1L5: Difference between revisions

Latest revision as of 02:37, 15 March 2024

Tektronix 1L5
1 MHz Spectrum Analyzer Tektronix 1L5 Compatible with 500-series scopes Produced from 1967 to 1975 Manuals Tektronix 1L5 Manual Tektronix 1L5 Factory Calibration Procedure, September 1967 (All manuals in PDF format unless noted otherwise)

Manuals – Specifications – Links – Pictures

The Tektronix 1L5 is a low-frequency spectrum analyzer for 500-series scopes. It is very similar to the 3L5.

Its center frequency is set on a trio of rotary switches and can range from 50 Hz to 990 kHz. Minimum resolution bandwidth is 10 Hz. It has a 1 MΩ input resistance.

Type 1L5 was sold from 1967 until the end of the classic plug-in scope line. Not particularly accurate in either frequency, bandwidth, or amplitude, it was no match for HP's 141T/8556A/8552B combination in performance, but it was a small fraction of the price.

Although Type 1L5 can operate in any 500-series scope*, it is most useful by far in the Type 549 storage mainframe which allows slow sweeps needed to match the narrower resolution bandwidths.

In conjunction with the 015-0107-00 Swept Frequency Converter (tracking generator), the 1L5 can also measure frequency response.

* 531/535/541/545 need a wiring mod to alleviate vertical amp instability.

Key Specifications

please add

Links

Documents Referencing 1L5

Pictures

External

Front panel
Rear

Internal

top
right
left
bottom

Pre-production unit

Preproduction 1L5 (serial A01)
Preproduction 1L5 (serial A01)
Preproduction 1L5 (serial A01)

Measurements, Diagrams

1L5 works fine in 549
Measured frequency response of 3 MHz filter from P90 to P280 with Q290 removed to disable 3.1 MHz oscillator, but powered up. 10 dB/div.
Measured frequency response of 3 MHz filter. 1 dB/div.
Block Diagram
Attenuators and Input
Center Frequency Switching
Swept Frequency Generator
Variable Resolution Amplifier
Dispersion Warning Light
Output Amplifier
Calibrator
Interconnecting Plug and Power Distribution

Components

Some Parts Used in the 1L5

@@ Line 15: / Line 15: @@
 It is very similar to the [[3L5]].
-Its center frequency is set on a trio of rotary switches and can range from 50 Hz to
+Its center frequency is set on a trio of rotary switches and can range from 50 Hz to 990 kHz.  Minimum resolution bandwidth is 10 Hz.  It has a 1 MΩ input resistance.
-kHz.  Minimum resolution bandwidth is 10 Hz.  It has a 1 MΩ input resistance.
-Type 1L5 was sold from 1967 until the end of the classic plug-in scope
+Type 1L5 was [[introduced in 1967|sold from 1967]] until the end of the classic plug-in scope line.
-line.  Not particularly accurate in either frequency, bandwidth,
+Not particularly accurate in either frequency, bandwidth, or amplitude, it was no match for HP's 141T/8556A/8552B combination in performance, but it was a small fraction of the price.
-or amplitude, it was no match for HP's 141T/8556A/8552B combination in performance,
-but it was a small fraction of the price.
-Although Type 1L5 can operate in any 500-series scope*,
+Although Type 1L5 can operate in any 500-series scope*, it is most useful by far in the Type [[549]] storage mainframe which allows slow sweeps needed to match the narrower resolution bandwidths.
-it is most useful by far in the Type [[549]] storage mainframe
-which allows slow sweeps needed to match the narrower resolution bandwidths.
-In conjunction with the [[015-0107-00]] Swept Frequency Converter (tracking generator),
+In conjunction with the [[015-0107-00]] Swept Frequency Converter (tracking generator), the 1L5 can also measure frequency response.
-the 1L5 can also measure frequency response.
-<nowiki>*</nowiki> [[531]]/[[535]]/[[541]]/[[545]] need a wiring mod
+<nowiki>*</nowiki> [[531]]/[[535]]/[[541]]/[[545]] need a wiring mod to alleviate vertical amp instability.
-to alleviate vertical amp instability.
+{{MissingSpecs}}
+==Links==
+{{Documents|Link=1L5}}
 ==Pictures==
+'''External'''
 <gallery>
-Tek 1L5 bottom2.jpeg ‎
+Tek 1L5 front2.jpeg ‎| Front panel
-Tek 1L5 front2.jpeg ‎
+Tek 1l5 front.JPG
-Tek 1L5 left2.jpeg ‎
+Tek 1l5 2409.jpg
-Tek 1L5 rear2.jpeg ‎
-Tek 1L5 right2.jpeg ‎
-Tek 1L5 top2.jpeg
 Tek 1l5 1.jpg
 Tek 1l5 2.jpg
@@ Line 46: / Line 41: @@
 Tek 1l5 4.jpg
 Tek 1l5 5.jpg
-_1L5.JPG| 549 works fine with 1L5
+Tek 1l5 rear.JPG | Rear
+Tek 1L5 rear2.jpeg ‎
+</gallery>
+'''Internal'''
+<gallery>
+Tek 1L5 bottom2.jpeg ‎
+Tek 1L5 left2.jpeg ‎
+Tek 1L5 right2.jpeg ‎
+Tek 1L5 top2.jpeg
 Tek 1l5 top2.JPG|top
 Tek 1l5 right.JPG|right
-Tek 1l5 rear.JPG|rear
 Tek 1l5 left.JPG|left
-Tek 1l5 front.JPG|front
 Tek 1l5 bottom.JPG|bottom
-Tek 1l5 2409.jpg|1L5
+</gallery>
+'''Pre-production unit'''
+<gallery>
+Preproduction incomplete 1L5.jpg|Preproduction 1L5 (serial A01)
+Preproduction incomplete 1L5 left.jpg|Preproduction 1L5 (serial A01)
+Preproduction incomplete 1L5 right.jpg|Preproduction 1L5 (serial A01)
+</gallery>
+'''Measurements, Diagrams'''
+<gallery>
+_1L5.JPG | 1L5 works fine in [[549]]
+Tek 1L5 3MHz filter response 10db div.jpg|Measured frequency response of 3 MHz filter from P90 to P280 with Q290 removed to disable 3.1 MHz oscillator, but powered up. 10 dB/div.
+Tek 1L5 3MHz filter response 1db div.jpg|Measured frequency response of 3 MHz filter. 1 dB/div.
 Tek 1l5 block diagram.png|Block Diagram
 Tek 1l5 attenuators and input.png|Attenuators and Input
@@ Line 63: / Line 78: @@
 Tek 1l5 calibrator.png|Calibrator
 Tek 1l5 plug and power.png|Interconnecting Plug and Power Distribution
-Preproduction incomplete 1L5.jpg|Preproduction 1L5 (serial A01)
-Preproduction incomplete 1L5 left.jpg|Preproduction 1L5 (serial A01)
-Preproduction incomplete 1L5 right.jpg|Preproduction 1L5 (serial A01)
-Tek 1L5 3MHz filter response 10db div.jpg|Measured frequency response of 3 MHz filter from P90 to P280 with Q290 removed to disable 3.1 MHz oscillator, but powered up. 10 dB/div.
-Tek 1L5 3MHz filter response 1db div.jpg|Measured frequency response of 3 MHz filter. 1 dB/div.
 </gallery>