GDM-8261A User Manual
128
Application: External trigger
Background
The GDM-8261A uses the internal trigger by default, for
example to count the frequency and the period. Using an
external trigger allows for customized triggering
conditions.
Signal
connection
Connect the external trigger signal to the Digital I/O
port located on the rear panel.
6
FAIL Out
7 8 9
1 2 3 4 5
High Limit FAIL Out
VCC Out
NC
PASS Out
External Trigger In
EOM Out
LOW Limit FAIL Out
Digital (chassis) Ground
Pin4
External Trigger Input pin
Connection
Pin 4
Pin 3
Trigger input
Digital I/O
Terminal
Pulse width
timing
≒
23
μs
0V
+5V
1. Activate
external trigger
Press the Shift key followed by the
Trig key. The EXT indicator appears
on the display.
EXT
/ EXIT
SHIFT
TRIG
INT/EXT
