Our curve tracers are configured with a different number of buses based on your test needs. The 2-bus configuration is primarily used for unpowered curve tracing. The 4-bus configuration is set up for powered and unpowered curve tracing, and IDD measurements but is limited to 1 VDD voltage. The 6-bus configuration allows easy testing of devices with 2-4 VDD voltages.
Learn more here.
Below is a diagram of a 2-bus configuration with connections to pins, cards, and fixture box.