GW Instek GDM-8251, User Manual

Page: 41 / 59

SCANNER (OPTIONAL)
81
Use external trigger
Background
GDM-8200 series uses the internal trigger by default.
Using an external trigger allows customized triggering.
Signal
connection
Connect the external trigger signal to the Digital I/O
port located on the rear panel.
DB-9, female
Digital I/O pin
assignment
1 2 3 4 5
6 7 8 9
FAIL Out
HIGH Limit FAIL Out
LOW Limit FAIL Out
EOM Out
VCC Out
NC
COM
External Trigger In
PASS Out
Pin4
External Trigger Input pin
Activate external
trigger
Press the Shift key followed by the
TRIG key. The EXT indicator
appears on the display.
Start trigger
Press the TRIG key to start
triggering manually. The reading
indicator ( ) turns On.
Reading indicator
The reading indicator stays On before triggering.
After triggering, the indicator flashes according to the
external signal trigger timing.
Exit external
trigger
Press the Shift key followed by the
TRIG key. The EXT indicator
disappears and the trigger goes back
to the internal mode.
GDM-8200 Series User Manual
82
Run Scan
Overview
Scan operation
type Scan
Measures all specified channel range at
each trigger event. Timer setting (page77)
applies between each scan.
Step
Measures a single channel in the specified
range at each trigger event. Timer setting
(page77) applies between each channel.
Monitor
Continuously measure one channel.
Run Scan/Step
Activate
Scan/Step
1. Press the Shift key followed by
the ACV key (SCAN) or DCV
key (Step).
2. The STO indicator turns On. The Scan (Step) starts
running and the data is recorded. After running the
predefined count, the Scan (Step) stops running.
Abort Scan/Step
To abort Scan/Step or to go back to
the normal display, press the Shift
key followed by the ACV key (Scan)
or DCV key (Step) again.
Reactivate
Scan/Step
To run the Scan (Step) again, press
the TRIG key. The previous data is
overwritten by the new Scan.