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Tektronix 5L4N
100 kHz Spectrum Analyzer plugin
Tek 5L4N

Compatible with 5000-series scopes

Produced from 1975 to 1983

Manuals – Specifications – Links – Pictures

The Tektronix 5L4N is a 100 kHz LF spectrum analyzer plug-in for 5000-series scopes. It features a built-in tracking generator.

As is typical for non-FFT low frequency analyzers, high spectral resolution at low frequencies implies slow sweep speeds (as slow as 10 s/Div in this unit) which require a storage mainframe or recorder to view properly.

It was made from 1975 to 1983.

Key Specifications

Frequency range 10 Hz to 100 kHz
Dynamic range 80 dB

please expand


Documents Referencing 5L4N

Document Class Title Authors Year Links
Tekscope 1975 V7 N3.pdf Article A Potpourri of Modifications and Service Hints 1975
Tekscope 1977 V9 N2.pdf Article Measuring Harmonic Distortion with a Spectrum Analyzer Ken Matheson 1977
AX-3107.pdf Application Note The Tektronix Cookbook of Standard Audio Tests using the 5L4N Low Frequency Spectrum Analyzer Clifford B. Schrock 1979
26AX-3582-3.pdf Application Note FM Broadcast Measurements Using the Spectrum Analyzer Clifford B. Schrock 1981


  • $1,950 in 1975 ($11,100 in 2023 dollars)



Some Parts Used in the 5L4N

Part Part Number(s) Class Description Used in
155-0048-01 155-0048-00 155-0048-01 155-0055-00 155-0055-01 Monolithic integrated circuit trigger sweep 211 212 213 214 432 433 5B12N 5B13N 5L4N 603 604 605 606 607 624 SC501 R7912