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13.3 Setting the Measurement Conditions
13-10
Note
•
Set the synchronization signal to a signal with the same period as the source signal of cycle-
by-cycle measurement. Selecting an input signal with little distortion for the PLL source
allows stable cycle-by-cycle measurement. If the synchronization source waveform is
distorted and the fundamental frequency cannot be measured, correct measurement results
will not be obtained.
•
If the amplitude level of the signal applied to the element specified as the synchronization
source is small with respect to the range, the fundamental frequency cannot be measured.
Consequently, correct measurement results will not be obtained.
•
The synchronization source set according to the procedure in this section is specific to
cycle-by-cycle measurement mode. It is functionally different from the synchronization
source in other measurement modes such as normal measurement mode (see section 4.7
in the User's Manual IM WT3001E-01EN). The two settings are independent.
• Synchronization Source Slope
Set the synchronization source slope of cycle-by-cycle measurement. You can select
the slope from below.
•
: Detects the zero-crossing (boundary of the measurement period) of cycle-by-
cycle measurement when the synchronization source signal changes from
negative to positive (rising edge).
•
: Detects the zero-crossing (boundary of the measurement period) of cycle-by-
cycle measurement when the synchronization source signal changes from
positive to negative (falling edge).
• Selecting the Trigger Mode
Trigger mode defines the condition for starting the cycle-by-cycle measurement. You
can select the mode from below.
• Auto
Enables auto mode.
• If a trigger occurs within the trigger timeout value (approx. 100 ms), the cycle-by-
cycle measurement is started on that trigger.
• If a trigger does not occur within the trigger timeout value, the cycle-by-cycle
measurement is automatically started when the timeout value elapses.
Note
If the period of the trigger is greater than or equal to 100 ms, use normal mode. If you select
auto mode when the period of the trigger signal is greater than or equal to 100 ms, a timeout
may occur before the trigger is activated. Consequently, the cycle-by-cycle measurement may
not start on the specified trigger conditions.
• Normal
Enables normal mode.
• Starts the cycle-by-cycle measurement when a trigger occurs.
• The cycle-by-cycle measurement does not start if a trigger does not occur.
• Selecting the Trigger Source
Select the target to which the trigger condition is applied (trigger source) from below.
The selectable items vary depending on the installed elements.
U1, I1, U2, I2, U3, I3, U4, I4, and Ext Clk (external clock)*
* If the trigger source is set to Ext Clk, apply a signal according to the following specifications.
If the trigger source is set to Ext Clk, the trigger level settings are void.
IM WT3001E-51EN
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