560: Difference between revisions

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The 560 is a scope which use 50 and 60 series plug-ins for both the vertical and horizontal deflection.  The mainframes contain no amplifier stages, requiring the plug-ins to directly drive the CRT deflection plates.  While promoted by Tek as having the advantage of “not limited by additional circuitry between the plug-in and the deflection plates”, this configuration has a significant disadvantage.  Touching up the gain or sweep cal when swapping plug-ins in scopes with amplifiers in the mainframe can be skipped, as doing so only tunes the accuracy to a small amount of additional precision.  But in the 560 series, this step is required to even get crude accuracy, as the raw deflection factor of the CRT has a relatively large range, and the mainframe has no circuitry to normalize it.
The 560 is a scope which use 50 and 60 series plug-ins  
for both the vertical and horizontal deflection.   
The mainframes contain no amplifier stages,  
requiring the plug-ins to directly drive the CRT deflection plates.   
While promoted by Tek as having the advantage of  
“not limited by additional circuitry between the plug-in and the deflection plates”,  
this configuration has a significant disadvantage.   
Touching up the gain or sweep cal when swapping plug-ins  
in scopes with amplifiers in the mainframe can be skipped,  
as doing so only tunes the accuracy to a small amount of additional precision.   
But in the 560 series, this step is required to even get crude accuracy,  
as the raw deflection factor of the CRT has a relatively large range,  
and the mainframe has no circuitry to normalize it.


Other than the CRT circuits and power supply, the only additional circuits in the 560 are a voltage /timing calibrator.  Tektronix referred to the 560 series mainframes as “indicators” rather than oscilloscopes.
Other than the CRT circuits and power supply,  
the only additional circuits in the 560 are a voltage /timing calibrator.   
Tektronix referred to the 560 series mainframes as “indicators” rather than oscilloscopes.


The 560 was introduced along with the similar 561 in 1961.  A rack model was never offer.  Both of the mainframes use conventional 5” round CRTs, with glass envelops.  The maximum system bandwidth of the 560 is 1 MHz.  The 561 also supports the 70 series plug-ins, which are not compatible with the 560.  Certain members of the 70 series vertical amplifiers give a system bandwidth in the 561 of 4 MHz.  The later 2 and 3 series plug-ins can not be used in the 560 or 561, as they consume more power.
The 560 was introduced along with the similar 561 in 1961.   
A rack model was never offer.   
Both of the mainframes use conventional 5” round CRTs, with glass envelopes.   
The maximum system bandwidth of the 560 is 1 MHz.   
The 561 also supports the 70 series plug-ins, which are not compatible with the 560.   
Certain members of the 70 series vertical amplifiers give a system bandwidth in the 561 of 4 MHz.   
The later 2 and 3 series plug-ins can not be used in the 560 or 561, as they consume more power.


The 560 and 561 were short lived, both being replaced in less than a year with the 561A, which offered several performance improvements.
The 560 and 561 were short lived,  
both being replaced in less than a year with the 561A,  
which offered several performance improvements.


[[list of manuals that are needed|Manual needed]].
[[list of manuals that are needed|Manual needed]].

Revision as of 21:13, 23 March 2012

The 560 is a scope which use 50 and 60 series plug-ins for both the vertical and horizontal deflection. The mainframes contain no amplifier stages, requiring the plug-ins to directly drive the CRT deflection plates. While promoted by Tek as having the advantage of “not limited by additional circuitry between the plug-in and the deflection plates”, this configuration has a significant disadvantage. Touching up the gain or sweep cal when swapping plug-ins in scopes with amplifiers in the mainframe can be skipped, as doing so only tunes the accuracy to a small amount of additional precision. But in the 560 series, this step is required to even get crude accuracy, as the raw deflection factor of the CRT has a relatively large range, and the mainframe has no circuitry to normalize it.

Other than the CRT circuits and power supply, the only additional circuits in the 560 are a voltage /timing calibrator. Tektronix referred to the 560 series mainframes as “indicators” rather than oscilloscopes.

The 560 was introduced along with the similar 561 in 1961. A rack model was never offer. Both of the mainframes use conventional 5” round CRTs, with glass envelopes. The maximum system bandwidth of the 560 is 1 MHz. The 561 also supports the 70 series plug-ins, which are not compatible with the 560. Certain members of the 70 series vertical amplifiers give a system bandwidth in the 561 of 4 MHz. The later 2 and 3 series plug-ins can not be used in the 560 or 561, as they consume more power.

The 560 and 561 were short lived, both being replaced in less than a year with the 561A, which offered several performance improvements.

Manual needed.

Photos needed.