EZ Digital DM-330SRS, Руководство по эксплуатации

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Figure 5-8. Measuring Frequency
Measuring Frequency (DM-332, 334)
APPLICATIONS
MEASURING FREQUENCY
17
0.000
In the frequency count mode, the frequency display auto-
range to one of five range : 99.99 , 9.999 , 99.99 ,
999.9 for frequencies above 10 , the update rate slows
and follows the input signal. For frequencies below 1 , the
display shows 0.000 for frequencies measurements.
Turn the rotary switch to the frequency range setting,
connect the meter to the signal being measured, connecting
the meter to the signal will normally allow the meter to auto-
range to an appropriate range.
But the minimum input signal required to trigger the
frequency counter varies, depending on the range and
frequency.
If the input signal is below the trigger level, frequency
measurements will not be taken.
If your readings are unstable, the input signal may be near
the trigger level for that range.