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Note: Line Level Frequency measuring function input sensitivity varies automatically
with voltage (or current) function range selected. The lower the measuring range the
higher the sensitivity. That is, mV function has the highest and the 1000V range has
the lowest as in voltage function ranges. It is recommended to first measure the signal
voltage (or current) level then activate the Hz function in that voltage (or current) range
to automatically get the most appropriate trigger level. When activated from voltage
function, you can also press the RANGE button momentarily to select another trigger
level range manually. The analog bargraph pointer will point at the selected trigger
level range scale 1, 2, 3, or 4. If the Hz reading is unstable, select lower sensitivity to
avoid electrical noise. If the reading shows zero, select higher sensitivity.
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