HP 81101A Reference Manual page 36

Programming Reference
Programming the Instrument Trigger Modes
Use the :ARM subsystem to select the overall triggering mode of the
instrument (CONTINUOUS, TRIGGERED, GATED, EXT WIDTH), and the
:TRIGger subsystem to select the pulse period source, triggering and
number of pulse periods per :ARM event (BURST or PATTERN length).
Continuous
Set Continuous mode by arming the instrument from its internal
oscillator:
:ARM:SOURce IMMediate
Triggered
Set Triggered mode by arming the instrument on edges from the EXT
INPUT:
:ARM:SOURce EXTernal1 Arm from EXT INPUT
:ARM:SENSe EDGE
:ARM:SLOPe POSitive
:ARM:LEVel 1V
You can also arm the instrument from the PLL and set the frequency (or
period) of the PLL to the required triggering rate:
:ARM:SOURce INTernal2 Arm from PLL
:ARM:SENSe
:ARM:SLOPe
:ARM:FREQuency <value> Set PLL frequency
N O T E
The PLL (INTernal2) cannot be used as :ARM:SOURce (triggering rate) if
it is already being used as :TRIGger:SOURce (pulse period source).
Gated
Set Gated mode by arming the instrument on levels from the EXT INPUT:
:ARM:SOURce EXTernal1 Arm from EXT INPUT
:ARM:SENSe LEVel
:ARM:SLOPe POSitive
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Arm from internal oscillator.
Arm on edge
Arm on positive edge
Set EXT INPUT threshold
EDGE Arm on edge
POSitive Arm on positive edge
Arm on signal level
Arm on positive level