The GPIB controlled equipment in the blue rack is shared between SpinStand #1 on the left and SpinStand #2 on the right. It contains a Tektronix model 2712 spectrum analyzer, a 2 GSample/sec digitizer (RTD720A), and a high speed binary pattern generator (HFS9003). Obscured by the computer table are a stepper motor controller and several linear DC power supplies.