Tektronix 7L5 Spectrum Analyzer Plug-In Module 0-5MHz Digital Storage 7000

Tektronix 7L5 Spectrum Analyzer Plug-In Module 0-5MHz Digital Storage 7000

The Tektronix 7L5 is a spectrum analyzer plug-in module designed for use with the Tektronix 7000-series oscilloscope mainframes. It provides low-frequency RF spectrum analysis from 0 to 5 MHz, with an integrated digital storage display for capturing and examining spectral data. As a plug-in instrument, the 7L5 slots into any compatible 7000-series mainframe — such as the 7603, 7704, 7904, or 7834 — and uses the mainframe's display, timebase, and power resources.

Specifications & What's Included

• Manufacturer: Tektronix
• Model: 7L5
• Type: Spectrum Analyzer Plug-In Module
• Frequency Range: 0 to 5 MHz (Dot Frequency)
• Display Mode: Digital Storage (Storage Off / 9-Digit PL modes visible on panel)
• Front Panel Controls: Dot Marker frequency, Fine Tuning, Reference Level, Log/Source Mode, Triggering (Freq Rob, Burn, Level/Slope modes)
• Resolution: Frequency Span/Div and Time/Div controls
• Inputs: Two BNC input connectors (AMPL / 75 MHz REF labeled on panel)
• Form Factor: Tektronix 7000-series plug-in module
• Compatible Mainframes: Tektronix 7603, 7704, 7904, 7834, and other 7000-series mainframes
• Manufacture: Tektronix, Beaverton, Oregon, USA
• Included: Plug-in module only — no mainframe, cables, or accessories

Applications

The Tektronix 7000-series plug-in system was one of the most flexible and widely used modular test platforms of the 1970s and 1980s. Engineers and technicians configured a single mainframe with interchangeable plug-ins — spectrum analyzers, sampling units, logic analyzers, and more — making the system highly versatile for electronics labs, R&D environments, and production test benches. The 7L5 specifically covers the audio and low-RF spectrum (DC to 5 MHz), making it suited for characterizing amplifier frequency response, analyzing power supply ripple and noise, evaluating audio electronics, and examining low-frequency RF signals. The digital storage capability allowed users to capture transient or intermittent spectral events for later review — a notable feature for its era. Today, 7000-series plug-ins remain sought after by vintage test equipment collectors, electronics educators, and engineers maintaining legacy instrumentation. A compatible 7000-series mainframe is required to operate this module.