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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. | for the US military during 1949 and 1950. (See link below.) | ||
Tektronix engineer [[Frank Hood]] recollects: | |||
<blockquote> | |||
"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> | |||
==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 Jones | with a Jones plug on one end and a Jones socket on the other end. | ||
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; | ||
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]]?)'' | |||
* Pin 1: + | The voltages on the 12-pin connector are: | ||
* Pin 2: + | |||
* Pin 3: + | * Pin 1: +750 V, regulated | ||
* Pin 4: + | * Pin 2: +475 V, regulated | ||
* Pin 5: + | * Pin 3: +350 V, unregulated | ||
* Pin 4: +225 V, regulated | |||
* 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]]. | |||
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, | |||
which has | 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.)'' | |||
input connector to the vertical deflection plates is 380. | |||
For | Since the vertical sensitivity at the input connector is 0.1 V/cm, we can calculate that | ||
capacitors at various places in the signal path. The slowest sweep is | 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. 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 | ||
* 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 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 50: | 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. | |||
517 | The 517 has a switch on the front panel that selects between normal vertical sensitivity, | ||
which uses the full 24 kV acceleration voltage, | |||
the | and "X2" mode, which drops the acceleration voltage to 12 kV for a doubling of the vertical sensitivity. | ||
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 72: | 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 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. | |||
{| border="1" | {| border="1" class="wikitable" style="text-align: center;" | ||
|+ Comparison of | |+ Comparison of 517A with 547 | ||
! scope="col" | | ! scope="col" | | ||
! scope="col" | | ! scope="col" width="33%" | 517A | ||
! scope="col" | 547 | ! scope="col" width="33%" | 547 with 1A1 | ||
|- | |||
! scope="col" | Bandwidth | |||
| 50 MHz | |||
| 50 MHz | |||
|- | |||
! scope="col" | Sensitivity | |||
| 50 mV/cm | |||
| 50 mV/cm | |||
|- | |- | ||
! scope="row" | Cost | ! scope="row" | Cost in 1964 | ||
| $3500 || $ | | $3500 || $2475 | ||
|- | |- | ||
! scope="row" | Size | ! scope="row" | Size | ||
Line 92: | Line 160: | ||
|- | |- | ||
! scope="row" | Weight | ! scope="row" | Weight | ||
| | | 148 lb / 67 kg | ||
| | | 71 lb / 32 kg | ||
|- | |- | ||
! scope="row" | Complexity | ! scope="row" | Complexity | ||
| 130 tubes | | 130 tubes | ||
| | | 45 tubes | ||
|- | |- | ||
! scope="row" | Power Consumption | ! scope="row" | Power Consumption | ||
| | | 1250 W | ||
| | | 510 W | ||
|} | |} | ||
* [http://w140.com/ | Some 517 modification kits are listed on page 181 of the 1959 catalog. | ||
* [http://w140.com/ | |||
* [http://w140.com/ | Tek sold the [[108]] pulse generator as a tool for maintaining the 517, | ||
* [http://w140.com/ | 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.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/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"] | |||
==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]] |