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3L5: Difference between revisions
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The Tektronix 3L5 is a spectrum analyzer plug-in for [[560-series scopes]]. | {{Plugin Sidebar | ||
It | |manufacturer=Tektronix | ||
[[ | |series=560-series scopes | ||
|type=3L5 | |||
|summary=50 Hz - 1 MHz Spectrum Analyzer Plug-In | |||
|image=Tek 3L5 front2.jpeg | |||
|caption=Tektronix 3L5 Spectrum Analyzer | |||
|introduced=1967 | |||
|discontinued=(?) | |||
manuals= | |||
* [[Media:070-0630-01.pdf|Tektronix 3L5 Manual]] | |||
* [[Media:Tek 3l5 fcp aug 1967.pdf|Tektronix 3L5 Factory Calibration Procedure, August 1967]] | |||
}} | |||
The '''Tektronix 3L5''' is a 50 Hz − 1 MHz spectrum analyzer plug-in for [[560-series scopes]]. It is very similar to the [[1L5]]. | |||
In conjunction with the [[015-0107-00]] Swept Frequency Converter (tracking generator), the 3L5 can also be used to make scalar frequency response measurements. | |||
{{BeginSpecs}} | |||
{{Spec | Center Frequency | 50 Hz to 990 kHz }} | |||
{{Spec | Dispersion | 10 Hz to 100 kHz }} | |||
{{Spec | Input Impedance | 1 MΩ // 30 pF }} | |||
{{Spec | Input Voltage | Max. 300 V (DC + peak AC) }} | |||
{{Spec | Vertical Resolution | Video: 100 mV/div to 100 V/div, LIN: 1 mV to 2 V<sub>RMS</sub> }} | |||
{{Spec | Internal Cal Signal | 5 kHz ±1% }} | |||
{{Spec | First LO Out | ≥1 MHz (Sweep), ≥1 V<sub>p-p</sub> into ≥1 kΩ }} | |||
{{Spec | Recorder Out | 5 mV to 15 mV into 600 Ω }} | |||
{{Spec | Weight | 2.7 kg / 6 lbs }} | |||
{{EndSpecs}} | |||
A video filter switch was added to the later SNs (1971 Catalog). | |||
==Internals== | |||
The 3L5 is a full semiconductor design except for the final output amplifier, which uses a [[8416]] vacuum tube. The circuit is based on the swept-frontend design, i.e. the first local oscillator is swept for the spectrum scan. | |||
=== 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=== | |||
The 3L5 requires a timebase plug-in in the horizontal compartment to operate. | |||
Timebase plug-in units with serial numbers listed below require modification [[040-0413-00]] to provide the sweep signal to the 3L5 (To pin 18 of the [[560_Series_plug-in_interface|plug-in connector]]). | |||
{| class="wikitable" | |||
|- | |||
! Time Base | |||
! SN# | |||
|- | |||
| [[2B67]] || <15180 | |||
|- | |||
| [[3B1]] || <4040 | |||
|- | |||
| [[3B3]] || <4270 | |||
|- | |||
| [[3B4]] || <740 | |||
|} | |||
==Pictures== | |||
'''1 MΩ version''' | |||
<gallery> | |||
Tek 3L5 front2.jpeg | Front | |||
Tek 3L5 left2.jpeg | Left | |||
Tek 3L5 right2.jpeg | Right | |||
Image:Tek 3l5 front.jpg | 1 MΩ Version | |||
Tek_3L5_LateSN.jpeg | 1 MΩ Later Version with Video Filter Switch | |||
3L5_LHS.jpeg | LHS | |||
3L5_RHS.jpeg | RHS | |||
3L5_Top.jpeg | Top | |||
3L5_Bottom.jpeg | Bottom | |||
3L5_Filter-Chassis_1.jpeg|Internals - 3 MHz Filter, 2nd LO (3.1 MHz) and 2nd Mixer. | |||
3L5_Filter-Chassis_2.jpeg|Internals - 3 MHz Filter, 2nd LO (3.1 MHz) and 2nd Mixer. | |||
158-0022-00_1.jpeg | Internals - 100 kHz Crystal from Variable Resolution Amp [[158-0022-00]] | |||
158-0022-00_2.jpeg | Internals - 100 kHz crystal from Variable Resolution Amp [[158-0022-00]] | |||
</gallery> | |||
'''75 Ω version''' | |||
<gallery> | |||
3l5 18mhz fr2.JPG | 75 Ω Version of 3L5, Front | |||
Tek 3l5 75ohm 1.jpg | 75 Ω Version, Front/Top | |||
Tek 3l5 75ohm 4.jpg | 75 Ω Version, Left | |||
Tek 3l5 75ohm 5.jpg | 75 Ω Version, Top | |||
Tek 3l5 75ohm 6.jpg | 75 Ω Version, Bottom/Left | |||
3l5 18mhz l.JPG | 75 Ω Version | |||
3l5 18mhz l2.JPG | 75 Ω Version | |||
3l5 18mhz rr2.JPG | 75 Ω Version, Back | |||
</gallery> | |||
==Components== | |||
{{Parts|3L5}} | |||
[[Category:Spectrum analyzers]] | |||
[[Category:560 series plugins]] | |||