YOKOGAWA WT500 User Manual page 199

IM 760201-01E
When Setting the Trigger Source to Ext Clk
Apply a trigger signal that meets the following specifications to the external clock input
connector (EXT CLK) on the rear panel.
EXT. CLK
Item
Connector type
Input level
Minimum pulse width
Trigger delay time
Applying a voltage outside of the range of 0 to 5 V to the external clock input
connector (EXT CLK) can damage the WT500.
Note
• The synchronized measurement slave setting and the trigger source Ext Clk setting cannot
be made at the same time because they both use the same connector (see section 12.6 for
information about synchronized measurement).
• To connect a BNC cable to the external clock input/external start signal output connector
(EXT CLK) when a GP-IB cable is connected to the GP-IB connector, first remove the GP-IB
cable. Then connect the BNC cable. Finally, reconnect the GP-IB cable.
Input Circuit for the External Trigger Signal, and Time Chart
EXT CLK
External trigger signal
Minimum pulse
External trigger
width
(
When set to )
Trigger delay time
Internal trigger
Selecting a Trigger Slope
The upwards or downwards movement of a signal is referred to as slope. When a
particular slope is used as a trigger condition, it is referred to as a trigger slope. You can
select one of the following kinds of trigger slopes.
• : A trigger occurs when the trigger source signal rises from a level lower than
the trigger level to a level higher than the trigger level (rising edge).
• : A trigger occurs when the trigger source signal falls from a level higher than
the trigger level to a level lower than the trigger level (falling edge).
• : Triggers occur on both rising and falling edges.
Specification
BNC connector
TTL
µ
1 s
µ
within (1 s + 3 sample intervals)
CAUTION
+5 V
100 Ω
7.5 Setting the Trigger
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App
Index