Aktakom AM-1108 User Manual page 21

 Start measuring from the high range if the current can't be evaluated.
 For safety, the measuring time should be limited within 15s, while the interval should be
more than 10 min when measuring high current. If the input current is more than 10.00A,
then the inner beeper sounds constantly indicating the value surpass the range.
Measuring Frequency and Duty cycle ratio (See Figure3-13)
In voltage and current (DC mV excluded) measurement, press
frequency, duty cycle ratio, and then back to voltage (current).
Frequency  Duty cycle ratio Voltage (Current) Voltage (Current)  Frequency
Please select the proper range in voltage or current function before measuring frequency and
duty cycle ratio.
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Notice
Figure3-11.DC Current Measurement
Figure3-12.AC Current Measurement
Frequency Duty cycle ratio
Figure3-13.Frequency and Duty cycle ratio
Notice
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to display frequencyduty cycle ratiovoltage (current),