20
AC Clamp-on Meter Model CM 660 / CM 670 / CM 685
4.7 Frequency Measuring Using Voltage Input
20 to 4000Hz (2 ranges)
• Turn the rotary switch to the range
• Press the SELECT button to measure the frequency (
will
appear on the display)
• Insert the black lead to the black "COM" input jack and the red
lead to the red “+” input jack
• Bring the test probe tips into contact with the sample under test
• Press the SELECT button to display the voltage
Warning:
“-----” indicates that V <0.2V and F <20Hz
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