Major tech MT785, Руководство пользователя

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5.9. Diode Test
1. Insert the black test lead banana plug into the negative COM jack
and the red test lead banana plug into the V CAP TEMP Hz Ω
positive jack
2. Turn the function switch to Ω CAP . Use the MODE
button to select the diode function if necessary (diode symbol will
appear on the LCD when in Diode test mode)
3. Touch the test probe tips to the diode or semiconductor junction
under test. Note the meter reading
4. Reverse the test lead polarity by reversing the red and black leads.
Note this reading
5. The diode or junction can be evaluated as follows:
•
If one reading displays a value (typically 0.400V to 0.900V) and
the other reading displays OL , the diode is good.
•
If both readings display OL the device is open.
• If both readings are very small or '0', the device is shorted.
5.10. THD Measurement (AC mode only)
Select the “ THD ” indicator then press the MODE key to enter the THD
mode. THD-F=RMS of Harmonics ÷ RMS of fundamental ×100%.
(harmonics up to the 50th)
5.11. Individual Harmonic Measurement (AC mode only)
Select the “ “ indicator then press the mode key to enter the
individual harmonic mode. Select the “Hn “ indicator then press the
and key to enter the individual harmonic mode. Hn=
RMS of
Individual Harmonic ÷ RMS of fundamental ×100%.
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