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Phasor measurement unit (PMU) is an emerging technology in electric power systems which has many advantages in wide area disturbance analysis, protection and control. In order to utilize the benefits of this technology and to arrive at common way of representing, reporting and utilizing Phasor measurements, the IEEE standards committee revised the existing 1344 standard for synchrophasors and recently published "IEEE Standard for Synchrophasors for Power Systems-C37.118-2005". The new standard mandates compliance levels (level 0 and / or level 1) for the PMU under steady state conditions. This paper discusses the calibration and testing of TESLA 3000 PMU -a software module available with the TESLA disturbance fault recorder (DFR) and the challenges of testing the PMU as per the new synchrophasor standard. The possible sources of errors and the current state of the art of the calibration equipment which qualifies for PMU testing will also be discussed.