The Tektronix 285 is a power supply that allows S-50 series heads (S-50/S-52/S-54 pulse generators or S-51/S-53 trigger units) to be used as freestanding instruments instead of in an oscilloscope. The 285 provides regulated +15 V and -12.2 V to the pulse head.

Tektronix 285
Sampling head power suppply
Tektronix 285

Produced from 1969 to (?)

Manuals
(All manuals in PDF format unless noted otherwise)

The trigger signal from the head's rear connector is brought out on a BSM connector on the 285's front.

Pictures