500 Series plug-in interface
The plug-in interface of the 500-series scopes is a single 16-pin Amphenol connector.
Pin-out
Pin | Function | Comment |
---|---|---|
1 | +Signal | 100 mV/cm, bias +67.5 V ±2% |
2 | Ground | |
3 | −Signal | 100 mV/cm, bias +67.5 V ±2% |
4 | Int Trig GND | 544, 546, 547, 549, 556, late 555 only |
5 | Int Trig + | 544, 546, 547, 549, 556, late 555 only |
6 | Sawtooth | 556 only, others n/c |
7 | Slave Pulse out | 547 only |
8 | Multi-trace sync | Cathode; grounded by CA, M etc. in Alt Trace mode |
9 | −150 V | min. 3.8 mA, max. 60 mA |
10 | +100 V | min. 4.5 mA, max. 50 mA |
11 | +225 V | min. 16 mA, max. 75 mA |
12 | +350 V | min. 0 mA, max. 20 mA |
13 | 6.3 VAC | plug-in AC heater supply, max. 2.8 A |
14 | 6.3 VAC | return for pin 13 |
15 | +75 V | min./max. 150 mA for DC series heaters and LV supply |
16 | Multi-trace sync | Anode |
Pin group function legend
DC power and ground AC and heater power Deflection and Trigger Signals Control Signals
Internal Trigger signal
In early 500-series systems (e.g., a Type C plug-in in a 535 mainframe), the mainframe's triggering is based on the main vertical signal (pins 1/3).
In these scopes, changing the vertical position control on the plug-in interacts with the trigger level setting if the scope is set to a DC trigger mode.
In somewhat later 500-series systems (e.g. Type 547), the plug-in (e.g. Type 1A1) provides the mainframe with a separate trigger signal on pin 5 whose DC level is not affected by the vertical position knob. In multi-trace setups, this allows consistent triggering from a specific input channel independent of which channel is currently being drawn on CRT.
For backward compatibility, the 547-era scopes have two types of INT triggering, taking the trigger signal either from the main vertical plug-in output (1/3), or the trigger output (5).
Although the Type 1A1 has two input channels, they are not identical - the pin 5 internal trigger signal is always taken from channel 1. Even later 500-series plug-ins (e.g., the Type 1A4), have a knob for the selection of which input channel's signal supplies the trigger signal. |}
Pictures
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pinout shown in 556 schematic
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pinout listed in 040-0065-00 kit docs
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pinout shown in 1A2 schematic
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Male pins on plugin
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Rear lugs on plugin