The Keysight E1300B B-size VXI mainframe features improved dual fan cooling for support of the most demanding B-size modules, such as the E1312A. Two of its nine slots are located internally and are dedicated to housing the 2-slot E1326B multimeter.
The E1300B Mainframe features a built-in high-performance command module (functionally identical to the E1306A Command Module) with built-in GPIB interface.