Physical characteristics of TFTR neutral beams were measured durir^ the first tests and initial operating experience with production TFTR U. S. Common Log Pulse Ion Sources on beamlines in the TFTR experimental environment under acual user conditions. These measurements were performed with different power supply systems, controls, diagnostics, and operating methods compared to those used at LBL during the development phase. The set of diagnostics included water calorimetry, thermocouples, vacuum ionization gauges, photodiodes, neutron, gamma-ray and charged particle spectroscopy, optical multichannel analysis, charge exchange spectroscopy, Rutherford backscatter spectroscopy, and implantation/ secondary ion mass spectroscopy. These systems were used to perform complementary measurements of neutral beam species, impurities, spatial divergence, energy dispersion, pressure, and reionization. The measurements were performed either in the neutralizer region, where the beam contained both ions and neutrals, or in the region of the output neutral beam. In general, the results from each system were found to be i'i agreement with each other, and consistent with estimates made during the LBL envelopment phase. They can provide guidance for the optimization of TFTR neutral beam heating operations and the understanding of auxiliary heated TFTR plasmas.