The Keysight U2901A is an accessory compatible and recommended to be used with the U2300A Series USB Modular Multifunction Data Acquisition and U2500A Series USB Modular Simultaneous Sampling Multifunction Data Acquisition. The pin-outs of the U2901A is dependent on the USB Data acquisition unit that it is working with.
68 pin connector
2 meter long SCSI cable
Pin-outs dependent on the USB Data acquisition unit that it is working with
