Extech Instruments MultiMaster MM560A Guide de l'utilisateur télécharger pdf (Page 7)

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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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Extech Instruments MultiMaster MM560A Guide de l'utilisateur Page 7