Dc Isolation Input Signals (Photo-Coupled) - Keysight E4980A User Manual

Handler Interface
Electrical Characteristics
Figure E-7 Output circuit configuration for the control output signals

DC isolation input signals (photo-coupled)

DC isolation input signals include /EXT_TRIG and /KEY_LOCK signals.
1. /EXT_TRIG signal
The trigger input limiting resistor should be set via jumper J6 depending
on the magnitude of the photocoupler anode voltage. For more
information, see
-470
The /EXT_TRIG signal (pins 12 and 13) is input to the photocoupler LED
(on the cathode side). When the signal rises from LOW to HIGH, the
instrument is triggered. The photocoupler LED (on the anode side) is
driven by either internal pull-up voltage (+5 V,+12 V) or external voltage
(EXT.DCV2).
"Setting Up the Handler Interface Board" on page
Keysight E4980A/AL User's Guide
473.