Peak-Rms Mode; Line-Level Frequency (Hz) Function - Brymen BM157 User Manual

Peak-rms mode
Peak-rms compares and displays the maximum RMS value of surge voltage or
current with durations as short as 65ms. When ACV or ACA function is auto-selected or
manual-selected, press and hold Peak-rms
this mode. The annunciators "P-" "Max" turn on. APO (Auto Power Off) feature is
disabled automatically accordingly.
In ACA function, the Peak-rms mode starts at the highest 1000A (600A for model 357)
range to maximize measuring dynamic range. Before making measurement, press the
Peak-rms button momentarily again can manually select thru lower measuring
dynamic range 400.0A or 40.00A for higher measuring resolutions.

Line-level Frequency (Hz) function

When ACV or ACA function is auto-selected or manual-selected, press Hz button
momentarily toggles to Line-level Frequency (Hz) function. The Hz trigger level is
determined by the selected function-range from where the Hz function is activated.
In ACA function, activating the Hz function during significant measurements can get the
most appropriate trigger level to avoid electrical noises in most cases. Activating the Hz
function at AC 40.00A range (before making significant measurements) can get the
lowest trigger level (highest sensitivity).
button for one second or more toggles to
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