560 Series plug-in interface

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The plug-in interface of the 560-series scopes is a single 24-pin Amphenol connector per slot (horizontal/vertical).

560-series plug-ins are designed to drive the CRT's deflection plates directly. The impedance seen by the differential signal of the plug-in looking into the mainframe is typically 14.3 pF and has no resistive component. The mainframe contains trimmer capacitors to standardize this capacitance.

The deflection sensitivity of the mainframe to differential deflection signals at the plug-in connector is about 19.5 V/div for the vertical and 18.5 V/div for the horizontal plates. The sensitivity is not standardized, it depends on the CRT and high voltage. This means that when plug-ins are swapped between mainframes, they need to be recalibrated.

Pin-out

Pin Function Comment
1 6.3 VAC 6 A capacity in 561, dedicated winding per slot
2 6.3 VAC return for pin 1
3 multi-trace sync pulse 50 Ω coax between slots, center conductor on right slot, screen on left slot
4 multi-trace sync pulse 50 Ω coax between slots, screen on right slot, center conductor on left slot
5 −12.2 V ground return
6 +420 V unreg. via 2 kΩ from +300 V regulator input, regulator bypass resistor in plug-in to pin 10
7 117 VAC from mains transformer primary (power line)
8 117 VAC return for pin 8
9 chassis ground
10 +300 V reg.
11 trigger signal out (V) to pin 12 on other slot
12 trigger signal in (H) from pin 11 on other slot
13 blanking to blanking deflection plate on CRT, 560 kΩ pull-up to 125 V in 561 (NC on left slot)
14 intensifying to CRT grid circuit (NC on left slot)
15 +125 V reg.
16 −12.2 V reg.
17 −deflection plate left H on right slot, lower V on left slot
18 plug-in interconnect 50 Ω coax between slots, center conductor
19 plug-in interconnect 50 Ω coax between slots, screen
20 +210 V unreg. via 2 kΩ from +125 V regulator input, regulator bypass resistor in plug-in to pin 15
21 +deflection plate right H on right slot, upper V on left slot; ~19.5 V/div (V), 18.5 V/div (H)
22 +75 V unreg. via 2 kΩ from −100 V regulator input, regulator bypass resistor in plug-in to ground
23 −100 V reg.
24 chopped blanking to CRT cathode in left slot, NC in right slot; grounded in 1-ch amplifiers, NC in timebases

Pin group function legend

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