UNI-T UT803 Operating Manual page 42

Remarks:
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Input Impedance:
At 600mV range : Around > 3000M
At all other ranges: Around 10M
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Displays:
True RMS (applicable to the range of 10%~95%)
At 1000V range: AC peak factor 1.5.
All other ranges: AC peak factor 3.0.
Input short circuit has around less than 30 remaining digits, it will not affect accuracy.
AC+DC measurement accuracy = range's accuracy + 1%
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Model UT803: OPERATING MANUAL