The Keysight / Agilent / HP 34904A module for the 34970A/34972A Data Acquisition/Switch Unit gives you the most flexible connection path between your device under test and your test equipment, allowing different instruments to be connected to multiple points on your DUT at the same time. Rows or columns may be connected between multiple modules to build 8 x 8, 4 x 16 or larger matrices, with up to 96 crosspoints in a single frame.