Brymen BM869s - Operation - VFD and Frequency; VFD ACV and Hz Operations

5
value, and is commonly used to define the dynamic range of a True RMS DMM. A
pure sinusoidal waveform has a Crest Factor of 1.4. A badly distorted sinusoidal
waveform normally has a much higher Crest Factor.
4) OPERATION
CAUTION
Before and after hazardous voltage measurements, test the voltage function on a
known source such as line voltage to determine proper meter functioning.
VFD ACV
+Hz
, VFD Hz
+ACV
functions (Model 869s only)
Press the SELECT button momentarily to toggle between the subject functions. Last
selection will be saved as power up default for repeat measurement convenience. By
default, voltage is always set at manual-range 500V to best cope with most Variable
Frequency Drives (VFD) measurements. Press the RANGE button momentarily to
select other ranges only when needed. High noise-rejection frequency measurement
algorithm and Low-pass filter circuit are permanently bundled with all the voltage and
frequency function-ranges within this rotary-switch position.
Note: Hz Input sensitivity varies automatically with voltage (current function alike)
range selected. 5V range has the highest and the 1000V range has the lowest. This
VFD function defaults at the most appropriate trigger level for Variable Frequency