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{{Oscilloscope Sidebar | |||
|manufacturer=Tektronix | |||
|model=647 | |||
|series=647 | |||
|summary=50 MHz scope | |||
|image=647a_1.jpg | |||
|caption=647A front view | |||
|introduced=1963 | |||
|discontinued=1967 | |||
|designers=Oz Svehaug;Oliver Dalton;Jim Knapton; | |||
|manuals= | |||
* [[Media:070-370.pdf|Tektronix 647 Manual]] | |||
* [[Media:Tektronix RM647 schematics.pdf|Tektronix RM647 schematics]] (large format) | |||
* [[Media:Tektronix 647 tentative specifications.pdf|tentative specifications.pdf]] | |||
* [[Media:120_0332.pdf|Tektronix 647 HV transformer winding data]] | |||
* [[Media:Tek 647 notes.pdf|Type 647 Notes]] | |||
* [[Media:Tek 647a cal outline.pdf|Tektronix Type 647 and 647A Calibration Outline]] (OCR) | |||
<small> | |||
'''Alternate copies''' | |||
* [https://bama.edebris.com/download/tek/647a/tek%20647a.djvu Tektronix 647A Manual] (DjVu @ BAMA) | |||
}} | |||
The '''Tektronix 647''' is a 50 MHz oscilloscope with plug-ins for both vertical and horizontal deflection. | |||
It was introduced in late 1963, along with a minimal set of plug-ins, and replaced by the higher bandwidth [[647A]] in 1967. | |||
Except for the CRT and the rectifiers in the HV power supply, the 647 is all solid state. | |||
The | The original 647 project leader was [[Oz Svehaug]] in 1962. From 1963 onward, [[Oliver Dalton]] took over. | ||
The | The intent was to offer a higher performance scope in a small form factor, roughly the size and weight of the [[560-series_scopes|560 series]]. | ||
It was promoted as “ruggedized” with an extended operating temperature range, and higher shock and vibration ratings than previous lab grade instruments. | |||
The | The 647 uses 10 series vertical and 11 series time base plug-ins. | ||
At introduction, the [[10A2]] a dual channel 50 MHz vertical, [[11B1]] single time base, and [[11B2]] dual time base were offered. | |||
The [[10A1]] 45 MHz differential comparator was introduced in 1965, the [[10A2A]] amplifier in 1967. | |||
The 10 and 11 series plug-ins are unique to the 647 and 647A. | |||
{{BeginSpecs}} | |||
{{Spec | Bandwidth | DC to 50 MHz with [[10A2|10A2 plug-in]], 45 MHz with [[10A1]] (35 MHz at <5 mV/div) }} | |||
{{Spec | Rise time | 5.8 ns with 10A2, 7.8 ns with 10A1 (10 ns at <5 mV/div)}} | |||
{{Spec | CRT | [[T6470]], P31 std / P11 opt., 6 cm × 10 cm, 14 kV acceleration }} | |||
{{Spec | Power | 108/115/122/216/235/244 V<sub>AC</sub> ±10%,selected via primary voltage selector and voltage range selector switches, 50 Hz to 60 Hz; 185W with [[10A2]] & [[11B2]] plug-in }} | |||
{{Spec | Operating Temperature | –30 C° to +65 C°}} | |||
{{Spec | Cooling | AC Fan (only in rack variant) }} | |||
{{Spec | Thermal Protection | Automatic resetting thermal cutout, in case internal temperature exceeds safe operating level }} | |||
{{Spec | Weight | 18.4 kg (40.5 lbs) }} | |||
{{EndSpecs}} | |||
==Internals== | |||
Unlike the threaded knob used for retaining the [[letter-series and 1-series plug-ins|530/540 series plug-ins]], the 647 uses a lever-actuated cam mechanism. | |||
The single lever both engages and disengages the plug-in with a quick, smooth motion. | |||
Many users considered it to be the best plug-in retaining system Tek had ever offered. | |||
Unlike the [[560-series_scopes|560 series]] where the plug-ins directly drive the CRT deflection plates, the 647 has amplifiers for both the vertical and horizontal signals in the mainframe. | |||
In addition to supporting the higher bandwidth, the amplifiers provide a normalized gain at the plug-in interface, eliminating the need to adjust the gain or sweep cal every time a plug-in was swapped. | |||
The 647 has a 140 ns [[delay line]] between the vertical plug-in connector and the input of the vertical amplifier. | |||
The interface between the vertical plug-in and the mainframe is a 93 Ω controlled-impedance connection. | |||
This is in contrast to the [[500-series scopes]], which appear to the plug-in as a high impedance. | |||
The horizontal and vertical plug-ins are not electrically interchangeable. | |||
Only a 10 series plug-in will work in the vertical compartment, and only a 11 series time base will work in the horizontal compartment. | |||
X-Y mode requires the use of the external horizontal input in an 11 series time base. | |||
The 647 uses the [[T6470]] CRT with electromagnetic [[trace rotation]] and 14 kV total accelerating voltage. | |||
The HV power supply contains five [[5642]] rectifier tubes: three for the +11.2 kV CRT anode supply, one for the -2.2 kV CRT cathode, and one for the -2.2 kV CRT grid/blanking. | |||
The calibrator in the 647 is based on a 4 kHz crystal, which is divided down to 1 kHz ±1 Hz. | |||
The solid extender for 647 plug-ins is the [[013-077]]. | |||
==Pictures== | |||
===647=== | |||
<gallery> | |||
Tek 647 10a1 11b2.jpg | 647 with [[10A1]] and [[11B2]] | |||
Tek 647 right.jpg | 647 Right Side | |||
647 MOD165K.JPG | 647 with MOD165K | |||
</gallery> | |||
===647A=== | |||
<gallery> | |||
647a_1.jpg | 647A Front View | |||
647a_2.jpg | 647A Left View | |||
647a_4.jpg | 647A Right View | |||
647a_3.jpg | 647A Rear View | |||
Tek 647a front.jpg | 647A with [[10A1]] and [[11B2|11B2A]] | |||
Tek 647a left.jpg | 647A | |||
Tek 647a rear.jpg | 647A | |||
Tek 647a rear connections.jpg | 647A rear connections | |||
Tek 10a2a 11b2a.jpg | [[10A2 | 10A2A]] and [[11B2 | 11B2A]] in 647A | |||
Tek 647a rear2.jpg | 647A | |||
Tek 647a right internal.jpg | 647A | |||
Tek 647a left internal.jpg | 647A | |||
Tek 647a rear ps.jpg | 647A | |||
Tek 647a trace6.jpg | 647A | |||
Tek 647a trace5.jpg | 647A | |||
Tek 647a trace4.jpg | 647A | |||
Tek 647a trace3.jpg | 647A | |||
Tek 647a trace2.jpg | 647A | |||
Tek 647a trace1.jpg | 647A | |||
</gallery> | |||
===RM647=== | |||
<gallery> | |||
RM647_1.JPG | RM647 Front View | |||
Tek rm647.jpg | RM647 | |||
</gallery> | |||
==Components== | |||
{{Parts|647}} | |||
{{Parts|RM647}} | |||
[[Category:Introduced in 1963]] | |||
[[Category:647 series scopes]] |