# ResistorBoxes: xRTB
xRTB is a relay switeable resistance box platform.

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Design features:
- +- 12V max
- USB power
    - ultrahigh isolation for active guard
- I2C environmental sensor
- Active guarding (20fA max)
- Onboard resistor reversal switch
- Onboard heater, keep resistors ovenized
- Custom Configureable for desired resistors
- Communications:
    - GPIB
    - Manual UI
    - USB
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![mainBoard](./doc-img/mainBoard.png)