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The Tektronix 1L5 is a low-frequency spectrum analyzer for [[500-series scopes]].
{{Plugin Sidebar
|manufacturer=Tektronix
|series=500-series scopes
|type=1L5
|summary=1 MHz Spectrum Analyzer
|image=Tek 1L5 front4.jpeg
|caption=Tektronix 1L5
|introduced=1967
|discontinued=1975
|manuals=
* [[Media:070-0600-01.pdf|Tektronix 1L5 Manual]]
* [[Media:Tek 1l5 fcp sep 1967.pdf‎|Tektronix 1L5 Factory Calibration Procedure, September 1967]]
}}
The '''Tektronix 1L5''' is a low-frequency spectrum analyzer for [[500-series scopes]].
It is very similar to the [[3L5]].


Its center frequency is set on a trio of rotary switches and can range from 50Hz to
Its center frequency is set on a trio of rotary switches and can range from 50 Hz to 990 kHz.  Minimum resolution bandwidth is 10 Hz.  It has a 1 MΩ input resistance.
990kHz.  Minimum resolution bandwidth is 10Hz.  It has a 1 meg input resistance.


Type 1L5 was sold from 1967 or 1968 until the end of the classic plugin scope
Type 1L5 was [[introduced in 1967|sold from 1967]] until the end of the classic plug-in scope line.   
line after 1974.  Not particularly well calibrated in either frequency, bandwidth,
Not particularly accurate in either frequency, bandwidth, or amplitude, it was no match for HP's 141T/8556A/8552B combination in performance, but it was a small fraction of the price.
or amplitude, it was no match for HP's 141T/8556A/8552B combination as performance
was concerned, but it was a small fraction of the price.


Although Type 1L5 can operate in any classic plugin scope*, it is by far the
Although Type 1L5 can operate in any 500-series scope*, it is most useful by far in the Type [[549]] storage mainframe which allows slow sweeps needed to match the narrower resolution bandwidths.
most useful in the Type [[549]] storage mainframe, where it's possible to
sweep slowly and take advantage of the narrower resolution bandwidths.


<nowiki>*</nowiki> 531/535/541/545 need a wiring mod to alleviate a
In conjunction with the [[015-0107-00]] Swept Frequency Converter (tracking generator), the 1L5 can also measure frequency response. 
vertical amp instability.
 
<nowiki>*</nowiki> [[531]]/[[535]]/[[541]]/[[545]] need a wiring mod to alleviate vertical amp instability.
{{MissingSpecs}}
 
==Links==
{{Documents|Link=1L5}}
 
==Pictures==
'''External'''
<gallery>
Tek 1L5 front2.jpeg ‎| Front panel
Tek 1l5 front.JPG
Tek 1l5 2409.jpg
Tek 1l5 1.jpg
Tek 1l5 2.jpg
Tek 1l5 3.jpg
Tek 1l5 4.jpg
Tek 1l5 5.jpg
Tek 1l5 rear.JPG | Rear
Tek 1L5 rear2.jpeg ‎
</gallery>
 
'''Internal'''
<gallery>
Tek 1L5 bottom2.jpeg ‎
Tek 1L5 left2.jpeg ‎
Tek 1L5 right2.jpeg ‎
Tek 1L5 top2.jpeg
Tek 1l5 top2.JPG|top
Tek 1l5 right.JPG|right
Tek 1l5 left.JPG|left
Tek 1l5 bottom.JPG|bottom
</gallery>
 
'''Pre-production unit'''
<gallery>
Preproduction incomplete 1L5.jpg|Preproduction 1L5 (serial A01)
Preproduction incomplete 1L5 left.jpg|Preproduction 1L5 (serial A01)
Preproduction incomplete 1L5 right.jpg|Preproduction 1L5 (serial A01)
</gallery>
 
'''Measurements, Diagrams'''
<gallery>
549_1L5.JPG | 1L5 works fine in [[549]]
Tek 1L5 3MHz filter response 10db div.jpg|Measured frequency response of 3 MHz filter from P90 to P280 with Q290 removed to disable 3.1 MHz oscillator, but powered up. 10 dB/div.
Tek 1L5 3MHz filter response 1db div.jpg|Measured frequency response of 3 MHz filter. 1 dB/div.
Tek 1l5 block diagram.png|Block Diagram
Tek 1l5 attenuators and input.png|Attenuators and Input
Tek 1l5 center freq switching.png|Center Frequency Switching
Tek 1l5 swept freq gen.png|Swept Frequency Generator
Tek 1l5 var res amp.png|Variable Resolution Amplifier
Tek 1l5 dispersion warning.png|Dispersion Warning Light
Tek 1l5 output amp.png|Output Amplifier
Tek 1l5 calibrator.png|Calibrator
Tek 1l5 plug and power.png|Interconnecting Plug and Power Distribution
</gallery>
 
==Components==
{{Parts|1L5}}
 
 
[[Category:500 series spectrum analyzer plugins]]

Latest revision as of 01:37, 15 March 2024

Tektronix 1L5
1 MHz Spectrum Analyzer
Tektronix 1L5

Compatible with 500-series scopes

Produced from 1967 to 1975

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

The Tektronix 1L5 is a low-frequency spectrum analyzer for 500-series scopes. It is very similar to the 3L5.

Its center frequency is set on a trio of rotary switches and can range from 50 Hz to 990 kHz. Minimum resolution bandwidth is 10 Hz. It has a 1 MΩ input resistance.

Type 1L5 was sold from 1967 until the end of the classic plug-in scope line. Not particularly accurate in either frequency, bandwidth, or amplitude, it was no match for HP's 141T/8556A/8552B combination in performance, but it was a small fraction of the price.

Although Type 1L5 can operate in any 500-series scope*, it is most useful by far in the Type 549 storage mainframe which allows slow sweeps needed to match the narrower resolution bandwidths.

In conjunction with the 015-0107-00 Swept Frequency Converter (tracking generator), the 1L5 can also measure frequency response.

* 531/535/541/545 need a wiring mod to alleviate vertical amp instability.

Key Specifications

  • please add

Links

Documents Referencing 1L5

(no results)

Pictures

External

  • Front panel

    Front panel

  • Rear

    Rear

Internal

  • top

    top

  • right

    right

  • left

    left

  • bottom

    bottom

Pre-production unit

  • Preproduction 1L5 (serial A01)

    Preproduction 1L5 (serial A01)

  • Preproduction 1L5 (serial A01)

    Preproduction 1L5 (serial A01)

  • Preproduction 1L5 (serial A01)

    Preproduction 1L5 (serial A01)

Measurements, Diagrams

  • 1L5 works fine in 549

    1L5 works fine in 549

  • Measured frequency response of 3 MHz filter from P90 to P280 with Q290 removed to disable 3.1 MHz oscillator, but powered up. 10 dB/div.

    Measured frequency response of 3 MHz filter from P90 to P280 with Q290 removed to disable 3.1 MHz oscillator, but powered up. 10 dB/div.

  • Measured frequency response of 3 MHz filter. 1 dB/div.

    Measured frequency response of 3 MHz filter. 1 dB/div.

  • Block Diagram

    Block Diagram

  • Attenuators and Input

    Attenuators and Input

  • Center Frequency Switching

    Center Frequency Switching

  • Swept Frequency Generator

    Swept Frequency Generator

  • Variable Resolution Amplifier

    Variable Resolution Amplifier

  • Dispersion Warning Light

    Dispersion Warning Light

  • Output Amplifier

    Output Amplifier

  • Calibrator

    Calibrator

  • Interconnecting Plug and Power Distribution

    Interconnecting Plug and Power Distribution

Components

Some Parts Used in the 1L5

Part Part Number(s) Class Description Used in
1N3182 152-0269-00 Discrete component varactor diode 3L5 • 1L5 • 3T7 • 492 • 465M • 7844 • 2465
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