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{{Plugin Sidebar 2 |
{{Plugin Sidebar  
title=Tektronix 3L5 |
|manufacturer=Tektronix
summary=1 MHz Spectrum Analyzer |
|series=560-series scopes
image=Tek_3L5_LateSN.jpeg |
|type=3L5  
caption=Tektronix 3L5 Spectrum Analyzer |
|summary=50 Hz - 1 MHz Spectrum Analyzer Plug-In
series=[[560-series scopes]] |
|image=Tek 3L5 front2.jpeg  
introduced=1967 |
|caption=Tektronix 3L5 Spectrum Analyzer  
discontinued=(?) |
|introduced=1967
|discontinued=(?)
manuals=
manuals=
* [http://w140.com/3l5_by_matt.pdf Tektronix 3L5 Manual (PDF)]
* [[Media:070-0630-01.pdf|Tektronix 3L5 Manual]]
* [[Media:Tek 3l5 fcp aug 1967.pdf|Tektronix 3L5 Factory Calibration Procedure, August 1967 (PDF)]]
* [[Media:Tek 3l5 fcp aug 1967.pdf|Tektronix 3L5 Factory Calibration Procedure, August 1967]]
}}
}}
The '''Tektronix 3L5''' is a 50 Hz − 1 MHz spectrum analyzer plug-in for [[560-series scopes]]. It is very similar to the [[1L5]].


The '''Tektronix 3L5''' is a 50 Hz — 1 MHz spectrum analyzer plug-in for [[560-series scopes]].
In conjunction with the [[015-0107-00]] Swept Frequency Converter (tracking generator), the 3L5 can also be used to make scalar frequency response measurements.
 
It is very similar to the [[1L5]] and can be used to measure the spectrum of signals. 
{{BeginSpecs}}
In conjunction with the [[015-0107-00]] "Swept Frequency Generator" (tracking generator),  
{{Spec | Center Frequency    | 50 Hz to 990 kHz }}
the 3L5 can also be used to make scalar frequency response measurements.
{{Spec | Dispersion          | 10 Hz to 100 kHz }}
A video filter switch was added to the later SNs (1971 Catalog). 3L5 is based on the swept-frontend design, where the first local Oscillator is swept for the spectrum scan.
{{Spec | Input Impedance    | 1 MΩ // 30 pF }}
It is a full semiconductor design except for the final output amplifier, which uses a [[8416]] vacuum tube.  
{{Spec | Input Voltage      | Max. 300 V (DC + peak AC) }}
{{Spec | Vertical Resolution | Video: 100 mV/div to 100 V/div, LIN: 1 mV to 2 V<sub>RMS</sub> }}
{{Spec | Internal Cal Signal | 5 kHz ±1% }}
{{Spec | First LO Out        | ≥1 MHz (Sweep), ≥1 V<sub>p-p</sub> into ≥1 kΩ }}
{{Spec | Recorder Out        | 5 mV to 15 mV into 600 Ω }}
{{Spec | Weight              | 2.7 kg / 6 lbs }}
{{EndSpecs}}
 
A video filter switch was added to the later SNs (1971 Catalog).  
 
==Internals==
The 3L5 is a full semiconductor design except for the final output amplifier, which uses a [[8416]] vacuum tube.  The circuit is based on the swept-frontend design, i.e. the first local oscillator is swept for the spectrum scan.  


=== 75 Ω Version ===
=== 75 Ω Version ===
There is also a 75 Ω version of the 3L5.  Its input is on the rear, via a coaxial connector.
There is also a 75 Ω version of the 3L5.  Its input is on the rear, via a coaxial connector.
A lever on the front panel switches between two frequency ranges:
A lever on the front panel switches between two frequency ranges:
* 10 kHz - 1 MHz
* 10 kHz − 1 MHz
* 18.010 MHz - 19 MHz
* 18.010 MHz − 19 MHz


===Timebase Support===
===Timebase Support===
3L5 requires a timebase plug-in in the horizontal compartment to operate.  
The 3L5 requires a timebase plug-in in the horizontal compartment to operate.  
Timebase plug-in units with serial no listed and below require modification 040-0413-00 to provide the sweep signal to the 3L5 (To pin 18 of the [[560_Series_plug-in_interface|plug-in connector]]).
 
Timebase plug-in units with serial numbers listed below require modification [[040-0413-00]] to provide the sweep signal to the 3L5 (To pin 18 of the [[560_Series_plug-in_interface|plug-in connector]]).


{| class="wikitable"
{| class="wikitable"
Line 35: Line 49:
! SN#  
! SN#  
|-
|-
| [[2B67]] ||15180
| [[2B67]] || <15180
|-
|-
| [[3B1]]  ||4040
| [[3B1]]  || <4040
|-
|-
| [[3B3]]  ||4270
| [[3B3]]  || <4270
|-
|-
| [[3B4]]  ||740
| [[3B4]]  || <740
|}
|}
{{BeginSpecs}}
{{Spec | Center Frequency Range | 50 Hz to 990 kHz}}
{{Spec | Dispersion Range | 10 Hz to 100 kHz}}}
{{Spec | Input Impedance | ≈ 1 MΩ  // 30 pF }}
{{Spec | Input Voltage | Max. 300 V (DC + peak AC) }}
{{Spec | Vertical Resolution | Video - .1 v/div to 100 v/div, LIN - .001 V to 2V RMS}}
{{Spec | Internal Cal Signal  | 5 kHz ±1%}}
{{Spec | First LO Out | ≥1 MHz (Sweep), ≥1 V<sub>p-p</sub> into ≥1 kΩ}}
{{Spec | Recorder Out | 5 mV to 15 mV into 600Ω}}
{{Spec | Weight | ≈6 pounds }}
{{EndSpecs}}


==Pictures==
==Pictures==
'''1 MΩ version'''
'''1 MΩ version'''
<gallery>
<gallery>
Tek 3L5 front2.jpeg | Front
Tek 3L5 left2.jpeg  | Left
Tek 3L5 right2.jpeg | Right
Image:Tek 3l5 front.jpg | 1 MΩ Version  
Image:Tek 3l5 front.jpg | 1 MΩ Version  
Tek_3L5_LateSN.jpeg | 1 MΩ later version with Video Filter Switch
Tek_3L5_LateSN.jpeg | 1 MΩ Later Version with Video Filter Switch
3L5_LHS.jpeg | LHS
3L5_LHS.jpeg | LHS
3L5_RHS.jpeg | RHS
3L5_RHS.jpeg | RHS
3L5_Top.jpeg | Top
3L5_Top.jpeg | Top
3L5_Bottom.jpeg | Bottom
3L5_Bottom.jpeg | Bottom
3L5_Filter-Chassis_1.jpeg|Internals - 3MHz Filter, 2nd LO(3.1MHz) and 2nd mixer.  
3L5_Filter-Chassis_1.jpeg|Internals - 3 MHz Filter, 2nd LO (3.1 MHz) and 2nd Mixer.  
3L5_Filter-Chassis_2.jpeg|Internals - 3MHz Filter, 2nd LO(3.1MHz) and 2nd mixer.  
3L5_Filter-Chassis_2.jpeg|Internals - 3 MHz Filter, 2nd LO (3.1 MHz) and 2nd Mixer.  
158-0022-00_1.jpeg | Internals - 100 kHz Crystal from Variable Resolution Amp [[158-0022-00]]
158-0022-00_2.jpeg | Internals - 100 kHz crystal from Variable Resolution Amp [[158-0022-00]]
</gallery>


</gallery>
'''75 Ω version'''
'''75 Ω version'''
<gallery>
<gallery>
3l5 18mhz fr2.JPG|75 Ω version of 3L5, front
3l5 18mhz fr2.JPG   | 75 Ω Version of 3L5, Front
Tek 3l5 75ohm 1.jpg|75 Ω version, front/top
Tek 3l5 75ohm 1.jpg | 75 Ω Version, Front/Top
Tek 3l5 75ohm 4.jpg|75 Ω version, left
Tek 3l5 75ohm 4.jpg | 75 Ω Version, Left
Tek 3l5 75ohm 5.jpg|75 Ω version, top
Tek 3l5 75ohm 5.jpg | 75 Ω Version, Top
Tek 3l5 75ohm 6.jpg|75 Ω version, bottom left
Tek 3l5 75ohm 6.jpg | 75 Ω Version, Bottom/Left
3l5 18mhz l.JPG|75 Ω version
3l5 18mhz l.JPG     | 75 Ω Version
3l5 18mhz l2.JPG|75 Ω version
3l5 18mhz l2.JPG   | 75 Ω Version
3l5 18mhz rr2.JPG|75 Ω version, back
3l5 18mhz rr2.JPG   | 75 Ω Version, Back
</gallery>
</gallery>


==Components==
{{Parts|3L5}}


[[Category:Spectrum analyzers]]
[[Category:Spectrum analyzers]]
[[Category:560 series plugins]]
[[Category:560 series plugins]]
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