7D14: Difference between revisions

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{{Plugin Sidebar 2|
{{Plugin Sidebar
title=Tektronix 7D14|
|manufacturer=Tektronix
summary=525 MHz frequency counter|
|series=7000-series scopes
image=7d14-front.jpg |  
|type=7D14
caption=7D14 front view (manual)|
|summary=525 MHz frequency counter
introduced=1971 |
|image=7d14-front.jpg
discontinued=1980 |
|caption=7D14 front view
series=[[7000-series scopes]]|
|introduced=1970
manuals=
|discontinued=1980
* [http://w140.com/smb/7d14_sm.pdf Tektronix 7D14 Service (OCR, PDF)]
|designers=Art Metz
* [[Media:7000 Series Digital Plug-In Applications.pdf|7000 Series Digital Plug-In Applications (PDF)]]
|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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A differential FET buffer + bipolar amplifier stage drives a counter gate that uses a 10 mA [[tunnel diode]] as the switching element.  
A differential FET buffer + bipolar amplifier stage drives a counter gate that uses a 10 mA [[tunnel diode]] as the switching element.  


The first decade is implemented as a divide-by-2 ECL flip-flop ([[156-0377-00]]) followed by a 5-stage ring counter made with discrete transistor pairs (note circular layout) and some logic to BCD-encode the count result.
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 following seven counter stages are conventional TTL decade ripple counters (N8292A).
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* [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]
* [http://www.barrytech.com/tektronix/tek7000/tek7d14.html 7D14 page @ barrytech.com]
{{Documents|Link=7D14}}


==Prices==
==Prices==
Line 57: Line 62:
! 1980
! 1980
|-
|-
!Price
!Catalog Price
| align="right" | $1,400
| align="right" | $1,400
| align="right" | $1,550
| align="right" | $1,550
| align="right" | $2,075
| align="right" | $2,075
|-
|-
!2015 value
!In 2023 Dollars
| align="right" | $7,450
| align="right" | $9,700
| align="right" | $6,430
| align="right" | $8,400
| align="right" | $5,950
| align="right" | $7,700
|-
|-
|}
|}
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==Pictures==
==Pictures==
<gallery>
<gallery>
File: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-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).
File:7d14-left.jpg      | 7D14 left side
7d14-left.jpg      | 7D14 left side
File:7d14-right.jpg    | 7D14 right side
7d14-right.jpg    | 7D14 right side (later 670-0993-01 board)
File:7d14-input-amp.jpg | 7D14 detail - input amplifier
7d14-input-amp.jpg | 7D14 detail - input amplifier
File:7d14-gate.jpg      | 7D14 detail - counter gate
7d14-gate.jpg      | 7D14 detail - counter gate
File:7d14-div2.jpg      | 7D14 detail - 525 MHz divide-by-2 stage
7d14-div2.jpg      | 7D14 detail - 525 MHz divide-by-2 stage (later 670-0993-01 board)
File:7d14-div5.jpg      | 7D14 detail - divide-by-5 discrete ring counter stage
7d14-div5.jpg      | 7D14 detail - divide-by-5 discrete ring counter stage
File:7d14-screen.jpg    | 7D14 screen picture - 500 MHz signal counted on trigger path ([[7A19]] amplifier, [[7B92A]] time base in a [[7904]] mainframe)
7d14-screen.jpg    | 7D14 screen picture - 500 MHz signal counted on trigger path ([[7A19]] amplifier, [[7B92A]] time base in a [[7904]] mainframe)
File:Tek 7d14 1.jpg  
Tek 7d14 1.jpg  
File:Tek 7d14 2.jpg
Tek 7d14 2.jpg
File:Tek 7d14 3.jpg
Tek 7d14 3.jpg
</gallery>
</gallery>


 
==Components==
{{Parts|7D14}}


[[Category:Frequency counters]]
[[Category:Frequency counters]]
[[Category:7000 series special-function plugins]]
[[Category:7000 series special-function plugins]]

Latest revision as of 03:31, 10 October 2023

Tektronix 7D14
525 MHz frequency counter
7D14 front view

Compatible with 7000-series scopes

Produced from 1970 to 1980

Manuals
Manuals – Specifications – Links – Pictures

The Tektronix 7D14 is a 525 MHz frequency counter plug-in for 7000 series mainframes.

It uses the mainframe's readout system to display an eight-digit count on the CRT. Modes include frequency, frequency ratio and events count using manual or external gate.

When installed in a horizontal compartment, it can count the trigger pickoff from a vertical amplifier unit. This allows simultaneous viewing and counting of a signal in four-bay mainframes.

In a vertical compartment, the trigger signal (i.e. the "shaped" input) can be displayed as the module's Y output.

Key Specifications

Frequency 525 MHz (5 MHz bandwidth limiting switch available)
Sensitivity 100 mV to 10 V
Input Impedance 50 Ω or 1 MΩ // 20 pF on external input, 1.5 Div internal when set to "Trig Source"
Gate time 1 ms to 10 s
Display time 0.1 s to 5 s or infinite
Features
  • Gate monitor output / Ext Gate input (BSM)
  • 1 MHz reference monitor output / Ext Ref input (BSM)

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 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

Documents Referencing 7D14

Document Class Title Authors Year Links
Tekscope 1971 V3 N1 Jan 1971.pdf Article Digital Counter and Multimeter 1971 7D14 • 7D13
Tekscope 1971 V3 N5 Sep 1971.pdf Article The 7D14 Counts Current to Minimize Circuit Loading Emory Harry 1971 7D14 • P6041 • CT-1
Tekscope 1972 V4 N2 Mar 1972.pdf Article A Review of Basic Counter Principles Ray Herzog 1972 7D14
Tekscope 1975 V7 N5.pdf Article Delayed Gate Aids Oscilloscope Digital Measurements Dave McCullough 1975 7D12 • 7D14 • 7D15 • 7B53A
7000 Series Digital Plug-In Applications.pdf Application Note 7000 Series Digital Plug-In Applications 1977 7D10 • 7D11 • 7D12 • 7D13 • 7D14 • 7D15

Prices

Year 1973 1976 1980
Catalog Price $1,400 $1,550 $2,075
In 2023 Dollars $9,700 $8,400 $7,700

Pictures

  • 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 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 side

    7D14 left side

  • 7D14 right side (later 670-0993-01 board)

    7D14 right side (later 670-0993-01 board)

  • 7D14 detail - input amplifier

    7D14 detail - input amplifier

  • 7D14 detail - counter gate

    7D14 detail - counter gate

  • 7D14 detail - 525 MHz divide-by-2 stage (later 670-0993-01 board)

    7D14 detail - 525 MHz divide-by-2 stage (later 670-0993-01 board)

  • 7D14 detail - divide-by-5 discrete ring counter stage

    7D14 detail - divide-by-5 discrete ring counter stage

  • 7D14 screen picture - 500 MHz signal counted on trigger path (7A19 amplifier, 7B92A time base in a 7904 mainframe)

    7D14 screen picture - 500 MHz signal counted on trigger path (7A19 amplifier, 7B92A time base in a 7904 mainframe)

Components

Some Parts Used in the 7D14

Part Part Number(s) Class Description Used in
155-0038-01 155-0038-00 • 155-0038-01 Monolithic integrated circuit 5-bit current source D/A converter 7A42 • 7D13 • 7D14 • 7M13 • T4005
155-0046-00 155-0046-00 Monolithic integrated circuit high-speed divider 7D14
SMTD994 152-0177-01 Discrete component 10 mA, 2 pF tunnel diode 067-0587-01 • 067-0580-00 • 3T5 • 3T6 • 485 • 5S14N • 7D14 • 7T11 • 7T11A • S-53
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