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647: Difference between revisions
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The Tektronix 647A is a 100MHz scope that is designed to operate in a wide range of temperatures. It takes two plug-ins, one for vertical, one for horizontal/sweep. It uses 10-series and 11-series plug-ins. The plug-ins | The Tektronix 647A is a 100MHz scope that is designed to operate in a wide range of temperatures. | ||
resemble those that go in a 560-series scope, like the 3A3 and 3B2 plug-ins, but they are quite different | It takes two plug-ins, one for vertical, one for horizontal/sweep. It uses 10-series and 11-series plug-ins. The plug-ins | ||
are not at all compatible. The 647A contains vertical and horizontal amplifiers, whereas in the 560-series, | resemble those that go in a 560-series scope, like the [[3A3]] and [[3B2]] plug-ins, but they are quite different | ||
and are not at all compatible. The 647A contains vertical and horizontal amplifiers, whereas in the 560-series, | |||
the plug-ins drive the deflection plates directly. The 647A followed the Type 647, which is similar | the plug-ins drive the deflection plates directly. The 647A followed the Type 647, which is similar | ||
but has 50MHz bandwidth. There is also an RM647A. The 647 was introduced in 1963 and has 14kv of acceleration | but has 50MHz bandwidth. There is also an RM647A. The 647 was introduced in 1963 and has 14kv of acceleration | ||
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connection. This is in contrast to the 500-series scopes, which appear to | connection. This is in contrast to the 500-series scopes, which appear to | ||
the plug-in as a high impedance. For example, there is a cathode follower immediately after the | the plug-in as a high impedance. For example, there is a cathode follower immediately after the | ||
plug-in connector in a 547. Notable exceptions are the 585 and 585A, which interface the signal | plug-in connector in a [[547]]. Notable exceptions are the [[585]] and 585A, which interface the signal | ||
from plug-in to the scope at a 93-ohm impedance, like the the 647A. | from plug-in to the scope at a 93-ohm impedance, like the the 647A. Plug-ins that are compatible | ||
with the 647 and 647A include the [[10A2]] and the [[11B2]]. | |||
Is it the only scope to use those plug-ins? It is unusual to see only one scope in what appears to be the beginning of a series. Was it discontinued because of lack of demand? What replaced it? | Is it the only scope to use those plug-ins? It is unusual to see only one scope in what appears to be the beginning of a series. Was it discontinued because of lack of demand? What replaced it? | ||