Brymen BM231, User Manual

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WARNING:
AutoV
mode input impedance increases abruptly from initial 2.1kΩ to a few hundred
kΩ’s on high voltage hard signals. “ LoZ ” displays on the LCD to remind the users of
being in such low impedance mode. Peak initial load current, while probing 1000VAC
for example, can be up to 673mA (1000V x 1.414 / 2.1kΩ), decreasing abruptly to
approx. 2.4mA (1000V x 1.414 / 580kΩ) within a fraction of a second.
Do not use
AutoV mode on circuits that could be damaged by such low input impedance. Instead,
use rotary selector or high input impedance voltage modes to minimize loading for
such circuits.
ACV, DCV & VFD-ACV
Press the SELECT button momentarily to select the subject functions in sequence.
Last selection will be saved as power up default for repeat measurement convenience.
Note:
VFD-ACV and the associated Hz are equipped with digital low-pass filter (DSP), and
are capable of handling VFD (Variable Frequency Drives) signals for fundamental V &
Hz readings. It also improves ACV and Hz reading stability when being used in most
noisy electrical environments.