Trigger:delay; Trigger[:Immediate]; Trigger:source - Keysight E4980AL User Manual

SCPI Command Reference
E4980A/AL commands
Unit
Resolution
Equivalent key [System] - SYSTEM CONFIG - DATE/TIME - TIME - HOUR
[System] - SYSTEM CONFIG - DATE/TIME - TIME - MINUTE
[System] - SYSTEM CONFIG - DATE/TIME - TIME - SECOND

:TRIGger:DELay

Syntax :TRIGger:DELay <numeric>
:TRIGger:DELay?
Description Sets the step delay time.
Parameter
Range
Preset value
Unit
Resolution
Equivalent key [Meas Setup] - MEAS SETUP - STEP DLY

:TRIGger[:IMMediate]

Syntax :TRIGger[:IMMediate]
Description
Triggers the unit. (No Query)
Equivalent key [Trigger]

:TRIGger:SOURce

Syntax :TRIGger:SOURce {INTernal|HOLD|EXTernal|BUS}
:TRIGger:SOURce?
Description Selects the trigger mode.
378
<second>
seconds
1
<Numeric>
0 to 999
0
s
100 
Keysight E4980A/AL Precision LCR Meter