7L5

The Tektronix 7L5 is a low frequency (10 Hz – 5 MHz) spectrum analyzer plug-in for 7000-series scopes. It has built-in digital storage so it will work fine in non-storage mainframes, such as the large-screen 7603. It also features digital scale and marker level/frequency (6 digits) readout, and a "max hold" function. According to the 070-2184-01 manual instruments with a serial number below Β070000 are missing the B - (Save A) feature and the corresponding button on the front panel. The military version is called PL-1391/U and is also lacking the B - (Save A) feature.

Key Specifications

Input frequency	10 Hz – 5 MHz
Drift	< 5 Hz / hour
Resolution bandwidth	10 Hz – 30 kHz in ×3 / ×10 steps
Sweep rate	10 s /Div to 0.1 ms/Div in 1-2-5 sequence plus Auto
Residual FM	< 40 Hzp-p (< 1 Hz from 50 Hz/Div to 2 kHz/Div)
Outputs	Horizontal, Video, Calibrator
Input impedance	L1 input module: 50 Ω L2 input module: 75 Ω L3 input module: 50 Ω, 600 Ω or 1 MΩ selectable (75 Ω, 600 Ω or 1 MΩ for the L3-1)

Options

No.	Log sweep display	Tracking generator	LED Readout
21	•
25		•
28			•
30	•	•
31	•		•
32		•	•
33	•	•	•

Links

• 7L5 page @ amplifier.cd with internal photos
• 7L5 in operation @ youtube

Pictures

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  7L5 Opt. 33 in 7633 mainframe

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  7L5 Opt. 32

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  7L5 Opt. 25

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  7L5 in 7844

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  7L5 Opt. 25 without B - (Save A)

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7L5 Opt.25 tracking generator plug-in

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For internal pictures see the repair section.