These deviations have a proportional effect on the derived measurements. The efficiency specified for the inverter is determined using a high-precision measuring process and represents the ratio of the output power to the input power during nominal conditions. These specifications are also verified by independent testing institutes.
The inverter''s measuring devices do not meet the high standards of calibrated measurement equipment. The inverter''s measuring channels may have a tolerance of up to ± 4 % for DC measurements and up to ± 3 % for AC measurements (based on the respective final value of the measurement range under nominal conditions).
The inverter''s measuring channels may have a tolerance of up to ± 4 % for DC measurements and up to ± 3 % for AC measurements (based on the respective final value of the measurement range under nominal conditions). As a result, the relative deviation may (also) be correspondingly larger if the feed-in power is low.
The full scale that can be measure is 1026 V. The measurement is done by applying a DC-Link voltage between 50 V to 1000 V. During this test, the inverter is running and the motor is disconnected, which brings a switching frequency of 16 kHz. The uncalibrated error is observed to be ±1% throughout the measurement range. Figure 16.
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