3L5: Difference between revisions

Revision as of 12:34, 14 August 2021

Tektronix 3L5
1 MHz Spectrum Analyzer Tektronix 3L5 Spectrum Analyzer Compatible with 560-series scopes Produced from 1967 to (?) Manuals Tektronix 3L5 Manual (PDF) Tektronix 3L5 Factory Calibration Procedure, August 1967 (PDF) (All manuals in PDF format unless noted otherwise)

Manuals – Specifications – Links – Pictures

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 Generator" (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

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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 V_p-p into ≥1 kΩ
Recorder Out	5 mV to 15 mV into 600Ω
Weight	≈6 pounds

Pictures

1 MΩ version

1 MΩ Version
1 MΩ later version with Video Filter Switch
LHS
RHS
Top
Bottom
Internals - 3MHz Filter, 2nd LO(3.1MHz) and 2nd mixer.
Internals - 3MHz Filter, 2nd LO(3.1MHz) and 2nd mixer.
Internals - 100 kHz crystal from variable res amp 158-0022-00
Internals - 100 kHz crystal from variable res amp 158-0022-00

75 Ω version

75 Ω version of 3L5, front
75 Ω version, front/top
75 Ω version, left
75 Ω version, top
75 Ω version, bottom left
75 Ω version
75 Ω version
75 Ω version, back

@@ Line 1: / Line 1: @@
-{{Plugin Sidebar 2 |
+{{Plugin Sidebar |
-title=Tektronix 3L5 |
+manufacturer=Tektronix |series=560-series scopes |type= 3L5 |
 summary=1 MHz Spectrum Analyzer |
 image=Tek_3L5_LateSN.jpeg |
 caption=Tektronix 3L5 Spectrum Analyzer |
-series=[[560-series scopes]] |
+designers=  |
 introduced=1967 |
 discontinued=(?) |
@@ Line 11: / Line 11: @@
 * [[Media:Tek 3l5 fcp aug 1967.pdf|Tektronix 3L5 Factory Calibration Procedure, August 1967 (PDF)]]
 }}
 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 Generator" (tracking generator),
-the 3L5 can also be used to make scalar frequency response measurements.
+In conjunction with the [[015-0107-00]] "Swept Frequency Generator" (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). 3L5 is based on the swept-frontend design, where the first local Oscillator is swept for the spectrum scan.
+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.