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DM-860A
11
AC Bandwith
AC bandwidth of a digital multimeter (DMM) is the range of frequencies over which AC measurements
can be made within the specified accuracy. It is the frequency response of the AC functions—not of
the frequency measurement functions. A DMM cannot accurately measure the AC value with frequency
spectrums beyond the AC bandwidth of the DMM. Therefore, wide AC bandwidth plays an impor-
tant role in high performance DMMs. Complex waveforms, noise, and distorted waveforms contain
frequency components that are much higher than the fundamental; for example, high frequency noise
on a 50/60 Hz power line.
Operation
Electric shock hazard:
Contact with live circuits could result in severe injury or death.
Self-Diagnostic Mode
The message “rE-O” may appear when the meter is turned on. This indicates that the meter is perform-
ing a routine self-diagnostic. Do not turn the meter off. Allow the diagnostic procedure to finish. If the
message “C_Er” appears on the display when the meter is turned on, some ranges may be well outside
of specification. To avoid incorrect measurements, stop using the meter and return it to Greenlee for
recalibration.
Operating Procedure
1. Refer to the Settings Table. Set the selector to the proper setting, press SELECT (when instructed to
do so), and connect the test leads to the meter.
2. Refer to “Typical Measurements” for specific measurement instructions.
3. Test the unit on a known functioning circuit or component.
•If the unit does not function as expected on a known functioning circuit, replace the battery and/
or fuses.
•If the unit still does not function as expected, call Greenlee for technical assistance
at 800-435-0786.
4. Take the reading from the circuit or component to be tested.
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