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The Tektronix 3L5 is a spectrum analyzer plug-in for [[560-series scopes]].
{{Plugin Sidebar
It is very similar to the [[1L5]].
|manufacturer=Tektronix
It can be used to measure the spectrum of signals or it can be used with the
|series=560-series scopes
[[015-0107-00]] to measure frequency response. 
|type=3L5
|summary=50 Hz - 1 MHz Spectrum Analyzer Plug-In
|image=Tek 3L5 front2.jpeg
|caption=Tektronix 3L5 Spectrum Analyzer
|introduced=1967
|discontinued=(?)
manuals=
* [[Media:070-0630-01.pdf|Tektronix 3L5 Manual]]
* [[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]].


* [http://w140.com/3l5_by_matt.pdf Tektronix 3L5 Manual (PDF)]
In conjunction with the [[015-0107-00]] Swept Frequency Converter (tracking generator), the 3L5 can also be used to make scalar frequency response measurements.


{{BeginSpecs}}
{{Spec | Center Frequency    | 50 Hz to 990 kHz }}
{{Spec | Dispersion          | 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: 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 ===
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:
* 10 kHz − 1 MHz
* 18.010 MHz − 19 MHz
===Timebase Support===
The 3L5 requires a timebase plug-in in the horizontal compartment to operate.
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"
|-
! Time Base
! SN#
|-
| [[2B67]] || <15180
|-
| [[3B1]]  || <4040
|-
| [[3B3]]  || <4270
|-
| [[3B4]]  || <740
|}
==Pictures==
'''1 MΩ version'''
<gallery>
Tek 3L5 front2.jpeg | Front
Tek 3L5 left2.jpeg  | Left
Tek 3L5 right2.jpeg | Right
Image:Tek 3l5 front.jpg | 1 MΩ Version
Tek_3L5_LateSN.jpeg | 1 MΩ Later Version with Video Filter Switch
3L5_LHS.jpeg | LHS
3L5_RHS.jpeg | RHS
3L5_Top.jpeg | Top
3L5_Bottom.jpeg | Bottom
3L5_Filter-Chassis_1.jpeg|Internals - 3 MHz Filter, 2nd LO (3.1 MHz) 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>
'''75 Ω version'''
<gallery>
<gallery>
Image:Tek 3l5 front.jpg
3l5 18mhz fr2.JPG  | 75 Ω Version of 3L5, Front
Tek 3l5 75ohm 1.jpg | 75 Ω Version, Front/Top
Tek 3l5 75ohm 4.jpg | 75 Ω Version, Left
Tek 3l5 75ohm 5.jpg | 75 Ω Version, Top
Tek 3l5 75ohm 6.jpg | 75 Ω Version, Bottom/Left
3l5 18mhz l.JPG    | 75 Ω Version
3l5 18mhz l2.JPG    | 75 Ω Version
3l5 18mhz rr2.JPG  | 75 Ω Version, Back
</gallery>
</gallery>
==Components==
{{Parts|3L5}}
[[Category:Spectrum analyzers]]
[[Category:560 series plugins]]

Latest revision as of 00:57, 19 November 2023

Tektronix 3L5
50 Hz - 1 MHz Spectrum Analyzer Plug-In
Tektronix 3L5 Spectrum Analyzer

Compatible with 560-series scopes

Produced from 1967 to (?) manuals=

Manuals

{{{manuals}}}

(All manuals in PDF format unless noted otherwise)
Manuals – Specifications – Links – Pictures

The Tektronix 3L5 is a 50 Hz − 1 MHz spectrum analyzer plug-in for 560-series scopes. It is very similar to the 1L5.

In conjunction with the 015-0107-00 Swept Frequency Converter (tracking generator), the 3L5 can also be used to make scalar frequency response measurements.

Key Specifications

Center Frequency 50 Hz to 990 kHz
Dispersion 10 Hz to 100 kHz
Input Impedance 1 MΩ // 30 pF
Input Voltage Max. 300 V (DC + peak AC)
Vertical Resolution Video: 100 mV/div to 100 V/div, LIN: 1 mV to 2 VRMS
Internal Cal Signal 5 kHz ±1%
First LO Out ≥1 MHz (Sweep), ≥1 Vp-p into ≥1 kΩ
Recorder Out 5 mV to 15 mV into 600 Ω
Weight 2.7 kg / 6 lbs

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

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:

  • 10 kHz − 1 MHz
  • 18.010 MHz − 19 MHz

Timebase Support

The 3L5 requires a timebase plug-in in the horizontal compartment to operate.

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 plug-in connector).

Time Base SN#
2B67 <15180
3B1 <4040
3B3 <4270
3B4 <740

Pictures

1 MΩ version

  • Front

    Front

  • Left

    Left

  • Right

    Right

  • 1 MΩ Version

    1 MΩ Version

  • 1 MΩ Later Version with Video Filter Switch

    1 MΩ Later Version with Video Filter Switch

  • LHS

    LHS

  • RHS

    RHS

  • Top

    Top

  • Bottom

    Bottom

  • Internals - 3 MHz Filter, 2nd LO (3.1 MHz) and 2nd Mixer.

    Internals - 3 MHz Filter, 2nd LO (3.1 MHz) and 2nd Mixer.

  • Internals - 3 MHz Filter, 2nd LO (3.1 MHz) and 2nd Mixer.

    Internals - 3 MHz Filter, 2nd LO (3.1 MHz) and 2nd Mixer.

  • Internals - 100 kHz Crystal from Variable Resolution Amp 158-0022-00

    Internals - 100 kHz Crystal from Variable Resolution Amp 158-0022-00

  • Internals - 100 kHz crystal from Variable Resolution Amp 158-0022-00

    Internals - 100 kHz crystal from Variable Resolution Amp 158-0022-00

75 Ω version

  • 75 Ω Version of 3L5, Front

    75 Ω Version of 3L5, Front

  • 75 Ω Version, Front/Top

    75 Ω Version, Front/Top

  • 75 Ω Version, Left

    75 Ω Version, Left

  • 75 Ω Version, Top

    75 Ω Version, Top

  • 75 Ω Version, Bottom/Left

    75 Ω Version, Bottom/Left

  • 75 Ω Version

    75 Ω Version

  • 75 Ω Version

    75 Ω Version

  • 75 Ω Version, Back

    75 Ω Version, Back

Components

Some Parts Used in the 3L5

Part Part Number(s) Class Description Used in
1N3182 152-0269-00 Discrete component varactor diode 3L5 • 1L5 • 3T7 • 492 • 465M • 7844 • 2465
8416 154-0413-00 • 157-0116-00 Vacuum Tube (Dual Triode) dual triode 1S1 • 2A61 • 3A8 • 3L5 • W
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