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{{Oscilloscope Sidebar | | {{Oscilloscope Sidebar | ||
|manufacturer=Tektronix | |||
summary=50 MHz scope | | |series= | ||
image=Tek | |model=517 | ||
caption= Tektronix | |summary=50 MHz scope | ||
introduced=1951 | | |image=Tek 517a trace2.jpeg | ||
discontinued=1965 | | |caption=Tektronix 517A at VintageTek Museum | ||
manuals= | |introduced=1951 | ||
* [ | |discontinued=1965 | ||
|designers=Logan Belleville;Dick Rhiger | |||
|manuals= | |||
* [ | * [[Media:IM-517.pdf|Early 517 Manual (IM-517)]] (OCR) | ||
* [ | * [[Media:070-229.pdf|Later Manual (070-229) Covering the 517 and 517A]] (OCR) | ||
* [[Media:070-0229-00.pdf|Latest Manual (070-0229-00) Covering the 517 and 517A]] | |||
* [[Media: | * [[Media:Tek_517_calibration_guide.pdf|Tektronix 517 Calibration Guide]] (OCR) | ||
}} | }} | ||
The '''Tektronix 517''' is a 50 MHz scope [[introduced in 1950]] or [[introduced in 1951|1951]]. | 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]]. | It was designed by [[Logan Belleville]] and [[Dick Rhiger]]. | ||
The 517 does not take plug-ins. | The power supply is an external box, like in the [[507]], [[551]] and [[555]]. | ||
There is also a 517A (1955-1965). | The 517 does not take plug-ins. There is also a 517A (1955-1965). | ||
{{BeginSpecs}} | |||
{{Spec | Bandwidth | AC (?) to 50 MHz (−3 dB) }} | |||
{{Spec | Rise time | 7 ns }} | |||
{{Spec | Input Impedance | 170 Ω }} | |||
{{Spec | Sweep Rates | 10 ns/div to 20 μs/div}} | |||
{{Spec | Calibrator | ~25 kHz, 150 mV<sub>p-p</sub> to 50 V<sub>p-p</sub>, 4% accuracy }} | |||
{{Spec | Power consumption | 1250 W }} | |||
{{Spec | Weight | | |||
* Indicator: 76 pounds | |||
* External Power Supply: 72 pounds }} | |||
{{EndSpecs}} | |||
=== Historic Context === | === 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.) | |||
Tektronix engineer [[Frank Hood]] recollects: | Tektronix engineer [[Frank Hood]] recollects: | ||
<blockquote> | <blockquote> | ||
"A lot of progress was made in 1949 and 1950. | "A lot of progress was made in 1949 and 1950. | ||
Work was well underway by [[Logan Belleville]], [[Dick Rhiger]] and [[Howard Vollum|Howard]] | Work was well underway by [[Logan Belleville]], [[Dick Rhiger]] and [[Howard Vollum|Howard]] on the high speed scope, the 517. | ||
on the high speed scope, the 517. | |||
This used some brand new circuitry, [[distributed amplifier|distributed (or chain) amplifiers]], | This used some brand new circuitry, [[distributed amplifier|distributed (or chain) amplifiers]], using 16 to 20 tubes in each stage to get the power needed to handle the high frequencies. | ||
using 16 to 20 tubes in each stage to get the power needed to handle the high frequencies. | |||
Our best prediction at that time was that there were only about 30 to 50 people in the whole world | Our best prediction at that time was that there were only about 30 to 50 people in the whole world who had need of a scope with 60 to 100 megacycle bandwidth. | ||
who had need of a scope with 60 to 100 megacycle bandwidth. | As it turned out, when we brought out a higher speed scope, people were able to design equipment of greater bandwidth and needed even faster measuring instruments. | ||
As it turned out, when we brought out a higher speed scope, | The cycle was regenerative. Having faster, more accurate measuring tools created a demand for even more measuring tools. | ||
people were able to design equipment of greater bandwidth and needed even faster measuring instruments. | |||
The cycle was regenerative. | |||
Having faster, more accurate measuring tools created a demand for even more measuring tools. | |||
We eventually sold several thousand of this instrument." | We eventually sold several thousand of this instrument." | ||
</blockquote> | </blockquote> | ||
| Line 47: | Line 51: | ||
==Internals== | ==Internals== | ||
=== External Power Supply === | === 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; after that it is a 16-pin Jones connector. | ||
Units with serial numbers from 101 through 1739 use 12-pin Jones 2412 connectors; | ''(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]]?)'' | ||
after that it is a 16-pin Jones 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]]?)'' | |||
The voltages on the 12-pin connector are: | The voltages on the 12-pin connector are: | ||
| Line 62: | Line 63: | ||
* Pin 5: +150 V, regulated | * Pin 5: +150 V, regulated | ||
* Pin 6: Ground | * Pin 6: Ground | ||
* Pin 7: | * Pin 7: −250 V, regulated | ||
* Pin 8: +180 V, 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 provides +750 V to the indicator unit. | |||
provides +750 V to the indicator unit. The highest voltage provided by | The highest voltage provided by the 555 and 551 power supplies is +500 V. | ||
the 555 and 551 power supplies is + | Also, for example, the 517A has +180 V on pin 8 of the 16-pin connector while the 555 and 551 have -150 V on pin 8. | ||
has +180 V on pin 8 of the 16-pin connector while the 555 and 551 have | |||
-150 V on pin 8. | At serial number 1740 a [[thermal cutoff]] was added. | ||
=== 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 38 V/cm vertical deflection sensitivity when operated with 24 kV 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 0.1 V/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 4 cm deflection, a 152 V differential output swing is required. There are DC blocking capacitors at various places in the signal path. | ||
For 4 cm deflection, a 152 V differential output swing is required. There are DC blocking | The slowest sweep is 20 μs/cm. The 517 is not designed for low-frequency use. | ||
capacitors at various places in the signal path. The slowest sweep is 20 μs/cm. The 517 is | |||
not designed for low-frequency use. | |||
The vertical signal path is as follows: | The vertical signal path is as follows: | ||
| Line 92: | Line 90: | ||
* Gain Stage 3: single-ended, seven sections, distributed, [[6AK5]] pentodes | * Gain Stage 3: single-ended, seven sections, distributed, [[6AK5]] pentodes | ||
* Trig Pickoff: one common-cathode [[6CB6]] pentode | * Trig Pickoff: one common-cathode [[6CB6]] pentode | ||
* Signal Delay: 51 feet of RG63U | * Signal Delay: 51 feet of RG63U 125 Ω coaxial cable (65 ns) | ||
* Phase Splitter: single-ended in, differential out, three sections, distributed, [[6CB6]] pentode | * Phase Splitter: single-ended in, differential out, three sections, distributed, [[6CB6]] pentode | ||
* Gain Stage 4: differential, six sections, distributed, [[6CB6]] pentodes | * Gain Stage 4: differential, six sections, distributed, [[6CB6]] pentodes | ||
* Gain Stage 5: differential, twelve sections, distributed, [[6CB6]] pentodes | * Gain Stage 5: differential, twelve sections, distributed, [[6CB6]] pentodes | ||
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 from the trigger pickoff in the vertical pre-amp, or from the internal rate generator circuit. | ||
an external source, or from the trigger pickoff in the vertical pre-amp, or | The trigger amplifier circuit has five stages: | ||
from the internal rate generator circuit. The trigger amplifier circuit has | |||
five stages: | |||
* Phase Splitter: [[6J6]] dual-triode connected as a differential amplifier | * Phase Splitter: [[6J6]] dual-triode connected as a differential amplifier | ||
| Line 111: | Line 107: | ||
The 517 uses 24 kV total acceleration voltage on the CRT. | The 517 uses 24 kV total acceleration voltage on the CRT. | ||
This is generated by the [[420|Type 420]] High Voltage Power Supply subsystem in the 517. | This is generated by the [[420|Type 420]] High Voltage Power Supply subsystem in the 517. | ||
It uses a 1.8 kHz oscillator to produce the high voltage, | It uses a 1.8 kHz oscillator to produce the high voltage, unlike other Tek scopes which use HV oscillators in the ultrasonic range. | ||
unlike 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 24 kV acceleration voltage, | ||
which uses the full 24 kV acceleration voltage, | and "×2" mode, which drops the acceleration voltage to 12 kV for a doubling of the vertical sensitivity. | ||
and " | |||
The control works by switching the voltage division ratio of the feedback to the error amplifier in the HV supply. | The control works by switching the voltage division ratio of the feedback to the error amplifier in the HV supply. | ||
== CRTs Used in the 517 == | == CRTs Used in the 517 == | ||
517 units with serial numbers 101 through 925 use the [[5XP|DuMont 5XP CRT]]. | 517 units with serial numbers 101 through 925 use the [[5XP|DuMont 5XP CRT]]. | ||
Later units use a Tek-made CRT, the T517PxH/T54PxH, where "x" designates | Later units use a Tek-made CRT, the [[T517|T517PxH/T54PxH]], where "x" designates the [[phosphor]] type: 1, 2, 7, 11, or 16. | ||
the [[phosphor]] type: 1, 2, 7, 11, or 16. The 5XP used [[multi-band acceleration]] | The 5XP used [[multi-band acceleration]] and has three anode connections, at 6.6 kV, 13.3 kV, and 20 kV. | ||
and has three anode connections, at 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 24 kV total acceleration voltage. | ||
The Tek-made CRT has just one anode connection, 20 kV, | |||
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 - a support for a large electrolytic capacitor, C826, which filters probe power. | ||
(The [[437-0065-00]] carrying case also has wood parts.) | |||
== Comparison of 517 with 547 == | == Comparison of 517 with 547 == | ||
In 1965, following the introduction of the 50 MHz [[547]], the 517 was discontinued. | In 1965, following the introduction of the 50 MHz [[547]], the 517 was discontinued. | ||
The 547 uses a non-distributed solid-state vertical amplifier, | The 547 uses a non-distributed solid-state vertical amplifier, [[tunnel diodes|tunnel diode]] triggering, and a 6.5 V/cm CRT, thereby achieving good performance with lower cost, size, weight, complexity, and power consumption than the 517. | ||
[[tunnel diodes|tunnel diode]] triggering, and a 6.5 V/cm CRT, | |||
thereby achieving good performance with | |||
lower cost, size, weight, complexity, and power consumption than the 517. | |||
{| border="1" class="wikitable" style="text-align: center;" | |||
{| border="1" style="text-align: center;" | |||
|+ Comparison of 517A with 547 | |+ Comparison of 517A with 547 | ||
! scope="col" | | ! scope="col" | | ||
! scope="col" | 517A | ! scope="col" width="33%" | 517A | ||
! scope="col" | 547 with 1A1 | ! scope="col" width="33%" | 547 with 1A1 | ||
|- | |- | ||
! scope="col" | Bandwidth | ! scope="col" | Bandwidth | ||
| | | 50 MHz | ||
| | | 50 MHz | ||
|- | |- | ||
! scope="col" | Sensitivity | ! scope="col" | Sensitivity | ||
| Line 161: | Line 148: | ||
|- | |- | ||
! scope="row" | Weight | ! scope="row" | Weight | ||
| | | 148 lb / 67 kg | ||
| | | 71 lb / 32 kg | ||
|- | |- | ||
! scope="row" | Complexity | ! scope="row" | Complexity | ||
| Line 169: | Line 156: | ||
|- | |- | ||
! scope="row" | Power Consumption | ! scope="row" | Power Consumption | ||
| | | 1250 W | ||
| | | 510 W | ||
|} | |} | ||
Some 517 modification kits are listed on page 181 of the 1959 catalog. | Some 517 modification kits are listed on page 181 of the 1959 catalog. | ||
Tek sold the [[108]] pulse generator as a tool for maintaining the 517, | Tek sold the [[108]] pulse generator as a tool for maintaining the 517, since a fast scope requires a fast pulse generator to test it. | ||
since a fast scope requires a fast pulse generator to test it. | |||
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== | == Links== | ||
* [ | * [https://vintagetek.org/517-oscilloscope/ Tektronix 517] @ vintagetek.org | ||
* [ | * [https://w140.com/tektronix_milspec_high_speed_scope_OCR.pdf Final Report on Tektronix MILSPEC High Speed Scope (PDF, cleaned up and OCR)] | ||
* [ | * [https://w140.com/tektronix_milspec_high_speed_scope.pdf Final Report on Tektronix MILSPEC High Speed Scope (5MB, PDF, cleaned up)] | ||
* [ | * [https://w140.com/MILSPEC_High_Speed_Scope.pdf Final Report on Tektronix MILSPEC High Speed Scope (220MB, PDF, original)] | ||
* [ | * [https://w140.com/flynn_johnson_fast_gray_wedge.pdf Flynn and Johnson "Fast Grey Wedge Analyzer for High Input Rates"] | ||
* [https://w140.com/thomas_and_hearst-measurement_of_exploding_wire_energy.pdf Thomas and Hearst, "An Electronic Scheme for Measurement of Exploding Wire Energy"] | |||
==Pictures of 517 == | ==Pictures of 517 == | ||
| Line 230: | Line 217: | ||
B170_A.JPG| [[B170-V|B170-V 170 Ω attenuator]] | B170_A.JPG| [[B170-V|B170-V 170 Ω attenuator]] | ||
Tek 517 ad.jpg | Tek 517 ad.jpg | ||
Tek 517A ad from Electronics Magazine 1955-12.jpg | Tek 517A ad from Electronics Magazine December 1955 | |||
517a rear vert interface.jpg|Direct CRT access mod | 517a rear vert interface.jpg|Direct CRT access mod | ||
517a single sweep controls.jpg|Single-sweep mod | 517a single sweep controls.jpg|Single-sweep mod | ||
| Line 242: | Line 230: | ||
Tek517 Scope04.jpg | Tek517 Scope04.jpg | ||
Tek517 Scope05.jpg | Tek517 Scope05.jpg | ||
Tek 517 lvps internal.jpg | |||
517 PowerSupply01.jpg | 517 PowerSupply01.jpg | ||
517 Cable PS-Scope.jpg | 517 Cable PS-Scope.jpg | ||
517 Cable Conn.jpg | 517 Cable Conn.jpg | ||
517 Cable Conn2.jpg | 517 Cable Conn2.jpg | ||
Tek 517 with 5xp crt.jpg|517 with [[5XP]] CRT | |||
Tek 517 right internal 5xp.jpg|517 with [[5XP]] CRT | |||
Tek 517 early rear chassis.jpg | |||
Tek 517 early bottom.jpg | |||
Tek 517 early bottom rear.jpg | |||
Tek 517 early bottom front.jpg | |||
Tek 517 crt gun connections.jpg | |||
</gallery> | </gallery> | ||
| Line 255: | Line 250: | ||
6_57.JPG |517A with cart | 6_57.JPG |517A with cart | ||
</gallery> | </gallery> | ||
==Components== | |||
{{Parts|517}} | |||
{{Parts|517A}} | |||
[[Category:Monolithic tube scopes]] | [[Category:Monolithic tube scopes]] | ||