Keysight E4980A User Manual page 469

Handler Interface
Electrical Characteristics
2.
+5 V or +12 V when internal power supply is used. 
+5 V to +24 V (EXT.DCV2) when external power supply is used.
Figure E-6
signals, and
Figure E-6 Output circuit configuration for the test result output signals
Keysight E4980A/AL User's Guide
shows the output circuit configuration for the test result output
shows that for the control output signals.
Figure E-7
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