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{{Oscilloscope Sidebar |
title=Tektronix 517 |
summary=50 MHz scope |
image=Tek 517 front.jpg|
caption= Tektronix 517 front view |
introduced=1951 |
discontinued=1965 |
manuals=
* [http://w140.com/tek_517_calibration.pdf Tektronix 517 Calibration Guide]
* [http://w140.com/tek_517_early.pdf Early 517 Manual (PDF)]
* [http://w140.com/tek_517_early_OCR.pdf Early 517 Manual (PDF, OCR)]
* [http://w140.com/tek_517_517a_v2.pdf Later Manual Covering the 517 and 517A (PDF)]
* [http://w140.com/tek_517_517a_OCR.pdf Later Manual Covering the 517 and 517A (PDF, OCR)]
}}
The '''Tektronix 517''' is a 50 MHz scope [[introduced in 1950]] or [[introduced in 1951|1951]].  The power supply is an external box, like the [[507]], [[551]] and [[555]].  [[Category:Introduced in 1950]]
The '''Tektronix 517''' is a 50 MHz scope [[introduced in 1950]] or [[introduced in 1951|1951]].  The power supply is an external box, like the [[507]], [[551]] and [[555]].  [[Category:Introduced in 1950]]
The 517 does not take plug-ins.  There is also a 517A.
The 517 does not take plug-ins.  There is also a 517A (1955-1965).


== Historic Context ==
==Specifications==
The power consumption of a 517 is 1250 watts.  The indicator unit weighs 76 pounds and the external
power supply weighs 72 pounds. 
 
=== Historic Context ===
The 517 closely resembles a scope that Tektronix developed under a contract  
The 517 closely resembles a scope that Tektronix developed under a contract  
for the US military during 1949 and 1950.  (See link below.)
for the US military during 1949 and 1950.  (See link below.)
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</blockquote>
</blockquote>


== External Power Supply ==
==Internals==
=== External Power Supply ===
The external power supply and oscilloscope are connected by a removable cable
The external power supply and oscilloscope are connected by a removable cable
with a Jones plug on one end and a Jones socket on the other end.   
with a Jones plug on one end and a Jones socket on the other end.   
Units with serial numbers from 101 through 1739 use 12-pin Jones 2412 connectors;  
Units with serial numbers from 101 through 1739 use 12-pin Jones 2412 connectors;  
after that it is a 16-pin Jones connector. (Was a 16-pin Jones connector used or
after that it is a 16-pin Jones connector.  
did they go directory from the 12-pin Jones connector to the 16-pin Amphenol power connector
''(Was a 16-pin Jones connector used or did they go directory from the 12-pin Jones connector to the 16-pin Amphenol power connector used by the [[555]]?)''
used by the [[555]]?) The voltages on the 12-pin connector are:


* Pin 1: +750V, regulated
The voltages on the 12-pin connector are:
* Pin 2: +475V, regulated
 
* Pin 3: +350V, unregulated
* Pin 1: +750 V, regulated
* Pin 4: +225V, regulated
* Pin 2: +475 V, regulated
* Pin 5: +150V, regulated
* Pin 3: +350 V, unregulated
* Pin 4: +225 V, regulated
* Pin 5: +150 V, regulated
* Pin 6: Ground
* Pin 6: Ground
* Pin 7: -250V, regulated
* Pin 7: -250 V, regulated
* Pin 8: +180V, unregulated
* Pin 8: +180 V, unregulated


Later 517A units uses the same cable as the [[551]] and [[555]].   
Later 517A units uses the same cable as the [[551]] and [[555]].   
Although they use the same cable, they are completely incompatible.
Although they use the same cable, they are completely incompatible.
The voltages are different.  The 517's external power supply
The voltages are different.  The 517's external power supply
provides +750V to the indicator unit.  The highest voltage provided by
provides +750 V to the indicator unit.  The highest voltage provided by
the 555 and 551 power supplies is +500V.  Also, for example, the 517A
the 555 and 551 power supplies is +500V.  Also, for example, the 517A
has +180 on pin 8 of the 16-pin connector while the 555 and 551 have
has +180 V on pin 8 of the 16-pin connector while the 555 and 551 have
-150V on pin 8.   
-150 V on pin 8.   


== Distributed Amplifiers ==
=== Distributed Amplifiers ===
The 517 makes extensive use of the [[distributed amplifier]] concept.   
The 517 makes extensive use of the [[distributed amplifier]] concept.   
Originally the [[5XP]] CRT was used,  
Originally the [[5XP]] CRT was used,  
which has 38V/cm vertical deflection sensitivity when operated with 24kV acceleration voltage.  
which has 38 V/cm vertical deflection sensitivity when operated with 24 kV acceleration voltage.  
(Is this correct?  It doesn't agree with the 5XP datasheet.)
''(Is this correct?  It doesn't agree with the 5XP datasheet.)''
Since the vertical sensitivity at the input connector is 0.1V/cm, we can calculate that  
 
Since the vertical sensitivity at the input connector is 0.1 V/cm, we can calculate that  
the voltage gain from the input connector to the vertical deflection plates is 380.  
the voltage gain from the input connector to the vertical deflection plates is 380.  
For 4cm deflection, a 152-volt differential output swing is required.  There are DC blocking  
For 4 cm deflection, a 152 V differential output swing is required.  There are DC blocking  
capacitors at various places in the signal path.  The slowest sweep is 20 us/cm.  The 517 is  
capacitors at various places in the signal path.  The slowest sweep is 20 μs/cm.  The 517 is  
not designed for low-frequency use.  
not designed for low-frequency use.  
The vertical signal path is as follows:
The vertical signal path is as follows:


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There is a trigger amplifier in the 517 which can take its input from  
There is a trigger amplifier in the 517 which can take its input from  
an external source, or  
an external source, or from the trigger pickoff in the vertical pre-amp, or  
from the trigger pickoff in the vertical pre-amp, or  
from the internal rate generator circuit.  The trigger amplifier circuit has
from the internal rate generator circuit.   
The trigger amplifier circuit has
five stages:
five stages:


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* Gain Stage 4: single-ended, common-cathode, [[6AG7]] pentode
* Gain Stage 4: single-ended, common-cathode, [[6AG7]] pentode


== High Voltage Power Supply ==
=== High Voltage Power Supply ===
The 517 uses 24kV total acceleration voltage on the CRT.  This is generated by the Type 420 High Voltage
The 517 uses 24 kV total acceleration voltage on the CRT.  This is generated by the Type 420 High Voltage
Power Supply subsystem in the 517.  It uses a 1.8kHz oscillator to produce the high voltage, unlike
Power Supply subsystem in the 517.  It uses a 1.8 kHz oscillator to produce the high voltage, unlike
other Tek scopes which use HV oscillators in the ultrasonic range.
other Tek scopes which use HV oscillators in the ultrasonic range.
The 517 has a switch on the front panel that selects between normal vertical sensitivity,
The 517 has a switch on the front panel that selects between normal vertical sensitivity,
which uses the full 24kV acceleration voltage, and "X2" mode, which drops the acceleration
which uses the full 24 kV acceleration voltage, and "X2" mode, which drops the acceleration
voltage to 12kV for a doubling of the vertical sensitivity.  The control works by  
voltage to 12 kV for a doubling of the vertical sensitivity.  The control works by  
switching the the voltage division ratio of the feedback to the error amplifier in the HV supply.
switching the the voltage division ratio of the feedback to the error amplifier in the HV supply.
   
   
The power consumption of a 517 is 1250 watts.  The indicator unit weighs 76 pounds and the external
power supply weighs 72 pounds. 
== CRTs Used in the 517 ==
== CRTs Used in the 517 ==
517 units with serial numbers 101 through 925 use the DuMont 5XP CRT.   
517 units with serial numbers 101 through 925 use the DuMont 5XP CRT.   
Later units use a Tek-made CRT, the T517PxH/T54PxH, where "x" designates
Later units use a Tek-made CRT, the T517PxH/T54PxH, where "x" designates
the [[phosphor]] type: 1, 2, 7, 11, or 16.  The 5XP has three anode connections:
the [[phosphor]] type: 1, 2, 7, 11, or 16.  The 5XP has three anode connections:
6.6kV, 13.3kV, and 20kV.  The Tek-made CRT has just one anode connection, 20kV,
6.6 kV, 13.3 kV, and 20 kV.  The Tek-made CRT has just one anode connection, 20 kV,
and has 15 V/cm sensitivity at 24kV total acceleration voltage.
and has 15 V/cm sensitivity at 24 kV total acceleration voltage.


The 517 might be the only Tektronix instrument to have a part made of wood.
The 517 might be the only Tektronix instrument to have a part made of wood.
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== Comparison of 517 with 547 ==
== Comparison of 517 with 547 ==
In 1965, following the introduction of the 50MHz [[547]], the
In 1965, following the introduction of the 50 MHz [[547]], the
517 was discontinued.  The 547 uses a non-distributed solid-state vertical
517 was discontinued.  The 547 uses a non-distributed solid-state vertical
amplifier, [[tunnel diodes|tunnel diode]] triggering, and a 6.5 V/cm CRT,  
amplifier, [[tunnel diodes|tunnel diode]] triggering, and a 6.5 V/cm CRT,  
thereby achieving good performance with
thereby achieving good performance with
lower cost, size, weight, complexity, and power consumption than the 517.
lower cost, size, weight, complexity, and power consumption than the 517.
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The [[P170CF]] cathode-follower probe was designed for use with the 517.
The [[P170CF]] cathode-follower probe was designed for use with the 517.


== Links==
* [http://w140.com/tektronix_milspec_high_speed_scope_OCR.pdf Final Report on Tektronix MILSPEC High Speed Scope (PDF, cleaned up and OCR)]
* [http://w140.com/tektronix_milspec_high_speed_scope_OCR.pdf Final Report on Tektronix MILSPEC High Speed Scope (PDF, cleaned up and OCR)]
* [http://w140.com/tektronix_milspec_high_speed_scope.pdf Final Report on Tektronix MILSPEC High Speed Scope (5MB, PDF, cleaned up)]  
* [http://w140.com/tektronix_milspec_high_speed_scope.pdf Final Report on Tektronix MILSPEC High Speed Scope (5MB, PDF, cleaned up)]  
* [http://w140.com/MILSPEC_High_Speed_Scope.pdf Final Report on Tektronix MILSPEC High Speed Scope (220MB, PDF, original)]
* [http://w140.com/MILSPEC_High_Speed_Scope.pdf Final Report on Tektronix MILSPEC High Speed Scope (220MB, PDF, original)]
* [http://w140.com/tek_517_calibration.pdf Tektronix 517 Calibration Guide]
* [http://w140.com/tek_517_early.pdf Early 517 Manual (PDF)]
* [http://w140.com/tek_517_early_OCR.pdf Early 517 Manual (PDF, OCR)]
* [http://w140.com/tek_517_517a_v2.pdf Later Manual Covering the 517 and 517A (PDF)]
* [http://w140.com/tek_517_517a_OCR.pdf Later Manual Covering the 517 and 517A (PDF, OCR)]
* [http://w140.com/flynn_johnson_fast_gray_wedge.pdf Flynn and Johnson "Fast Grey Wedge Analyzer for High Input Rates"]
* [http://w140.com/flynn_johnson_fast_gray_wedge.pdf Flynn and Johnson "Fast Grey Wedge Analyzer for High Input Rates"]
* [http://w140.com/thomas_and_hearst-measurement_of_exploding_wire_energy.pdf Thomas and Hearst, "An Electronic Scheme for Measurement of Exploding Wire Energy"]
* [http://w140.com/thomas_and_hearst-measurement_of_exploding_wire_energy.pdf Thomas and Hearst, "An Electronic Scheme for Measurement of Exploding Wire Energy"]


==Pictures ==
<gallery>
<gallery>
Image:517_cat_whole.jpg|front
File:517_cat_whole.jpg|front
Image:517_cat_int_left.jpg|bottom internal
File:517_cat_int_left.jpg|bottom internal
Image:517_cat_int_right.jpg|right internal
File:517_cat_int_right.jpg|right internal
Image:517_cat_int_top.jpg|top internal
File:517_cat_int_top.jpg|top internal
Image:517_cat_ps_int.jpg|power supply internal
File:517_cat_ps_int.jpg|power supply internal
Image:517 power connector.jpg|12-pin Jones socket on power supply
File:517 power connector.jpg|12-pin Jones socket on power supply
Image:Jones 12pin male.jpg|12-pin Jones plug
File:Jones 12pin male.jpg|12-pin Jones plug
Image:Jones 12m inside.jpg|12-pin Jones plug inside
File:Jones 12m inside.jpg|12-pin Jones plug inside
Image:Tek 517 420 hv.jpg|High voltage supply
File:Tek 517 420 hv.jpg|High voltage supply
Image:Tek 517 front.jpg|Front view
File:Tek 517 front.jpg|Front view
Image:Tek 517 indicator jones.jpg|12-pin Jones connector on indicator unit
File:Tek 517 indicator jones.jpg|12-pin Jones connector on indicator unit
Image:Tek 517 left.jpg|Left internal view
File:Tek 517 left.jpg|Left internal view
Image:Tek 517 vert output.jpg|Distributed vertical output amplifier
File:Tek 517 vert output.jpg|Distributed vertical output amplifier
Image:Tek 517 wood cap support.jpg|Wooden support for capacitor C826
File:Tek 517 wood cap support.jpg|Wooden support for capacitor C826
Image:Tek crt table.png|Tek CRT Reference Chart
File:Tek crt table.png|Tek CRT Reference Chart
Image:517 trig amp underside.jpg
File:517 trig amp underside.jpg
Image:517 vert stages one through three.jpg
File:517 vert stages one through three.jpg
Image:517 4th vert stage.jpg
File:517 4th vert stage.jpg
Image:517 right internals.jpg
File:517 right internals.jpg
Image:517 timing switch 2.jpg
File:517 timing switch 2.jpg
Image:517 timing switch 1.jpg
File:517 timing switch 1.jpg
Image:517 power test point.jpg
File:517 power test point.jpg
Image:517 hv osc.jpg
File:517 hv osc.jpg
Image:Tek 517a vert pre.png
File:Tek 517a vert pre.png
Image:Tek 517a vert amp.png
File:Tek 517a vert amp.png
Image:Tek 517a trigger amp.png
File:Tek 517a trigger amp.png
Image:Tek 517 late sweep.png
File:Tek 517 late sweep.png
Image:Tek 517a crt circuit.png
File:Tek 517a crt circuit.png
Image:Tek 517a trigger rate gen.png
File:Tek 517a trigger rate gen.png
Image:517 ps fan.jpg
File:517 ps fan.jpg
Image:517 ps bottom left.jpg
File:517 ps bottom left.jpg
Image:517 ps bottom right.jpg
File:517 ps bottom right.jpg
Image:517 ps front left int.jpg
File:517 ps front left int.jpg
Image:517 ps right rear bottom.jpg
File:517 ps right rear bottom.jpg
Image:517 ps bottom.jpg
File:517 ps bottom.jpg
Image:517 ps right int.jpg
File:517 ps right int.jpg
Image:517 assembly2.jpg
File:517 assembly2.jpg
Image:B170_A.JPG| 170 ohms Attenuator  
File:B170_A.JPG| 170 ohms Attenuator  
File:Tek 517 ad.jpg
File:Tek 517 ad.jpg
File:517a rear vert interface.jpg|Direct CRT access mod
File:517a rear vert interface.jpg|Direct CRT access mod
Retrieved from "https://w140.com/tekwiki/wiki/Special:MobileDiff/12941"

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