Keysight E4980A - DC isolation input signals (photo-coupled)

- 470 Keysight E4980A/AL User’s Guide
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 /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).
㪼㪋㪐㪏㪇㪸㫌㪼㪈㪈㪊㪏
㪜㪋㪐㪏㪇㪘㩷㪚㫆㫄㫄㫆㫅
㪂㪌㪭
㪡㪧㪉㪄㪈 㪡㪧㪉㪄㪉 㪡㪧㪉㪄㪊
㪪㪈㪄㪍
㪂㪈㪉㪭
㪆㪩㪜㪘㪛㪰㪶㪝㪦㪩㪶㪫㪩㪠㪞㪞㪜㪩
㪆㪘㪣㪘㪩㪤
㪆㪠㪥㪛㪜㪯
㪆㪜㪦㪤
㪚㪦㪤㩷㪉
㪜㪯㪫㪅㪛㪚㪭㪉
㪟㪘㪥㪛㪣㪜㪩㩷㪠㪥㪫㪜㪩㪝㪘㪚㪜㩷㪙㪦㪘㪩㪛
㪟㪘㪥㪛㪣㪜㪩㩷㪠㪥㪫㪜㪩㪝㪘㪚㪜
㪚㪦㪥㪥㪜㪚㪫㪦㪩
㪧㪬㪣㪣㪄㪬㪧
㪩㪜㪪㪠㪪㪫㪦㪩
The trigger input limiting resistor should be set via jumper J6 depending
on the magnitude of the photocoupler anode voltage. For more
information, see “Setting Up the Handler Interface Board” on page 473.