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title=Tektronix 475 |
title=Tektronix 475 |
summary=Portable 200 MHz dual-trace scope |
summary=Portable 200 MHz dual-trace scope |
image=Tek 475a front.jpg |
image=Tek 475 square sin.jpg |
caption= Tektronix 475A |
caption= Tektronix 475 |
introduced=1972 |
introduced=1972 |
discontinued=1983 |
discontinued=1983 |
manuals=
manuals=
'''475'''
* [http://w140.com/tek_475_tek.pdf Tektronix 475 Manual (65MB file, ok quality, PDF)]
* [http://w140.com/tek_475_tek.pdf Tektronix 475 Manual (65MB file, ok quality, PDF)]
* [http://w140.com/Tektronix_475_Oscilloscope_Service_Manual.pdf Tektronix 475 Manual (108MB file, good quality, PDF)]
* [http://w140.com/Tektronix_475_Oscilloscope_Service_Manual.pdf Tektronix 475 Manual (108MB file, good quality, PDF)]
* [[Media:TB-9-6625-2240-35.pdf|475 calibration (Army) (OCR)]]
* [[Media:070-1332-00.pdf|Tektronix 475 Manual (65MB file, ok quality, PDF, OCR, bad-OCR)]]
* [[Media:475_DM44_op.pdf|Tektronix 475/DM44 Operators Manual (16MB file, PDF)]]
'''475A'''
* [[Media:070-2163-00.pdf|Tektronix 475A-DM44 Oscilloscope Instruction Manual (OCR, PDF)]]
* [[Media:070-2162-00.pdf|Tektronix 475A Manual (11MB, PDF)]]
* [[Media:tek_475a_block_diagram.pdf|Tektronix 475A Schematics (PDF, OCR, bad-OCR)]]
* [http://w140.com/tek_475a_schematics.pdf  Tektronix 475A Schematics (PDF)]
* [http://w140.com/tek_475a_schematics.pdf  Tektronix 475A Schematics (PDF)]
'''Modifications'''
* [[Media:050-1558-00.pdf|Modification: U3165 Replacement]]
* [[Media:062-2784-00.pdf|067-0676-00 Vertical Insertion Unit for 475 Datasheet (PDF, needs OCR)]]
'''History'''
* [[Media:Tek 465 and 475 marketing sales release.pdf|Tektronix 465 and 475 Marketing Sales Release (PDF)]]
* [[Media:tek_475a_msr.pdf|Tektronix 475A Marketing Sales Release (PDF, OCR, bad-OCR)]]
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* [http://w140.com/tek_475a_description.pdf Tektronix 475A Marketing Sales Release (PDF)]
* [http://w140.com/tek_475a_description.pdf Tektronix 475A Marketing Sales Release (PDF)]
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}}
The '''Tektronix 475''' is a portable dual-trace oscilloscope with dual time-bases similar to the [[465]],
but with 200 MHz bandwidth and a maximum vertical sensitivity of 2 mV/Div.
It is all solid-state except for the CRT.
It was introduced in November 1972.


''475A [[list of manuals that are needed|manual needed]] (no good quality free scan available)''
Military variant is called OS-261 C(v)1/0, which has DC/DC converter (12/24V input) on board.
}}
The '''Tektronix 475''' is a portable dual-trace oscilloscope with dual time-bases similar to the [[465]], but with 200 MHz bandwidth and a maximum vertical sensitivity of 2 mV/Div. It is all solid-state except for the CRT.  It was introduced in November 1972.


A revised version, the 475A, has 250 MHz bandwidth and a maximum vertical sensitivity of 5 mV/Div. The [[1106]] is a battery pack for the 475.
A revised version, the 475A, has 250 MHz bandwidth and a maximum vertical sensitivity of 5 mV/Div.
The [[1106]] is a battery pack for the 475.


The optional [[DM44]] multimeter attaches to the top of the instrument.
The optional [[DM44]] multimeter attaches to the top of the instrument.


==Specifications==
{{BeginSpecs}}
[[Category:Specifications needed]] ''please add''
{{Spec | Bandwidth | 200 MHz (475), AC cutoff 10 Hz, switchable BW limit 20 MHz }}
{{Spec | Rise time | 1.75  ns (475) }}
{{Spec | Deflection | 2 mV/Div to 5 V/Div, 1-2-5 }}
{{Spec | Cascaded mode | 400 μV/Div, 50 MHz with CH1 input connected to CH2 VERT SIG OUT }}
{{Spec | Time base | 10 ns/Div to 500 ms/Div, 1-2-5, and ×10 magnifier }}
{{Spec | Input impedance | 1 MΩ // 20 pF }}
{{Spec | Triggering | 0.3 Div (int) or 50 mV (ext) to 40 MHz, increasing to 1.5 Div/250 mV at 200 MHz; AC coupling >60 Hz; LF REJ >50 kHz, HF REJ <50 kHz }}
{{Spec | X bandwidth | 3 MHz }}
{{Spec | Z axis input | 5 V<sub>p-p</sub>, 50 MHz }}
{{Spec | Calibrator | 1 kHz, 30 mA / 300 mV square wave }}
{{Spec | Outputs | CH2 Vert Signal Out, 20 mV/Div into 1 MΩ or 10 mV/Div into 50 Ω; A and B +GATE OUT, +5 V; [[LEMO S-series connector|Probe power jack]] }}
{{Spec | CRT | 8 × 10 cm², P31 phosphor (P11 opt.)  }}
{{Spec | Power | 110, 115, 120, 220, 230 or 240  V<sub>AC</sub> ±10%, 48-440 Hz, max. 100 W }}
{{EndSpecs}}


==Internals==
==Internals==
The 475 uses a number of Tek-made integrated circuits, including the [[155-0032-01]] input preamplifier, [[155-0085-00]] input amplifier, [[155-0078-00]] vertical amplifier, [[155-0091-00]] channel switch, [[155-0082-00]] vertical output amplifier, and [[155-0049-00]] sweep control.
The 475 uses a number of Tek-made integrated circuits, including the [[155-0032-01]] input preamplifier,
[[155-0085-00]] input amplifier, [[155-0078-00]] vertical amplifier, [[155-0091-00]] channel switch,
[[155-0082-00]] vertical output amplifier, and [[155-0049-00]] sweep control.


==Links==
==Links==
* [https://lazyelectrons.wordpress.com/2018/02/18/tektronix-475a-dm44-repair/ Lazy Electrons Tektronix 475A & DM44 Repair Page]
* The New Look in Portables, in [[Media:Tekscope 1972 V4 N5 Sep 1972.pdf|Tekscope Vol. 4 No. 5, 1972]]
* The New Look in Portables, in [[Media:Tekscope 1972 V4 N5 Sep 1972.pdf|Tekscope Vol. 4 No. 5, 1972]]
* [http://www.amplifier.cd/Test_Equipment/Tektronix/Tektronix_other/475.htm Tek 475] / [http://www.amplifier.cd/Test_Equipment/Tektronix/Tektronix_other/475A_DM44.htm Tek 475A] @ amplifier.cd
* [http://www.amplifier.cd/Test_Equipment/Tektronix/Tektronix_other/475.htm Tek 475] / [http://www.amplifier.cd/Test_Equipment/Tektronix/Tektronix_other/475A_DM44.htm Tek 475A] @ amplifier.cd
* [https://www.youtube.com/watch?v=2SESaF7Ibbw Tek 475A in operation] @ YouTube
* [https://www.youtube.com/watch?v=2SESaF7Ibbw Tek 475A in operation] @ YouTube
* [[050-0674-00|Handle Replacement Modification Kit]]
==Common Problems==
* See [[475/Repairs]]


==Pictures==
==Pictures==
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475A_1.JPG | Tektronix 475A
475A_1.JPG | Tektronix 475A
Tek 475a front.jpg | Tektronix 475A
Tek 475a front.jpg | Tektronix 475A
Tek 475 mix mode.jpg|Tek 475 in mixed sweep ("MIX") horizontal mode
Tek 475a dm44 trace.jpg|475A with [[DM44]]
Tek 475 square sin.jpg|475
Tek 475 rear.jpg|475 rear
Tek 475a trace dm44.jpg|475A with [[DM44]]
Tek 475 dual sine.jpg|475
Tek_475A_Time-Freq.jpg | 475A Time/Frequency Measurement with [[DM44]], HP Frequency Counter used for Verifying [[DM44]] Output.
Tek 475a rear.jpg|475A rear
Tek_OS_261_rear.jpg | 475 (OS-261 C) rear, with DC-Input
475A_A9-Interface_board.jpg | 475A A9 Interface Board
475A_A6_Fan_motor.jpg |475A A6 & Fan Motor
475A_A9-PowerSupply.jpg | 475A Power Supply Section of A9
475A_DMM44_Board.jpg | 475A with [[DM44]] Board on top
475A_A3-Vertical_Preamp.jpg | 475A A3 Vertical Preamp Board
Tek475DM44 1khz.jpg | 475/DM44 measuring a 1 kHz sine wave
Tek475DM44 10khz.jpg | 475/DM44 measuring a 10 kHz sine wave
Tek475DM44 100khz.jpg | 475/DM44 measuring a 100 kHz sine wave
</gallery>
</gallery>


[[Category:400 series scopes]]
[[Category:400 series scopes]]
[[Category:Specifications needed]]
[[Category:Manual needed]]
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