On Monday, Wilmington, N.C. residents became the first Americans to enter the new, all-digital TV environment.
Nielsen also took advantage of the first analog switch-off to study how the transition to digital TV transmissions affected Nielsen’s ability to collect and identify  broadcast codes that will be used to measure viewing in an all-digital broadcast environment, Adweek and RBR.com reported Tuesday.
The test was part of Nielsen’s own efforts to prepare for the country-wide transition to digital TV in February.
In the Wilmington market, Nielsen normally uses paper diaries to measure TV viewing.  Nielsen also has …