YOKOGAWA WT500 User Manual page 38

Crest Factor (See section 4.11 for operating instructions)
Hold (See section 4.12 for operating instructions)
Single Measurement (See section 4.12 for operating instructions)
IM 760201-01E
The crest factor is defined as the ratio of the peak value of the waveform to the rms
value.
Peak value
Crest factor (CF) =
Rms value
Input signal waveform
The crest factor on the WT500 is determined by the ratio of the maximum peak value
that can be applied for rated input to the measurement range.
Peak value that can be input
Crest factor (CF) =
Measurement range
The crest factor can be set to 3 or 6. The measurable crest factor is as follows:
{measurement range × CF setting (3 or 6)}
Crest factor (CF) =
* However, the peak value of the input signal must be less than or equal to the maximum
allowable input.
If the crest factor of the measured signal is greater than the specifications of the
measurement instrument (the crest factor defined at the rated input), the signal can be
measured by setting a greater measurement range.
For example, even if CF is set to 3, measurement is possible for signals with a crest
factor greater than or equal to 5 when the measured value (rms value) is less than 60%
of the measurement range.
If the minimum effective input (1% of the measurement range) is being applied at CF = 3,
measurement for CF = 300 is possible.
The voltage range, current range, effective input range, and measurement accuracy vary
depending on the crest factor setting. For details, see chapter 14, "Specifications."
The data display of each measurement function can be held. The communication output
data while the display is held is the same as the held numeric data.
While the display is held, the signal is measured once at the set data update rate, and
then the display is re-held.
2.3 Measurement Conditions
Peak value
Rms value
Measured value (rms value)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
App
Index
2-15