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2
Making Measurements
Measuring Frequency
Measuring Frequency
Your tester allows simultaneous monitoring of real- time voltage with
frequency measurements. To measure frequency, rotate the switch to
measure voltage (see
Press
Never measure the frequency where the voltage level exceeds the specified range.
WA R N I N G
Manually set the voltage range if you want to measure frequencies below 20 Hz.
• Pressing
N O T E
• To obtain the best measuring results for frequency measurements, please use the AC
Frequency measurement techniques
• Measuring the frequency of a signal helps detect the presence of
• Frequency is the number of cycles a signal completes each second.
• The tester measures the frequency of a voltage signal by counting the
• If a reading shows as 0 Hz or is unstable, the input signal may be
44
. Probe the test points, and read the display.
controls the input range of the voltage function and not the frequency
range.
measuring path.
harmonic currents in neutral conductors and determines whether these
neutral currents are the result of unbalanced phases or non- linear
loads.
Frequency is defined as 1/Period. Period is defined as the time between
the middle threshold crossings of two consecutive, like- polarity edges,
as shown in
Figure 2-
number of times the signal crosses a threshold level within a specified
period of time.
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 tester.
Figure 2-
6) and set up the tester accordingly.
7.
U1452A/U1452AT/U1451A User's Guide
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