Employs high-performance fuses rated at 100 kA
Uses withstand current fuses with an arc extinguishing material for an assured prearcing time-current characteristic in the event of an excessive current.
Terminal shutters prevent erroneous insertion of test leads into current measurement terminals
If the function is switched to voltage measurement while a test lead is left inserted into a current measurement terminal, neither the fuse built into the current measurement circuit of the DMM nor the input protection circuit for voltage measurement can protect the circuits. The terminal shutters prevent the rotary switch from being moved from the current measurement function while a test lead is inserted into a current measurement terminal, thus preventing erroneous settings due to human error and ensuring the safety of the user. The terminal shutters open and close with operation of the function select (rotary) switch, so operation efficiency is not sacrificed.
AC voltage measurement method selectable between RMS value and mean value measurement (73303 Only)
You can compare the waveform of the measured AC voltage with a sine wave to check for distortion. If the measured RMS value is not equal to the measured mean value, you can conclude that the waveform deviates from the sine wave.
Duty ratio (%) measurement
Displays the duty ratio of a pulse waveform: High level period/1 cycle of waveform) x 100 = (t2/t1) x 100 [%]
Zero calibration for stray capacitance when checking capacitors (73302/03)
The stray capacitance of the instrument can be zeroed by using this function with the test leads open (only when the 10 nF range is selected).
Just removing the test leads from the measured object retains the measured value. Because the measurement is held, there is no need to operate the hold switch for each measurement, freeing both hands for performing safe and accurate measurements with the test leads