# ResistorBoxes: xRTB
xRTB is a relay switeable resistance box platform.
Design features:
- Active guarding (20fA max)
- Onboard resistor reversal switch
- Onboard heater, keep resistors ovenized
- Custom Configureable for desired resistors
- Communications:
    - GPIB
    - Manual UI
    - USB
![mainBoard](./doc-img/mainBoard.png)