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Buses are the pathways that create the connection between a drive resource and a pin in the switch matrix. Each bus forms a channel in the switch matrix. More buses enable higher level test applications such as powered curve tracing and automatic functions.
To the left, is the MT Century minus the monitor. You will see 1 test chassis (centered), 1 drive box (left), and a 950 series fixture (right).
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.
The number of buses needed on a curve tracer depends on the tests and applications you want to run. There are 3 bus configurations for all our curve tracers you can choose from 2 buses, 4 buses, and 6 buses.
2 buses are used for continuity testing using unpowered curve tracing. This means the device will be in an unpowered state as the pins are swept with voltage and their characteristics measured. If you require powered curve tracing, you will need 4 buses.
4 buses are the minimum configuration for powered curve tracing with two buses available as power supplies. This allows the device in a powered state as the pins are curve traced. The 4-bus configuration is more versatile and capable than a 2-bus configuration with the ability to connect to power supplies and perform powered and unpowered curve tracing.
A 6-bus configuration allows for powered curve tracing and provides additional two buses which are specifically intended to serve as low impedance power supply voltages. This can free up drives three and four for use as curve tracing drives, or as additional power supplies for a device with a large amount of power supply voltages. These drives can be used for curve tracing, but their accuracy is low since they are intended as power supplies.
This provides a quick summary of the capabilities of the three different bus configurations. For more detail into the buses and configurations, check out this page.