3L5: Difference between revisions
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manufacturer=Tektronix |series=560-series scopes |type= 3L5 | | manufacturer=Tektronix |series=560-series scopes |type= 3L5 | | ||
summary=1 MHz Spectrum Analyzer | | summary=1 MHz Spectrum Analyzer | | ||
image= | image=Tek 3L5 front2.jpeg | | ||
caption=Tektronix 3L5 Spectrum Analyzer | | caption=Tektronix 3L5 Spectrum Analyzer | | ||
designers= | | designers= | | ||
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'''1 MΩ version''' | '''1 MΩ version''' | ||
<gallery> | <gallery> | ||
Tek 3L5 front2.jpeg | |||
Tek 3L5 left2.jpeg | |||
Tek 3L5 right2.jpeg | |||
Image:Tek 3l5 front.jpg | 1 MΩ Version | Image:Tek 3l5 front.jpg | 1 MΩ Version | ||
Tek_3L5_LateSN.jpeg | 1 MΩ later version with Video Filter Switch | Tek_3L5_LateSN.jpeg | 1 MΩ later version with Video Filter Switch | ||
Revision as of 16:06, 15 July 2023
The Tektronix 3L5 is a 50 Hz — 1 MHz spectrum analyzer plug-in for 560-series scopes.
It is very similar to the 1L5 and can be used to measure the spectrum of signals.
In conjunction with the 015-0107-00 Swept Frequency Converter (tracking generator), the 3L5 can also be used to make scalar frequency response measurements.
A video filter switch was added to the later SNs (1971 Catalog). The 3L5 is based on the swept-frontend design, where the first local Oscillator is swept for the spectrum scan. It is a full semiconductor design except for the final output amplifier, which uses a 8416 vacuum tube.
75 Ω Version
There is also a 75 Ω version of the 3L5. Its input is on the rear, via a coaxial connector. A lever on the front panel switches between two frequency ranges:
- 10 kHz - 1 MHz
- 18.010 MHz - 19 MHz
Timebase Support
3L5 requires a timebase plug-in in the horizontal compartment to operate. Timebase plug-in units with serial no listed and below require modification 040-0413-00 to provide the sweep signal to the 3L5 (To pin 18 of the plug-in connector).
| Time Base | SN# |
|---|---|
| 2B67 | 15180 |
| 3B1 | 4040 |
| 3B3 | 4270 |
| 3B4 | 740 |
Key Specifications
| Center Frequency Range | 50 Hz to 990 kHz |
|---|---|
| Dispersion Range | 10 Hz to 100 kHz |
| Input Impedance | ≈ 1 MΩ // 30 pF |
| Input Voltage | Max. 300 V (DC + peak AC) |
| Vertical Resolution | Video - .1 v/div to 100 v/div, LIN - .001 V to 2V RMS |
| Internal Cal Signal | 5 kHz ±1% |
| First LO Out | ≥1 MHz (Sweep), ≥1 Vp-p into ≥1 kΩ |
| Recorder Out | 5 mV to 15 mV into 600Ω |
| Weight | ≈6 pounds |
Pictures
1 MΩ version
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1 MΩ Version
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1 MΩ later version with Video Filter Switch
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LHS
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RHS
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Top
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Bottom
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Internals - 3MHz Filter, 2nd LO(3.1MHz) and 2nd mixer.
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Internals - 3MHz Filter, 2nd LO(3.1MHz) and 2nd mixer.
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Internals - 100 kHz crystal from variable res amp 158-0022-00
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Internals - 100 kHz crystal from variable res amp 158-0022-00
75 Ω version
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75 Ω version of 3L5, front
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75 Ω version, front/top
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75 Ω version, left
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75 Ω version, top
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75 Ω version, bottom left
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75 Ω version
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75 Ω version
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75 Ω version, back
