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{{Plugin Sidebar 2|
{{Plugin Sidebar
title=Tektronix 7L5|
|manufacturer=Tektronix
summary=5 MHz Spectrum Analyzer|
|series=7000-series scopes
image=Tek 7l5 1.jpg|
|type=7L5
caption=Tektronix 7L5 |
|summary=5 MHz Spectrum Analyzer
introduced=1976 |
|image=Tek 7l5 1.jpg
discontinued=1989 |
|caption=Tektronix 7L5
series=[[7000-series scopes]]|
|introduced=1976
manuals=
|discontinued=1989
* [http://bama.edebris.com/download/tek/7l5/7l5-spectrum-analyzer.pdf Tektronix 7L5 Manual (PDF)]
|designers=Fendall Winston;Craig Bryant;Steve Morton;Bill Benedict;Don Kirkpatrick;Steve Skidmore;Carlos Beeck;Morris Engelson
* [http://w140.com/smb/7L5_Op.pdf  Tektronix 7L5 Operators Manual (OCR, PDF)]
|manuals=
* [http://w140.com/smb/7l5_sm.pdf Tektronix 7L5 Manual (OCR, PDF)]
* [[Media:070-1734-00.pdf|Tektronix 7L5 Operators Manual -00]] (OCR)
* [http://pcbunn.cacr.caltech.edu/jjb/Tektronix/7L5/Tek_7L5_Options.pdf Tektronix 7L5 Options Manual (PDF)]
* [[Media:070-1734-01.pdf|Tektronix 7L5 Operators Manual -01]] (OCR)
* [[Media:070-2184-01.pdf|Tektronix 7L5 Service Manual]] (OCR)
* [[Media:070-2155-03.pdf|Tektronix 7L5 Options Manual]] (OCR) <small>(1982 version; options 32 and 33 only covered as 1983 addendum page)</small>
 
<small>
'''Calibration'''
* [[Media:Tek 7L5 factory cal september 1975.pdf|Tektronix 7L5 Factory Calibration Procedure]]
 
'''Application Notes'''
* [[Media:AX-3406-1.pdf|EMI Applications using the Spectrum Analyzer]]
* [[Media:AX-3535.pdf|Crystal Device Measurements using the Spectrum Analyzer]]
 
<small>
'''Alternate copies'''
* [https://bama.edebris.com/download/tek/7l5/7l5-spectrum-analyzer.pdf Tektronix 7L5 Manual] @ BAMA
* [http://pcbunn.cithep.caltech.edu/jjb/Tektronix/7L5/7l5-spectrum-analyzer.pdf Military PL-1391/U manual] (Text)
* [http://pcbunn.cacr.caltech.edu/jjb/Tektronix/7L5/Tek_7L5_Options.pdf Tektronix 7L5 Options Manual] (PDF)
</small>
}}
}}
The '''Tektronix 7L5''' is a low frequency (10 Hz – 5 MHz) spectrum analyzer plug-in for [[7000-series scopes]]. 
It has built-in digital storage, so it will work fine in non-storage mainframes such as the large-screen [[7603]].
It also features digital scale and marker level/frequency (6 digits) readout, and a "max hold" function.


The '''Tektronix 7L5''' is a low frequency (10 Hz – 5 MHz) spectrum analyzer plug-in for [[7000-series scopes]].
According to the 070-2184-01 manual, instruments with a serial number below Β070000 are missing the ''B − (Save A)'' feature and the corresponding button on the front panel. The military version is called PL-1391/U and is also lacking the ''B − (Save A)'' feature.
It has built-in digital storage so it will work fine in non-storage mainframes, such as the large-screen [[7603]].
 
It also features digital scale and marker level/frequency (6 digits) readout, and a "max hold" function.
<blockquote>
Fendall Winston was Project Leader for the 7L5 and along with Craig Bryant and Steve Morton provided much of the electrical design. Bill Benedict and Don Kirkpatrick did the digital circuitry. Steve Skidmore coordinated mechanical design, with Carlos Beeck doing the optoelectronic switch-in-a-knob. Morris Engelson provided overall engineering direction for the program.
</blockquote>


{{BeginSpecs}}
{{BeginSpecs}}
{{Spec|Input frequency    | 10 Hz – 5 MHz}}
{{Spec|Input frequency    | 10 Hz – 5 MHz}}
{{Spec|Drift              | < 5 Hz / hour}}
{{Spec|Drift              | < 5 Hz/h }}
{{Spec|Resolution bandwidth| 10 Hz – 30 kHz in &times;3 / &times;10 steps}}
{{Spec|Resolution bandwidth| 10 Hz – 30 kHz in &times;3 / &times;10 steps}}
{{Spec|Sweep rate          | 10 s /Div to 0.1 ms/Div in 1-2-5 sequence plus Auto}}
{{Spec|Sweep rate          | 10 s/Div to 0.1 ms/Div in 1−2−5 sequence plus Auto}}
{{Spec|Residual FM        | < 40 Hz<sub>p-p</sub> (< 1 Hz from 50 Hz/Div to 2 kHz/Div)}}
{{Spec|Residual FM        | < 40 Hz<sub>p-p</sub> (< 1 Hz from 50 Hz/Div to 2 kHz/Div)}}
{{Spec|Outputs            | Horizontal, Video, Calibrator}}
{{Spec|Outputs            | Horizontal, Video, Calibrator}}
{{Spec|Input impedance|
{{Spec|Input impedance|
* [[L1]] input module: 50 &Omega;
* [[L1]] input module: 50 Ω
* [[L2]] input module: 75 &Omega;
* [[L2]] input module: 75 Ω
* [[L3]] input module: 50 &Omega;, 600 &Omega; or 1 M&Omega; selectable
* [[L3]] input module: 50 Ω, 600 Ω or 1 MΩ selectable (75 Ω, 600 Ω or 1 MΩ for the L3-1)
}}
}}
{{Spec|Log Sweep Option| 250 Hz to 222.25 kHz by digitally combining three decade sweeps (250 Hz—2.25 kHz, 2.25 kHz—22.25 kHz, 22.25 kHz—222.25 kHz), 2.5 s sweep time }}
{{EndSpecs}}
{{EndSpecs}}


====Options====
====Options====
<small>
:{| border="1" cellspacing="0" |
:{| border="1" cellspacing="0" |
|-
|-
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|-
|-
|}
|}
</small>


==Links==
==Links==
* [http://www.amplifier.cd/Test_Equipment/Tektronix/Tektronix_7000_series_special/7L5.html 7L5 page @ amplifier.cd] with internal photos
* [https://www.amplifier.cd/Test_Equipment/Tektronix/Tektronix_7000_series_special/7L5.html 7L5 page @ amplifier.cd] with internal photos
* [https://www.youtube.com/watch?v=tm4Y5Tv1huk 7L5 in operation @ youtube]
* [https://www.youtube.com/watch?v=tm4Y5Tv1huk 7L5 in operation @ youtube]
* [[L1-GC]]
{{Documents|Link=7L5}}
In [[Media:TekWeek (partial) October 10, 1975.pdf|TekWeek 10 Oct 1975]], [[Thor Hallen]] says
<blockquote>
''What is the Communications division doing to improve the reliability and field failure rates of high technology instruments such as the 7L5, 7L12 and 7L13 spectrumanalyzers?''
Glad you asked! High technology instruments such as the spectrum analyzers you mentioned pose enormous problems in maintaining Tektronix standards for high reliability.
Let’s consider the 7L5 for example. The 7L5 is the newest and most dense analyzer to date. It has approximately 2200 electrical parts packed into a two wide plug-in.
(The 7L12 and 7L13 are slightly less dense.) With such a high parts population, a 0.5%/year failure rate for individual parts would be disastrous.
In order to deliver better reliability, extraordinary steps are being implemented within the manufacturing area.
All benches have been covered with “pink poly” to make a static-free environment for the sensitive Metal Oxide Semiconductor (MOS) circuits of the 7L5.
Assemblers and technicians are being trained in static handling of these devices.
The most embarrassing reliability problem that can occur is when the customer has an instrument failure within the first few hours of operation.
To prevent this, the 7L5 goes through an extensive 7 day cycled burn-in. Each day the instrument is checked for electrical performance.
Any failures are repaired and the burn-in is continued until the instrument has completed the 7 days.
Any failures in the last two days will cause the burn-in to continue until the instrument displays two consecutive days without a failure.
Along with burn-in and special handling, extensive effort is given to analysis of field and plant failures for reliability problems.
In answer to your question, we have only discussed the 7L5, but the [[7L12]] and [[7L13]] receive similar treatment.
There is no final solution to improved reliability. As instruments increase in complexity and reliability, challenge increases proportionately.
</blockquote>
==Prices==
{| class="wikitable"
|-
! Year
! 1976
! 1980 
! 1988
|-
! Catalog price
| align="right" | $4,500
| align="right" | $7,075
| align="right" | $12,500
|-
! In 2023 Dollars
| align="right" | $24,300
| align="right" | $26,400
| align="right" | $32,400
|-
|}
According to an [[Media:Tek Schottky Diodes Memo rot.pdf|internal memo]], in 1979 annual sales were estimated at 454 units.


==Pictures==
==Pictures==
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7L5-opt25-cal.jpg | 7L5 Opt. 25
7L5-opt25-cal.jpg | 7L5 Opt. 25
7844-3.jpg | 7L5 in [[7844]]
7844-3.jpg | 7L5 in [[7844]]
7L5 no B-saveA.jpg | 7L5 Opt. 25 without B - (Save A)
Tek 7l5 in 7633.jpg
Tek 7l5 in 7633.jpg
Tek_7l5_front_panel.jpg|Front Panel of 7L5
Tek_7l5_front_panel_back.jpg|Back side of 7L5 front panel
Tek_7l5_complete_if_assembly_01.jpg|Complete IF Assembly of 7L5
Tek_7l5_complete_if_assembly_02.jpg|Complete IF Assembly of 7L5
Tek_7l5_RF_module_front.jpg|RF Module (Vertical Control Board and 1st LO assembly) of 7L5
Tek_7l5_sweep_front.jpg|Sweep board of 7L5
Tek_7l5_oscillator_ctrl_front.jpg|7L5 A and B oscillator control board front side
Tek_7l5_oscillator_ctrl_back.jpg|7L5 A and B oscillator control board back side
Tek_7l5_tune_reference_A_front.jpg|Front side of Tune Reference A board
Tek_7l5_tune_reference_A_back.jpg|Back side of Tune Reference A board
Tek_7l5_tune_reference_B_front.jpg|Front side of Tune Reference B board
Tek_7l5_tune_reference_B_back.jpg|Back side of Tune Reference B board
Tek_7l5_A_oscillator_front.jpg|Front side of A oscillator board
Tek_7L5_A_oscillator_back.jpg|Back side of A oscillator board
Tek_7l5_B_oscillator_front.jpg|Front side of B oscillator board
Tek_7l5_B_oscillator_back.jpg|Back side of B oscillator board
Tek_7l5_late_digital_storage_front.jpg|Later revision of 7L5 digital storage and average board - front side
Tek_7l5_late_digital_storage_back.jpg|Later revision of 7L5 digital storage and average board - back side
Tek_7l5_transverse_interface_01.jpg|Tektronix 7L5 Transverse Interface Board
Tek_7l5_transverse_interface_02.jpg|Tektronix 7L5 Transverse Interface Board
Tek_7l5_L3_plugin_top.jpg|Top view of L3 plugin assembly
Tek_7l5_L3_plugin_bottom.jpg|Bottom view of L3 plugin assembly
Tek_7l5_sweep_diagnostics.jpg|7L5 prepared for servicing the sweep and reference boards
</gallery>
</gallery>


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Tek option 25.1 tracking gen right.jpg
Tek option 25.1 tracking gen right.jpg
</gallery>
</gallery>
For internal pictures see the [[7L5/Repairs|repair section]].
==Components==
{{Parts|7L5}}






[[Category:7000 series combined plugins]]
[[Category:7000 series combined plugins]]
[[Category:Spectrum Analyzers]]
[[Category:7000 series spectrum analyzer plugins]]
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