3L5: Difference between revisions

Revision as of 01:02, 29 September 2023

Tektronix 3L5
1 MHz Spectrum Analyzer Tektronix 3L5 Spectrum Analyzer Compatible with 560-series scopes Produced from 1967 to (?) manuals= Tektronix 3L5 Manual Tektronix 3L5 Factory Calibration Procedure, August 1967 Manuals {{{manuals}}} (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.

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 numbers listed 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	50 Hz to 990 kHz
Dispersion	10 Hz to 100 kHz
Input Impedance	1 MΩ // 30 pF
Input Voltage	Max. 300 V (DC + peak AC)
Vertical Resolution	Video - 100 mV/div to 100 V/div, LIN - 1 mV to 2 V_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 600 Ω
Weight	2.7 kg / 6 lbs

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

Components

Some Parts Used in the 3L5

Part	Part Number(s)	Class	Description	Used in
1N3182	152-0269-00	Discrete component	varactor diode	3L5 • 1L5 • 3T7 • 492 • 465M • 7844 • 2465
8416	154-0413-00 • 157-0116-00	Vacuum Tube (Dual Triode)	dual triode	1S1 • 2A61 • 3A8 • 3L5 • W

@@ Line 1: / Line 1: @@
-{{Plugin Sidebar |
+{{Plugin Sidebar
-manufacturer=Tektronix |series=560-series scopes |type= 3L5 |
+|manufacturer=Tektronix
-summary=1 MHz Spectrum Analyzer |
+|series=560-series scopes
-image=Tek 3L5 front2.jpeg |
+|type=3L5
-caption=Tektronix 3L5 Spectrum Analyzer |
+|summary=1 MHz Spectrum Analyzer
-designers=  |
+|image=Tek 3L5 front2.jpeg
-introduced=1967 |
+|caption=Tektronix 3L5 Spectrum Analyzer
-discontinued=(?) |
+|introduced=1967
+|discontinued=(?)
 manuals=
-* [[Media:070-0630-01.pdf|Tektronix 3L5 Manual (PDF)]]
+* [[Media:070-0630-01.pdf|Tektronix 3L5 Manual]]
-* [[Media:Tek 3l5 fcp aug 1967.pdf|Tektronix 3L5 Factory Calibration Procedure, August 1967 (PDF)]]
+* [[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]].
+The '''Tektronix 3L5''' is a 50 Hz - 1 MHz spectrum analyzer plug-in for [[560-series scopes]]. It is very similar to the [[1L5]].
-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.
@@ Line 29: / Line 28: @@
 ===Timebase Support===
 L5 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 [[560_Series_plug-in_interface|plug-in connector]]).
+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"
@@ Line 36: / Line 36: @@
 ! SN#
 |-
-| [[2B67]] ||15180
+| [[2B67]] || <15180
 |-
-| [[3B1]]  ||4040
+| [[3B1]]  || <4040
 |-
-| [[3B3]]  ||4270
+| [[3B3]]  || <4270
 |-
-| [[3B4]]  ||740
+| [[3B4]]  || <740
 |}
 {{BeginSpecs}}
-{{Spec | Center Frequency Range | 50 Hz to 990 kHz}}
+{{Spec | Center Frequency    | 50 Hz to 990 kHz }}
-{{Spec | Dispersion Range | 10 Hz to 100 kHz}}
+{{Spec | Dispersion          | 10 Hz to 100 kHz }}
-{{Spec | Input Impedance | ≈ 1 MΩ  // 30 pF }}
+{{Spec | Input Impedance     | 1 MΩ // 30 pF }}
-{{Spec | Input Voltage | Max. 300 V (DC + peak AC) }}
+{{Spec | Input Voltage       | Max. 300 V (DC + peak AC) }}
-{{Spec | Vertical Resolution | Video - .1 v/div to 100 v/div, LIN - .001 V to 2V RMS}}
+{{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 | Internal Cal Signal | 5 kHz ±1% }}
-{{Spec | First LO Out | ≥1 MHz (Sweep), ≥1 V<sub>p-p</sub> into ≥1 kΩ}}
+{{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 600Ω}}
+{{Spec | Recorder Out        | 5 mV to 15 mV into 600 Ω }}
-{{Spec | Weight | ≈6 pounds }}
+{{Spec | Weight              | 2.7 kg / 6 lbs }}
 {{EndSpecs}}
@@ Line 87: / Line 87: @@
 </gallery>
+==Components==
+{{Parts|3L5}}
 [[Category:Spectrum analyzers]]
 [[Category:560 series plugins]]