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The Tektronix 517 is a | {{Oscilloscope Sidebar | | ||
The 517 does not take plug-ins. | 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)] | |||
* [[Media:tek_517_calibration_guide.pdf|Tektronix 517 Calibration Guide (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]]. | |||
The 517 does not take plug-ins. | |||
There is also a 517A (1955-1965). | |||
==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.) | ||
Tektronix engineer Frank Hood recollects: | Tektronix engineer [[Frank Hood]] recollects: | ||
<blockquote> | <blockquote> | ||
"A lot of progress was made in 1949 and 1950. Work was well underway by Logan Belleville, Dick Rhiger and Howard on the high speed scope, the 517. This used some brand new circuitry, distributed (or chain) amplifiers, 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 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. 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." | "A lot of progress was made in 1949 and 1950. | ||
Work was well underway by [[Logan Belleville]], [[Dick Rhiger]] and [[Howard Vollum|Howard]] | |||
on the high speed scope, the 517. | |||
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. | |||
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. | |||
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. | |||
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." | |||
</blockquote> | </blockquote> | ||
==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. The voltages on the 12-pin connector are: | 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: | |||
* Pin 1: + | * Pin 1: +750 V, regulated | ||
* Pin 2: + | * Pin 2: +475 V, regulated | ||
* Pin 3: + | * Pin 3: +350 V, unregulated | ||
* Pin 4: + | * Pin 4: +225 V, regulated | ||
* Pin 5: + | * Pin 5: +150 V, regulated | ||
* Pin 6: Ground | * Pin 6: Ground | ||
* Pin 7: | * Pin 7: −250 V, regulated | ||
* Pin 8: + | * 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. | |||
The voltages are different. The 517's external power supply | |||
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 | |||
has +180 V on pin 8 of the 16-pin connector while the 555 and 551 have | |||
-150 V on pin 8. | |||
=== 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 | which has 38 V/cm vertical deflection sensitivity when operated with 24 kV acceleration voltage. | ||
Since the vertical sensitivity at the input connector is 0. | ''(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 | |||
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 | 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 | 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: | ||
* Optional [[B170-V]] external input attenuator | |||
* Gain Stage 1: single-ended, six sections, distributed, [[6AK5]] pentodes | * Gain Stage 1: single-ended, six sections, distributed, [[6AK5]] pentodes | ||
* Gain Stage 2: single-ended, six sections, distributed, [[6AK5]] pentodes | * Gain Stage 2: single-ended, six sections, distributed, [[6AK5]] pentodes | ||
* 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 125-ohm coaxial cable | * Signal Delay: 51 feet of RG63U 125-ohm coaxial cable (65ns) | ||
* 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 | ||
Line 45: | Line 98: | ||
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: | ||
Line 57: | Line 108: | ||
* Gain Stage 4: single-ended, common-cathode, [[6AG7]] pentode | * Gain Stage 4: single-ended, common-cathode, [[6AG7]] pentode | ||
The 517 uses | === High Voltage Power Supply === | ||
Power Supply subsystem in the 517. It uses a 1. | The 517 uses 24 kV total acceleration voltage on the CRT. | ||
other Tek scopes which use HV oscillators in the ultrasonic range | 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, | |||
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 | which uses the full 24 kV acceleration voltage, | ||
voltage to | and "X2" mode, which drops the acceleration voltage to 12 kV for a doubling of the vertical sensitivity. | ||
switching | 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 == | |||
517 units with serial numbers 101 through 925 use the [[5XP|DuMont 5XP CRT]]. | |||
Later units use a Tek-made CRT, the [[T517|T517PxH/T54PxH]], where "x" designates | |||
the [[phosphor]] type: 1, 2, 7, 11, or 16. The 5XP used [[multi-band acceleration]] | |||
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 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. | ||
Line 79: | Line 131: | ||
the probe power. | the probe power. | ||
In 1965, following the introduction of the | == Comparison of 517 with 547 == | ||
517 was discontinued. | In 1965, following the introduction of the 50 MHz [[547]], the 517 was discontinued. | ||
amplifier, [[tunnel diodes|tunnel diode]] triggering, and a 6. | 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 | 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. | ||
{| 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 108: | Line 160: | ||
|- | |- | ||
! scope="row" | Weight | ! scope="row" | Weight | ||
| | | 148 lb / 67 kg | ||
| | | 71 lb / 32 kg | ||
|- | |- | ||
! scope="row" | Complexity | ! scope="row" | Complexity | ||
Line 116: | Line 168: | ||
|- | |- | ||
! scope="row" | Power Consumption | ! scope="row" | Power Consumption | ||
| | | 1250 W | ||
| | | 510 W | ||
|} | |} | ||
Line 125: | Line 177: | ||
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. | |||
== 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/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 of 517 == | |||
<gallery> | |||
517_cat_whole.jpg|front | |||
517_cat_int_left.jpg|bottom internal | |||
517_cat_int_right.jpg|right internal | |||
517_cat_int_top.jpg|top internal | |||
517_cat_ps_int.jpg|power supply internal | |||
517 power connector.jpg|12-pin Jones socket on power supply | |||
Jones 12pin male.jpg|12-pin Jones plug | |||
Tek 517 jones plug.jpg|Original Tek 517 cable with Jones plug | |||
Jones 12m inside.jpg|12-pin Jones plug inside | |||
Tek 517 420 hv.jpg|High voltage supply | |||
Tek 517 front.jpg|Front view | |||
Tek 517 indicator jones.jpg|12-pin Jones connector on indicator unit | |||
Tek 517 left.jpg|Left internal view | |||
Tek 517 vert output.jpg|Distributed vertical output amplifier | |||
Tek 517 wood cap support.jpg|Wooden support for capacitor C826 | |||
Tek crt table.png|Tek CRT Reference Chart | |||
517 trig amp underside.jpg | |||
517 vert stages one through three.jpg | |||
517 4th vert stage.jpg | |||
517 right internals.jpg | |||
517 timing switch 2.jpg | |||
517 timing switch 1.jpg | |||
517 power test point.jpg | |||
517 hv osc.jpg | |||
Tek 517a vert pre.png | Vertical pre-amplifier circuit | |||
Tek 517a vert amp.png | Vertical amplifier circuit | |||
Tek 517a trigger amp.png | Trigger amplifier circuit | |||
Tek 517 late sweep.png | | |||
Tek 517a crt circuit.png | CRT circuit | |||
Tek 517a trigger rate gen.png | | |||
Tek 517 hvps2.png | High-voltage power supply circuit | |||
517 ps fan.jpg | |||
517 ps bottom left.jpg | |||
517 ps bottom right.jpg | |||
517 ps front left int.jpg | |||
517 ps right rear bottom.jpg | |||
517 ps bottom.jpg | |||
517 ps right int.jpg | |||
517 assembly2.jpg | |||
B170_A.JPG| [[B170-V|B170-V 170 Ω attenuator]] | |||
Tek 517 ad.jpg | |||
517a rear vert interface.jpg|Direct CRT access mod | |||
517a single sweep controls.jpg|Single-sweep mod | |||
Tek 517 735 on cart.jpg | |||
Tek 517 735 left.jpg | |||
Tek 517 735 front.jpg | |||
Tek 517 735 front upper.jpg | |||
Tek 517 735 front lower.jpg | |||
Tek517 Scope01.jpg | |||
Tek517 Scope02.jpg | |||
Tek517 Scope03.jpg | |||
Tek517 Scope04.jpg | |||
Tek517 Scope05.jpg | |||
Tek 517 lvps internal.jpg | |||
517 PowerSupply01.jpg | |||
517 Cable PS-Scope.jpg | |||
517 Cable Conn.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> | |||
==Pictures of 517A == | |||
<gallery> | <gallery> | ||
517A_1.JPG |517A Front | |||
517A_2.JPG |517A Power Supply | |||
6_57.JPG |517A with cart | |||
</gallery> | </gallery> | ||
[[Category:Monolithic tube scopes]] | |||
[[Category:Introduced in 1950]] |