera counter is not fully released. | |||
The 7M13 uses four 7489 TTL 16×4 RAMs to store the characters entered, | |||
and four [[155-0038-01]] Tek-made D/A converter chips to drive the analog row/column readout lines. | |||
One RAM and D/A each are assigned to row and column readout signals in each channel, | |||
and are addressed by a counter synchronized to the readout time slot pulses. | |||
In other words, characters are not stored as ASCII bytes, but as row/column pairs | |||
matching the [[Media:Tek7000-readout-charset.jpg|readout system's character set]]. | |||
The keyboard is arranged in a matching matrix of double-contact (DPST) keys | |||
that generate the row/column coordinates through 74147 priority encoders. | |||
==Links== | ==Links== | ||
* http://www. | * [http://www.amplifier.cd/Test_Equipment/Tektronix/Tektronix_7000_series_special/readout_unit_7M13.htm Tek 7M13 page @ amplifier.cd] | ||
* [http://www. | * [http://www.barrytech.com/tektronix/tek7000/tek7m13.html Tek 7M13 page @ barrytech.com] | ||
==Prices== | |||
{| class="wikitable" | |||
|- | |||
! Year | |||
! 1974 | |||
! 1976 | |||
! 1980 | |||
! 1984 | |||
|- | |||
! Catalog price | |||
|align=right| $375 | |||
|align=right| $425 | |||
|align=right| $600 | |||
|align=right| $1,075 | |||
|- | |||
! In 2022 Dollars | |||
|align=right| $2,300 | |||
|align=right| $2,200 | |||
|align=right| $2,200 | |||
|align=right| $3,100 | |||
|- | |||
|} | |||
==Pictures== | ==Pictures== | ||
<gallery> | <gallery> | ||
Tek-7m13-front.jpg | 7M13 front panel | |||
Tek-7m13-right.jpg | 7M13, right side | |||
Tek 7m13 b7.jpg | 7M13, left side | |||
P6202-risetime-7s12-1ns.jpg | Readout example ([[7844]] Opt.78 mainframe) | |||
Tek 7m13 upper front.jpg | |||
Tek 7m13 lower front.jpg | |||
Tek 7m13 b2.jpg | |||
7m13-7633.jpg | 7M13 in [[7633]] | |||
</gallery> | </gallery> | ||
{{Custom ICs|7M13}} | |||
[[Category:7000 series special-function plugins]] | [[Category:7000 series special-function plugins]] | ||