Making Measurements 2
Measuring Frequency
U1231A/U1232A/U1233A User’s Guide 63
Figure 2-26 Frequency definition
Figure 2-27 Frequency display
Rise Time Fall Time
+ Width – Width
Period
90%
50%
10%
• Pressing controls the input range of the primary function (voltage
or ampere) and not the frequency range.
• The frequency of the input signal is shown in the primary display, and
the bar graph does not indicate the frequency value but indicates the
voltage or ampere value of the input signal.
Observe the following measurement techniques:
• If a reading shows as 0 Hz or is unstable, the input signal may be below
or near the trigger level. You can usually correct these problems by
manually selecting a lower input range, which increases the sensitivity
of the multimeter.
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