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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.


Frequency range 10 Hz to 100 kHz
Dynamic range 80 dB




$1,950 (1975)