User Manual
CHAPTER 4. MEASUREMENT SETUP 20
4.2 Measurement interval
The measurement interval is the time during which data is taken. The fundamental frequency of the measured
signals restricts the measurement intervals that yield meaningful results. For example, measuring 10Hz with an
interval of less than the 0.5s setting will not yield stable results. The unit needs a number of cycles to be
present to determine the frequency, and measurement intervals are not synchronized to the input.
Note: The scope timing parameters do not control the measurement interval.
• A cycle is determined by detecting zero crossings.
• Either positive, or negative going transitions of the synchronization source determine the measurement
timing. If the zero crossings do not occur within the set update interval, the entire interval is used for
calculating the various measurements. See Figure 4.1.
The choice of rising or falling transition is determined as that which gives the greatest amount of time.
• For peak value measurements (Ipk+, Upk-, etc…), the entire update interval is used. Measurements of
Crest Factor, as it is the Peak to RMS ratio, are also determined using the entire measurement update
interval.
• The input signal used as the synchronization source is congurable, and determines the synchronization
with the zero point of that input signal. The overall interval of the voltage, current or data updating cycle
may be selected as the synchronization source.
Figure 4.1: Measurement Timing
The data updating cycle refers to the cycle used for calculating sam-
pling data of the measurement function. It is identical to the set
value of the data updating rate.
The slope refers to signal changes from low level to high level (rising
edge) or from high level to low level (descending edge).
4.3 Filter and Crest Factor Setting
1. Select Menu → SET UP → OTHER SET and enter the OTHER conguration page.
2. Press to select the parameter to be congured (blue font background), and then press the soft key
corresponding to the parameter on the right to set the required value, as shown in the Figure 4.3.
3. Press the Enter key to save the settings.