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7D14: Difference between revisions
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{{Plugin Sidebar | {{Plugin Sidebar | ||
|manufacturer=Tektronix | |||
summary=525 MHz frequency counter| | |series=7000-series scopes | ||
image= | |type=7D14 | ||
caption=7D14 front view | |summary=525 MHz frequency counter | ||
introduced= | |image=7d14-front.jpg | ||
discontinued=1980 | | |caption=7D14 front view | ||
|introduced=1970 | |||
|discontinued=1980 | |||
* [ | |designers=Art Metz | ||
|manuals= | |||
* [[Media:070-1097-00.pdf|Tektronix 7D14 Service]] (OCR) | |||
* [[Media:070-1663-00.pdf |Tektronix 7D14 Service, SN B050000+]] | |||
* [[Media:7000 Series Digital Plug-In Applications.pdf|7000 Series Digital Plug-In Applications]] | |||
}} | }} | ||
The '''Tektronix 7D14''' is a 525 MHz frequency counter plug-in for [[7000-series scopes|7000 series mainframes]]. | The '''Tektronix 7D14''' is a 525 MHz frequency counter plug-in for [[7000-series scopes|7000 series mainframes]]. | ||
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In a vertical compartment, the trigger signal (i.e. the "shaped" input) can be displayed as the module's Y output. | In a vertical compartment, the trigger signal (i.e. the "shaped" input) can be displayed as the module's Y output. | ||
{{BeginSpecs}} | {{BeginSpecs}} | ||
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}} | }} | ||
{{EndSpecs}} | {{EndSpecs}} | ||
==Internals== | |||
An input section using relays selects the counter signal from the internal trigger path or external input, and activates 50 Ω termination and/or attenuators. | |||
A differential FET buffer + bipolar amplifier stage drives a counter gate that uses a 10 mA [[tunnel diode]] as the switching element. | |||
The first counter decade is implemented as a divide-by-2 ECL flip-flop (U329) followed by a five-stage ring counter made with discrete transistor pairs (note circular layout) and some logic to BCD-encode the count result. | |||
In early 7D14 units (board 388-1825-00), U329 was a Tek made IC, [[155-0046-00]], which was not used in other instruments. From SN B050000 on, a standard ECL part ([[156-0377-00]]) was used on a a redesigned high-frequency counter board (670-0993-01). | |||
The following seven counter stages are conventional TTL decade ripple counters (N8292A). | |||
The counter outputs are multiplexed onto a common 4-bit bus using open-collector NAND gates under control of the mainframe's [[7000 series readout system|readout system]]. The multiplexed digit value feeds a D/A converter (Tek [[155-0038-01]]) that in turn drives the analog row and column returns to the readout system. A separate blanking logic eliminates leading zeroes and displays a ">" sign in the leftmost column if the counter overflows. | |||
==Links== | ==Links== | ||
* [http://www.amplifier.cd/Test_Equipment/Tektronix/Tektronix_7000_series_special/7D14.htm 7D14 page @ amplifier.cd] | * [http://www.amplifier.cd/Test_Equipment/Tektronix/Tektronix_7000_series_special/7D14.htm 7D14 page @ amplifier.cd] | ||
* [http://www.barrytech.com/tektronix/tek7000/tek7d14.html 7D14 page @ barrytech.com] | |||
{{Documents|Link=7D14}} | |||
==Prices== | |||
{| class="wikitable" | |||
|- | |||
!Year | |||
! 1973 | |||
! 1976 | |||
! 1980 | |||
|- | |||
!Catalog Price | |||
| align="right" | $1,400 | |||
| align="right" | $1,550 | |||
| align="right" | $2,075 | |||
|- | |||
!In 2023 Dollars | |||
| align="right" | $9,700 | |||
| align="right" | $8,400 | |||
| align="right" | $7,700 | |||
|- | |||
|} | |||
==Pictures== | ==Pictures== | ||
[[ | <gallery> | ||
7d14-front.jpg | 7D14 front panel. The unit pictured was able to count up to 640 MHz on the external input and 532 MHz on the trigger path (7A19 in 7904). | |||
7d14-left.jpg | 7D14 left side | |||
7d14-right.jpg | 7D14 right side (later 670-0993-01 board) | |||
7d14-input-amp.jpg | 7D14 detail - input amplifier | |||
7d14-gate.jpg | 7D14 detail - counter gate | |||
7d14-div2.jpg | 7D14 detail - 525 MHz divide-by-2 stage (later 670-0993-01 board) | |||
7d14-div5.jpg | 7D14 detail - divide-by-5 discrete ring counter stage | |||
7d14-screen.jpg | 7D14 screen picture - 500 MHz signal counted on trigger path ([[7A19]] amplifier, [[7B92A]] time base in a [[7904]] mainframe) | |||
Tek 7d14 1.jpg | |||
Tek 7d14 2.jpg | |||
Tek 7d14 3.jpg | |||
</gallery> | |||
==Components== | |||
{{Parts|7D14}} | |||
[[Category:Frequency counters]] | [[Category:Frequency counters]] | ||
[[Category:7000 series special-function plugins]] | [[Category:7000 series special-function plugins]] | ||