580 Series plug-in interface

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The plug-in interface of the 580-series scopes is a single 16-pin Amphenol 26-series connector.

An unusual aspect of the 580 Series plug-in interface is the transmission line termination scheme for the plug-in output signal. The output signal passes from the plug-in, through the plug-in interface connector, through the first of two distributed amplifiers in the 580-series mainframe's signal chain, and then back into the plug-in, which contains 93 Ω resistors to match the characteristic impedance of each side the balanced transmission line.

Pin Function Comment
1 −150 V R-C decoupled from mainframe
2 +100 V R-C decoupled from mainframe
3 +225 V R-C decoupled from mainframe
4 +350 V R-C decoupled from mainframe
5 6.3 VAC heater supply from dedicated winding on mains transformer
6 6.3 VAC heater supply return for pin 5
7 Alternate-trace sync pulse from timebase
8 not connected  
9 +Vertical signal input 93 Ω impedance
10 Ground  
11 −Vertical signal input 93 Ω impedance
12 117 VAC from primary side of mains transformer
13 117 VAC return for pin 12
14 +Vertical signal input return 93 Ω, terminated and biased in plug-in, galvanically connected to pin 9
15 +12.6 V from regulated heater supply  
16 −Vertical signal input return 93 Ω, terminated and biased in plug-in, galvanically connected to pin 11

Pin group function legend

 DC power and ground
 AC and heater power 
 Deflection and Trigger Signals 
 Control Signals 

Used in

Scopes:

Plugins:

Pictures