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{{Oscilloscope Sidebar |
{{Oscilloscope Sidebar |manufacturer=Tektronix |designers= |
title=Tektronix 432 |
series=400-series scopes |
model=432 |
summary=25 MHz dual trace portable scope |
summary=25 MHz dual trace portable scope |
image=Tek 432 2.jpg |
image=Tek 432 trace.jpg |
caption=Tektronix 432 |
caption=Tektronix 432 |
introduced=1971 |
introduced=1971 |
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manuals=
manuals=
* [http://bama.edebris.com/download/tek/432/Tek432.pdf Tektronix 432 Manual (PDF)]
* [http://bama.edebris.com/download/tek/432/Tek432.pdf Tektronix 432 Manual (PDF)]
* [[Media:Tek 432 and 434 fcp april 1972.pdf|Tektronix 432 and 434 Factory Calibration Procedure, April 1972 (PDF, needs OCR)]]
}}
}}
The '''Tektronix 432''' is a 25 MHz dual-trace portable solid-state oscilloscope.   
The '''Tektronix 432''' is a 25 MHz dual-trace portable solid-state oscilloscope.   
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There is also a rack-mount version, the R432.   
There is also a rack-mount version, the R432.   


Each 432 vertical signal channel starts with the coupling switch,
Each 432 vertical signal path starts with the coupling switch,
then a [[rotary cam attenuator]],  
then a [[rotary cam attenuator]],  
then a dual-JFET source-follower buffer amp,  
then a dual-JFET source-follower buffer amp,  
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==Specifications==
==Specifications==
[[Category:Specifications needed]]''please add''
[[Category:Specifications needed]]''please add''
==Links==
* Ken Matheson, ''Servicing the 432/434 Oscilloscopes''. In [[Media:Tekscope 1972 V4 N5 Sep 1972.pdf|Tekscope Vol. 4 No. 5, 1972]]
* [[050-0674-00|Handle Replacement Modification Kit]]


==Pictures==
==Pictures==
<gallery>
<gallery>
Image:Tek 432 1.jpg
Tek 432 1.jpg
Image:Tek 432 2.jpg
Tek 432 2.jpg
Image:Tek 432 3.jpg
Tek 432 3.jpg
File:Tek_432_internal_1.jpg
Tek_432_internal_1.jpg|This shows the area around the BNC input connectors for channels 1 and 2.  This photo was taken when the owner was cleaning the vertical gain rotary switches which had become flaky after 45 years.
This shows the area around the BNC input connectors for channels 1 and 2.  I was cleaning the vertical gain rotary switches which had become flaky after 45 years.
Tek_432_internal_2.jpg|View from the rear.  The vertical gain attenuator switches are under the metal covers.
File:Tek_432_internal_2.jpg
Tek_432_internal_3.jpg|When the metal covers are removed, one can see the shaping/compensation capacitors.  These can be unplugged, each one has 6 legs.
View from the rear.  The vertical gain attenuator switches are under the metal covers.
Tek_432_internal_4.jpg|Another view of the shaping capacitors.  Work on one channel at a time to avoid mixing these up. Carefully clean the legs with isopropal alcohol and paper towels.   
File:Tek_432_internal_3.jpg
Tek_432_internal_5.jpg|In order to access the rotary gain switch fingers, one must first remove these BNC connectors, which means unsoldering the central wire (connects to a resistor/inductor feed-through) plus a debouce capacitor and lead going to the x1 x10 indicator lights.
When the metal covers are removed, one can see the shaping/compensation capacitors.  These can be unplugged, each one has 6 legs.
Tek_432_internal_6.jpg|Close up view of BNCs
File:Tek_432_internal_4.jpg
Tek_432_internal_7.jpg|Close up view of BNCs
Another view of the shaping capacitors.  Work on one channel at a time to avoid mixing these up. Carefully clean the legs with isopropal alcohol and paper towels.   
Tek_432_internal_8.jpg|Close up view of BNCs.  These need to be unsoldered for removal, but nothing else must be unsoldered to access/clean the vertical gain rotary switch.
File:Tek_432_internal_5.jpg
Tek_432_internal_9.jpg|View of the input preamp.  This board needs to be unplugged only, but not removed or unsoldered.  It has four 2-pin connectors.  Then it can be removed, still attached to the compensation capacitor carriers.
In order to access the rotary gain switch fingers, one must first remove these BNC connectors, which means unsoldering the central wire (connects to a resistor/inductor feed-through) plus a debouce capacitor and lead going to the x1 x10 indicator lights.
Tek_432_internal_10.jpg|Lifting off the assembly consisting of the 2 compensation capacitor carrier  plus the vertical preamp board  plus the  push-button switch board for CH1/CHOP/ALTERNATE/CH2.  The switch board has two plug connectors below that must be removed.  It helps to have long fingers or a good pair of needle nose pliers.
File:Tek_432_internal_6.jpg
Tek_432_internal_11.jpg|Second view under the assembly being removed.
Close up view of BNCs
Tek_432_internal_12.jpg|The rotary switches exposed. Each one has four contact fingers underneath.  They are cleaned using small (5mm) wide strips of paper soaked in isopropanol alcohol (2-propanol).
File:Tek_432_internal_7.jpg
Tek_432_internal_13.jpg|One can just see the four contact fingers peeking out.  You can get paper under them using small tweezers.  Patience and calm are required.
Close up view of BNCs
Tek_432_internal_14.jpg|A view of the variable-gain potentiometers. Note that the bodies are both cracked in the same place.  Both had been noisy, but the noise was largely eliminated by sweeping them back and forth a dozen times.  That may have scrubbed off the oxide.
File:Tek_432_internal_8.jpg
Tek_432_internal_15.jpg|A view of the contact fingers underneath the capacitor shaping blocks.  Each channel has 8 NC and 8 NO fingers (the other half are on the bottom).  These are easy to reach and clean as described.  So each channel has a total of 20 contact fingers to clean.
Close up view of BNCs.  These need to be unsoldered for removal, but nothing else must be unsoldered to access/clean the vertical gain rotary switch.
</gallery>
File:Tek_432_internal_9.jpg
View of the input preamp.  This board needs to be unplugged only, but not removed or unsoldered.  It has four 2-pin connectors.  Then it can be removed, still attached to the compensation capacitor carriers.
File:Tek_432_internal_10.jpg


Lifting off the assembly consisting of the 2 compensation capacitor carrier  plus the vertical preamp board  plus the  push-button switch board for CH1/CHOP/ALTERNATE/CH2.  The switch board has two plug connectors below that must be removed.  It helps to have long fingers or a good pair of needle nose pliers.
{{Custom ICs|432}}


File:Tek_432_internal_11.jpg
Second view under the assembly being removed.
File:Tek_432_internal_12.jpg
The rotary switches exposed. Each one has four contact fingers underneath.  They are cleaned using small (5mm) wide strips of paper soaked in isopropanol alcohol (2-propanol).
File:Tek_432_internal_13.jpg
One can just see the four contact fingers peeking out.  You can get paper under them using small tweezers.  Patience and calm are required.
File:Tek_432_internal_14.jpg
A view of the variable-gain potentiometers. Note that the bodies are both cracked in the same place.  Both had been noisy, but the noise was largely eliminated by sweeping them back and forth a dozen times.  I guess that scrubbed off the oxide.
File:Tek_432_internal_15.jpg
A view of the contact fingers underneath the capacitor shaping blocks.  Each channel has 8 NC and 8 NO fingers (the other half are on the bottom).  These are easy to reach and clean as described.  So each channel has a total of 20 contact fingers to clean.
</gallery>


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

Revision as of 02:55, 22 November 2021

Tektronix 432
25 MHz dual trace portable scope
Tektronix 432

Produced from 1971 to (?)

Manuals
Manuals – Specifications – Links – Pictures

The Tektronix 432 is a 25 MHz dual-trace portable solid-state oscilloscope.

There is also a rack-mount version, the R432.

Each 432 vertical signal path starts with the coupling switch, then a rotary cam attenuator, then a dual-JFET source-follower buffer amp, then a 155-0050-00 differential amplifier (switched to 155-0050-01 after serial number B239999).

The vertical and horizontal output amplifiers are fully discrete, using silicon bipolar transistors.

Triggering is done by a 4.7 mA tunnel diode that is fed by a discrete trigger amplifier.

The 432 consumes 55 watts maximum and weighs 20 pounds.

P31 phosphor was standard. P7 was also available.

Specifications

please add

Links

Pictures

Custom ICs used in the 432

Page Model Part nos Description Designers Used in
155-0028-00 M018 155-0028-00 155-0028-01 155-0042-00 155-0042-01 155-0042-02 155-0042-03 Miller integrator and delay pickoff Joe Burger 5030 R5030 5031 R5031 1401 1401A 1480 1481 1482 1485 26G1 26G2 26G3 314 335 432 434 4701 5B10N 5B12N 5B31 5B40 5B42 5S14N 7B52 7B53A 7B53N 7L12 7L13 7L14 7L18 7S14 AN/USM-281C RG501 Telequipment D63 Telequipment DM63
155-0048-01 M052F 155-0048-00 155-0048-01 155-0055-00 155-0055-01 trigger sweep Dave Allen 211 212 213 214 432 433 5B12N 5B13N 5L4N 603 604 605 606 607 624 SC501 R7912
155-0050-01 M065 155-0050-00 155-0050-01 differential vertical preamplifier Bert tenKate 432 434
155-0051-00 155-0051-00 155-0051-00 Z-axis and HV regulator 432 434