7-4
IM 253710-01E
Explanation
Selecting the trigger source
Select the signal that is used for triggering (trigger source). Select from the following
choices.
• CH1 to CH8 : The trigger source is set to the voltage or current of the element that
has a measurement module installed. The numbers of the channels that do not
have measurement modules installed are not displayed.
• Ext : The trigger source is set to the signal that is applied to the external trigger
input connector. Edge trigger (see section 7.3) is the only trigger type that is valid.
The trigger level setting (see section 7.3) is void.
When the trigger source is set to [Ext]
Apply a signal to the external clock input connector (EXT TRIG IN) on the rear panel
that meets the following specifications
EXT TRIG IN
Item
Specification
Connector type
BNC connector
Input level
CMOS
Minimum pulse width
1
µ
s
Trigger delay time
Within (1
µ
s + 1 sample period)
CAUTION
Applying a signal to the external trigger input connector (EXT TRIG IN) that is
outside the 0 to 5 V range may damage the instrument.
Circuit diagram and timing chart of the external trigger input
External trigger signal
100
Ω
+5 V
Minimum pulse width
Trigger delay time
EXT TRIG IN
(when the slope is )
Internal trigger
7.2 Selecting the Trigger Source