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/h |
| 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 | |
| Log Sweep Option | 250 Hz to 222.25 kHz by digitally combining three decade sweeps (250 Hz—2.25 kHz, 2.25 kHz—22.25 kHz, 22.25 kHz—222.25 kHz), 2.5 s sweep time |
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
- L1-GC
Application Notes Referencing 7L5
| Document | Title | Authors | Year | Links |
|---|---|---|---|---|
| AX-3535.pdf | Crystal Device Measurements Using the Spectrum Analyzer | Morris Engelson | 1977 | 7L5 • 7L13 • TR502 |
| AX-3406-1.pdf | EMI Applications Using the Spectrum Analyzer | Morris Engelson | 1979 | 7L5 • L1 |
Prices
| Year | 1976 | 1980 | 1988 |
|---|---|---|---|
| Catalog price | $4,500 | $7,075 | $12,500 |
| In 2023 Dollars | $24,300 | $26,400 | $32,400 |
According to an internal memo, in 1979 annual sales were estimated at 454 units.
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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Front Panel of 7L5
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Back side of 7L5 front panel
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Complete IF Assembly of 7L5
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Complete IF Assembly of 7L5
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RF Module (Vertical Control Board and 1st LO assembly) of 7L5
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Sweep board of 7L5
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7L5 A and B oscillator control board front side
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7L5 A and B oscillator control board back side
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Front side of Tune Reference A board
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Back side of Tune Reference A board
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Front side of Tune Reference B board
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Back side of Tune Reference B board
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Front side of A oscillator board
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Back side of A oscillator board
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Front side of B oscillator board
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Back side of B oscillator board
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Later revision of 7L5 digital storage and average board - front side
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Later revision of 7L5 digital storage and average board - back side
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Tektronix 7L5 Transverse Interface Board
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Tektronix 7L5 Transverse Interface Board
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Top view of L3 plugin assembly
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Bottom view of L3 plugin assembly
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7L5 prepared for servicing the sweep and reference boards
7L5 Opt.25 tracking generator plug-in
For internal pictures see the repair section.
Components
Some Parts Used in the 7L5
| Part | Part Number(s) | Class | Description | Used in |
|---|---|---|---|---|
| 151-0261-00 | 151-0261-00 | Discrete component | dual PNP transistor | AM501 • AM502 • CG5001 • CG551AP • FG501 • FG502 • FG503 • OF150 • OF151 • OF152 • OF235 • OS261 • RM502A • R1140 • R5030 • R5031 • R7912 • 067-0679-00 • 067-0807-00 • 1101 • 1140A • 1141 • 1142 • 1350 • 145 • 1450 • 1480 • 1481 • 1482 • 1485 • 1501 • 1801 • 1900 • 1910 • 1980 • 213 • 26A1 • 26A2 • 2620 • 285 • 3A9 • 3A10 • 3S1 • 3S2 • 3S5 • 3S6 • 432 • 434 • 4501 • 454 • 4601 • 4602 • 4610 • 4612 • 4620 • 4632 • 4634 • 4701 • 475 • 492 • 492A • 492AP • 494 • 494P • 496 • 496P • 5A13N • 5A20N • 5A21N • 5A22N • 5A26 • 5L4N • 502A • 5030 • 5031 • 576 • 690SR • 7A22 • 7A29 • 7B51 • 7B71 • 7J20 • 7L5 • 7S11 • 7S12 • 7912AD |
| 155-0014-01 | 155-0014-00 • 155-0014-01 | Monolithic integrated circuit | analog-to-decimal converter | 7000 series readout system • 7854 • 7934 • 7J20 • 7L5 • P7001 |
| 155-0035-00 | 155-0035-00 • 155-0116-00 | Monolithic integrated circuit | quad op-amp | 3110 • 3S7 • 3T7 • 492 • 492A • 492AP • 492P • 494 • 494P • 496 • 496P • 4010 • 4011 • 4012 • 4013 • 7L5 • 7L12 • 7L13 • 7L14 • 7L18 • 7S11 • 7T11 • 7S12 • S-6 • 1461 • 4602 • P7001 • 613 • 653 |
| 155-0056-00 | 155-0056-00 • 155-0056-01 | Monolithic integrated circuit | sweep control | 26G1 • 26G2 • 26G3 • 314 • 4701 • 5B10N • 5B12N • 5S14N • 7L5 • 7L12 • 7L13 • 7L14 • 7L18 • 7S14 • RG501 • Telequipment D63 • Telequipment DM63 |
| 155-0108-00 | 155-0108-00 | Hybrid integrated circuit | non-linear shaper | 7L5 |
| 155-0110-00 | 155-0110-00 | Monolithic integrated circuit | custom legend generator | 7L5 |
| 155-0117-00 | 155-0117-00 | Monolithic integrated circuit | readout control | 7L5 |
| 155-0118-00 | 155-0118-00 | Monolithic integrated circuit | vertical control | 7L5 |
| 155-0157-00 | 155-0157-00 | Monolithic integrated circuit | digital storage vertical control | 7L5 • 7L14 • 7L18 • 491 • 492 • 492A • 492BP • 492PGM • 494 • 494A • 495 • 496 • 497P |
| 155-0158-00 | 155-0158-00 | Monolithic integrated circuit | digital storage horizontal control | 7L5 • 7L14 • 7L18 • 491 • 492 • 492A • 492BP • 492PGM • 494 • 494A • 495 • 496 • 497P |
| 155-0198-00 | 155-0198-00 | Monolithic integrated circuit | readout control | 7L5 |
| 155-0199-00 | 155-0199-00 | Monolithic integrated circuit | vertical control | 7L5 |
| VTL2C4 | 307-0476-00 | Discrete component | LED-LDR optocoupler | 7L5 |