Draw the path from the instrument port to the DUT and mark each cable, adapter, switch state, conditioning element, probe and fixture transition. A standard calibration removes only the errors between the instrument and the plane where its standards are connected; downstream hardware remains in the result unless a different calibration or validated correction moves the plane.
A switch matrix can be included only when the routed state, unused-port condition, repeatability, isolation, level and correction data are controlled. A probe or fixture can be removed only when its electrical model matches the delivered geometry and the de-embedding method has passed an independent quality check over the required band.
State the final reported plane with a physical datum and retain the calibration, path state and fixture or probe revision. If the chain changes after calibration, measure the check standard again or recalibrate; naming the result at the DUT does not compensate for an undocumented transition.