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{{Oscilloscope Sidebar | | {{Oscilloscope Sidebar | | ||
title=Tektronix 647 | | title=Tektronix 647 | | ||
summary=50 MHz | summary=50 MHz scope | | ||
image=647a_1.jpg| | image=647a_1.jpg| | ||
caption=647A front view | | caption=647A front view | | ||
Line 15: | Line 15: | ||
The '''Tektronix 647''' is a 50 MHz oscilloscope with plug-ins for both vertical and horizontal deflection. | 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 intent was to offer a higher performance scope in a small form factor, | 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]]. | roughly the size and weight of the [[560-series_scopes|560 series]]. Additionally, | ||
the 647 was promoted as “ruggedized” with an extended operating temperature range, | |||
and higher shock and vibration ratings than previous lab grade instruments. | and higher shock and vibration ratings than previous lab grade instruments. | ||
The 647 uses 10 series vertical and 11 series time base plug-ins. | The 647 uses 10 series vertical and 11 series time base plug-ins. | ||
At introduction, the [[10A2]] a dual channel 50 MHz vertical, | At introduction, the [[10A2]] a dual channel 50 MHz vertical, | ||
[[11A1]] single time base, and [[11A2]] dual time base were offered. | [[11A1]] single time base, and [[11A2]] dual time base were offered. | ||
These plug-ins are unique to the 647 and 647A. | |||
==Specifications== | ==Specifications== | ||
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sweep cal every time a plug-in was swapped. | sweep cal every time a plug-in was swapped. | ||
The 647 has a | The 647 has a 140 ns [[delay line]] between the vertical plug-in | ||
connector and the input of the vertical amplifier. | connector and the input of the vertical amplifier. | ||
The interface between the vertical plug-in and the mainframe | The interface between the vertical plug-in and the mainframe | ||
is a | is a 93 Ω controlled-impedance connection. | ||
This is in contrast to the [[500-series scopes]], | This is in contrast to the [[500-series scopes]], | ||
which appear to the plug-in as a high impedance. | which appear to the plug-in as a high impedance. | ||
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X-Y mode requires the use of the external horizontal input in an 11 series time base. | X-Y mode requires the use of the external horizontal input in an 11 series time base. | ||
The 647 uses the [[T6470]] CRT | 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: | The HV power supply contains five [[5642]] rectifier tubes: | ||
three for the +11. | three for the +11.2 kV CRT anode supply, one for the -2.2 kV CRT cathode, | ||
one for the -2. | and one for the -2.2 kV CRT grid/blanking. | ||
and one for the -2. | |||
The calibrator in the 647 is based on a 4 kHz crystal, | |||
which is divided down to 1 kHz. | |||
The calibrator in the 647 is based on a | |||
which is divided down to | |||
Its specified tolerance is +/- 1Hz. | Its specified tolerance is +/- 1Hz. | ||
==Pictures== | ==Pictures== | ||
<gallery> | <gallery> | ||
File:647a_1.jpg|647A front view | |||
File:647a_2.jpg|647A left view | |||
File:647a_4.jpg|647A right view | |||
File:647a_3.jpg|647A rear view | |||
File:Tek r647a.jpg|R647A front view | |||
File:RM647_1.JPG|RM647 front view | |||
File:Tek r647a inside.jpg|RM647 inside view | |||
File:Sideways r647a.jpg|Special R647A for US Air Force | |||
File:Sideways r647a rear.jpg|Rear panel of the Air Force R647A | |||
</gallery> | </gallery> | ||
[[Category:Introduced in 1963]] | [[Category:Introduced in 1963]] | ||
[[Category:CRT based solid-state scopes]] |