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{{Plugin Sidebar 2|
{{Plugin Sidebar
title=Tektronix 7D15 |
|manufacturer=Tektronix
summary=225 MHz Frequency Counter |
|series=7000-series scopes
image=Tek-7d15-front.jpg |  
|type=7D15
caption=Tektronix 7D15 |
|summary=225 MHz frequency counter
introduced=1973 |
|image=Tek-7d15-front.jpg
discontinued=1990 |
|caption=Tektronix 7D15
series=[[7000-series scopes]]|
|introduced=1972
manuals=
|discontinued=1990
* [http://w140.com/smb/7d15_sm.pdf Tektronix 7D15 Service (OCR, PDF)]
|designers=Art Metz;Roger McCoy;
|manuals=
* [[Media:070-1433-00.pdf|Tektronix 7D15 Instruction Manual]] (OCR)
* [[Media:7000 Series Digital Plug-In Applications.pdf|7000 Series Digital Plug-In Applications]]
}}
}}
The '''Tektronix 7D15''' is a 225 MHz frequency counter plug-in for [[7000-series scopes]], [[introduced in 1972|introduced in November 1972]].


The '''Tektronix 7D15''' is a 225 MHz frequency counter plug-in for [[7000-series scopes]].  It is optimized for timing measurements, having a 100 MHz oscillator and interval measurement averaging capability.  It has two inputs and can measure frequency, period or time difference.
The 7D15 is optimized for timing measurements, having a 100 MHz oscillator and interval measurement averaging capability.  It has two inputs and can measure frequency, period or time difference.  


The front panel uses [[Connectors#SMB|SMB connectors]] for arming, clock in/out and reset signals.  
The front panel uses [[SMB connector]]s for arming, clock in/out and reset signals. The arming input for channel A is active-high whereas that for channel B is active-low.  When one or both are connected to the scope's delayed gate output, the delayed timebase can be used to select the part of the signal to be counted, e.g. for burst or A-B interval measurements. With this connection, the arming interval is directly visible as the intensified trace in the "A intensified by B" display mode.


==Specifications==
When installed in a horizontal plug-in bay, the 7D15 can use the mainframe's trigger signal as its input.  In a vertical bay, it can display the gate signal. In "true gate" mode, this is the actual counter gate, however, this has a low repeat rate due to the counter's dead time. The "pseudo gate" mode improves this by showing the gate whenever the arming and trigger conditions are met, whether the counter is active or not. A third mode shows channel B's gate.  The gate display signal is also available on a dedicated BNC output that can be routed to a scope input when the 7D15 is installed in a H slot.
[[Category:Specifications needed]] ''please add''


{{BeginSpecs}}
{{SpecGroup | Frequency Mode }}
{{Spec | Input frequency | DC to 225 MHz }}
{{Spec | Resolution | 0.1 Hz min. }}
{{SpecGroup | Period Mode }}
{{Spec | Range | 10 ns to 10<sup>5</sup> s, Averaging ×1, ×10, ×100 or ×1000 }}
{{Spec | Resolution | 10 ps max. }}
{{SpecGroup | Time Interval Mode }}
{{Spec | Range | 6 ns to 10<sup>5</sup> s, Averaging ×1, ×10, ×100 or ×1000 }}
{{Spec | Resolution | 0.1 ns usable }}
{{SpecGroup | Frequency Ratio Mode }}
{{Spec | Range | 10<sup>-7</sup> to 10<sup>4</sup> }}
{{SpecGroup | Totalize Mode }}
{{Spec | Range | 0 to 10<sup>8</sup> counts }}
{{SpecGroup | Manual Stopwatch Mode }}
{{Spec | Range | 0 to 10<sup>5</sup> seconds }}
{{SpecGroup | Inputs CH A + CH B}}
{{Spec | Frequency Range | DC (AC coupled: 5 Hz) to 225 MHz }}
{{Spec | Sensitivity | 100 mV<sub>p-p</sub> (from TRIG SOURCE: 0.5 Div) }}
{{Spec | Max. input | 200 V DC linearly derated to 20 V at 200 MHz }}
{{Spec | Min. pulse width | 5 ns }}
{{Spec | Input impedance | 1 MΩ // 22 pF }}
{{EndSpecs}}
==Links==
* [https://www.amplifier.cd/Test_Equipment/Tektronix/Tektronix_7000_series_special/counter_7D15.htm Tek 7D15 page @ amplifier.cd]
* [http://www.barrytech.com/tektronix/tek7000/tek7d15.html Tek 7D15 page @ barrytech.com]
* [https://www.youtube.com/watch?v=K6NqQur7iHU Tektronix 7D15 Repair and alignment] by Zenwizard Studios @ YouTube
{{Documents|Link=7D15}}
==Internals==
==Internals==


The 7D15 uses a number of Tek-made custom chips.  The [[155-0086-00]], [[155-0087-00]] and [[155-0088-00]] legend generators are specific to this plug-in.  The [[155-0090-00]] or [[155-0171-00]] four decade counter/latch/DAC chips implement the lower six counter digits.  For the topmost two digits, the 7D15 employs ECL counters.  ECL logic requires a -5 V supply, which a switching regulator (board A8) generates from the -15 V rail.
The 7D15 uses a number of Tek-made custom chips.  The [[155-0086-00]], [[155-0087-00]] and [[155-0088-00]] legend generators are specific to this plug-in.  The [[155-0090-00]] or [[155-0171-00]] four decade counter/latch/DAC chips implement the lower six counter digits.  For the topmost two digits, the 7D15 employs ECL counters.  ECL logic requires a −5 V supply, which a switching regulator (board A8) generates from the −15 V rail.


The 5 MHz signal from the (non-ovenized) internal reference crystal oscillator is divided down to a 1 MHz master clock.  Optionally, the 1 MHz can be supplied externally as well.  An internal VCO, phase-locked to the 1 MHz master, produces a 100 MHz input to the counter chain for timing measurements.   
The 5 MHz signal from the (non-ovenized) internal reference crystal oscillator is divided down to a 1 MHz master clock.  Optionally, the 1 MHz can be supplied externally as well.  An internal VCO, phase-locked to the 1 MHz master, produces a 100 MHz input to the counter chain for timing measurements.   
==Links==
* [http://www.amplifier.cd/Test_Equipment/Tektronix/Tektronix_7000_series_special/counter_7D15.htm Tek 7D15 page @ amplifier.cd]
* [http://www.barrytech.com/tektronix/tek7000/tek7d15.html Tek 7D15 page @ barrytech.com]


==Prices==
==Prices==
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|-
|-
!Year
!Year
!Price
! 1973
!2015 value
! 1976
! 1980
! 1984
! 1990
|-
|-
| 1973
!Catalog Price
| align="right" | $1,475
| align="right" | $1,475
| align="right" | $7,840
| align="right" | $1,600
|-
| 1980
| align="right" | $2,200
| align="right" | $2,200
| align="right" | $6,300
| align="right" | $3,200
| align="right" | $4,400
|-
|-
| 1990
!In 2023 dollars
| align="right" | $4,400
| align="right" | $10,000
| align="right" | $7,950
| align="right" | $8,500
| align="right" | $8,100
| align="right" | $9,300
| align="right" | $10,200
|-
|-
|}
|}
==Pictures==
==Pictures==
[[Category:Image needed]] ''please add''


<gallery>
<gallery>
File:Tek-7d15-front.jpg  | 7D15 front  
Tek-7d15-front.jpg  | 7D15 front  
File:Tek-7d15-left.jpg  | 7D15 left side.  Note -5 V switching regulator (board A8) on the far left.
Tek-7d15-left.jpg  | 7D15 left side.  Note -5 V switching regulator (board A8) on the far left.
File:Tek-7d15-right.jpg  | 7D15 right side
Tek-7d15-right.jpg  | 7D15 right side
Cam-01.jpg |  [[Cam switch]] with contacts on both sides of the PCB
Cam-02.jpg |  double-sided switch
Cam-03.jpg |  double-sided switch
Cam-04.jpg |  double-sided switch, bottom-side contacts
Cam-05.jpg |  double-sided switch, through-board pins
Tek 7d15 on.jpg|7D15 powered on
Tek 7d15 front low.jpg
Tek 7844 with 7d15.JPG
</gallery>
</gallery>
==Components==
{{Parts|7D15}}




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