Amprobe ACD-40PQ Руководство пользователя - Страница 5

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4 ) OPERATION

ACV & DCV functions

Set the slide-switch function-selector to the

position. Default at last selected function.

Press SELECT button to toggle between ACV and DCV measurement functions. There is no

LCD annunciator for DC. LCD annunciator "

" turns on to indicate AC is selected.

Line-level Frequency function

When voltage or current function is selected, press Hz button momentarily toggles to

Line-level Frequency function. Frequency trigger levels vary automatically with function

ranges.

T HD%-R Total Harmonic Distortion - RMS function (ACD-40PQ only)

THD%-R = (Total Harmonics RMS / Total RMS) x 100%

Total Harmonic Distortion - RMS (THD%-R) is the percentage ratio of the Total Harmonics

RMS value to the Total (Overall) RMS value of a voltage or current signal, and is given by

the above expression. An ideal sinusoidal waveform has a value of 0 %. A badly distorted

sinusoidal waveform may have a much higher THD%-R value of approaching one hundred

(100% is the maximum theoretical reading).

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