YOKOGAWA WT500, Руководство пользователя

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7-7
IM 760201-01E
W
aveform Display
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App
Index
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 Specification
Connector type BNC connector
Input level TTL
Minimum pulse width 1 µ s
Trigger delay time
within (1
µ
s + 3 sample intervals)
CAUTION
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
External trigger signal
External trigger
(
100 Ω
+5 V
Minimum pulse
width
Trigger delay time
When set to )
Internal trigger
EXT CLK
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.
7.5 Setting the Trigger