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АМM-1130
Logic Frequency/Duty Ratio Measurement
The testing chart is shown in the Figure 3-4.The frequency range is of 2.01Hz～10MHz （Vp 0.35～5V）, while the duty
ratio measurement range being of 5%～94.9%.And the measurement methods are as follows:
1. Turn on the power switch and set the rotary switch to the position
2. Insert the red testing line into the VΩHz end and the black testing line into the COM end.
3. Press the HZ/DUTY key to select the duty ratio( % ) modes.
4. Connect the red testing line to high logic level, the black one to low logic level.
5. Read the measured value from the display screen. If the frequency of the measured signal is lower than 2.01Hz, the
reading will be displayed as zero. If the amplitude of signal is too low or the low level is larger than 0.35 Volt, the
reading will also displayed as zero.
6. If the frequency of the duty ratio is lower than 5%, the reading will be displayed as UL. If the duty ratio is bigger than
95% the reading will also displayed as OL.
7. This measurement is of automatic range or manual range, it is available to press the RANGE key.
%
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Hz
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