YOKOGAWA wt3000, Руководство пользователя, Страница: 190 / 384

6-9
IM 760301-01E
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App
Index
Waveform Display
Explanation
For functional details, see section 2.7.
A trigger is a cue used to display the waveform on the screen. The trigger is activated
when the specified trigger condition is met. At this point, the waveform is ready to be
displayed on the screen.
• Selecting the Trigger Mode.
Trigger mode specifies the conditions for updating the screen display. You can select
the measurement range from the following:
• Auto
Enables auto mode.
• If a trigger occurs within the timeout time (approx. 100 ms), the display is
updated using that trigger.
• If a trigger does not occur within the timeout time, the display is automatically
updated when the timeout time elapses.
• When the trigger signal period is greater than or equal to 100 ms, the two
conditions above are met alternately and the display is updated. In this happens,
use normal mode.
• Normal
Enables normal mode.
• The display is updated when the trigger occurs.
• The display is not updated if the 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.
• When Setting the Trigger Source to Ext Clk
Apply a trigger signal to the external clock input connector (EXT CLK) on the rear
panel according to the following specifications.
EXT. CLK
Item Specifications
Connector type BNC connector
Input level TTL
Minimum pulse width 1 µ s
Trigger delay time Within (1 µ s + 1 sample interval)
CAUTION
Applying a voltage outside the range of 0 to 5 V to the external clock input
connector (EXT CLK) can damage the instrument.
6.4 Setting the Trigger