ETS-Lindgren 7606 Coil Antenna/Shielded Coil - Manual (Page 37)

T RACEABILITY TO NIST
The traceability to NIST is through the mechanical measurements and
mechanical calibration of the tools used to manufacture the Model 7606. It can
be proven mathematically that for such an electrically small sensor, the
performance can be accurately calculated based on the dimensions of the
sensor. Thus, the traceability of the manufacturing tools to NIST provides
traceability of the electrical performance of the sensor to NIST.
MIL-STD-462D Method RS101 Testing | 37