Fluke 1736 and 1738 loggers investigate load, energy consumption and power quality in three-phase systems. Four current channels cover the three phases and neutral. They measure RMS voltage and current, power, energy, THD and harmonics through the 50th order. The 1738 adds a PQ Health overview and event waveforms; the corresponding expansion is available for the 1736. /B packages exclude current probes, while /INTL packages include four 12-inch 1500 A iFlex probes. Radio-adapter availability depends on the specific ordered package. Energy Analyze Plus provides analysis and reporting. The photograph illustrates the 1736/1738 series.