VFD Voltage measurement of GVDA New arrive GD169A Digital Clamp Meter True RMS:
1) Turn the knob to 
or 
， Press 
key until the "VFD" character is displayed
2) Insert red probe to “INPUT” jack, insert black probe to “COM” jack.
3) Connect the probe with voltage source or both ends of load in parallel for measurement
4) Read the measurement results on the display
WARNING
l Before use, use the meter to test the known voltage or current, and confirm that the meter is in good condition
l Pay special attention to safety when measuring high voltage to avoid electric shock or personal injury
l Please do not use VFD function to verify the presence of dangerous voltage or current, which may exceed the indicated value to avoid electric shock or personal injury.
CAUTION
l When using 
(low input impedance) measurement, the continuous measurement time cannot exceed 1 minute.
l Do not use LoZ mode to measure voltage in circuits that may be damaged by the low impedance of this mode。
