Variable-frequency drives (VFD) V & Hz measurement.
LoZ voltage measurement to drain ghost voltages.
Check 3Φ phase sequence.
Motor Inrush current measurement.
True RMS reading on AC and DC+AC mode. (3901)
uA measurement for HVAC flame sensors. (3901)
mV measurement range to interface with other accessories. (3901)
Crest Factor (C-F) & Harmonic Ratio (H-R) measurement. (3901)
Backlight LCD display . (3901)
Data hold, Auto hold & Peak hold mode.
Max/Min record mode.
Data memory & read function