HP 81101A Reference Manual page 39

Command
:ARM:EWID
Long
:ARM[:SEQuence[1]|STARt][:LAYer]:EWIDth[:STATe]
Form
Set & Query
Parameter
ON | OFF | 1 | 0
*RST value
OFF
Description
Use this command to enable the EXT WIDTH trigger mode available on
the M
the :ARM and :TRIG system is disabled.
In EXT WIDTH mode a signal applied to the EXT INPUT determines the
width and period of the output signal(s) from the instrument. You can
still control the edge transition times and levels of the output signal(s).
Command
:ARM:FREQ
Long
:ARM[:SEQuence[1]|STARt][:LAYer]:FREQuency[:CW][:FIXed]
Form
Set & Query
Parameter Numeric
Parameter Suffix
HZ with engineering prefixes, e.g.: MHZ is Megahertz.
*RST value
100 kHz
Specified Limits
1 mHz to 50 MHz
Description
Use this command to program the frequency of the PLL (INTernal2)
when it is used as the :ARM:SOURce for internal triggering of pulses,
bursts or patterns.
If you are using the PLL as :TRIGger:SOURce to set the pulse frequency,
use the [:SOURce]:FREQuency[:CW|:FIXed] command.
Example
To set up bursts of four 20 MHz pulses occurring at a burst rate of 2 MHz:
:TRIG:SOUR INT
:FREQ 20 MHZ
:ARM:SOUR INT2
:ARM:SENS EDGE
:ARM:FREQ 2 MHZ
:TRIG:COUNT 4
/T
. When EXT WIDTH mode is switched on, the rest of
ODE RIGGER SCREEN
Programming Reference
SCPI Instrument Command List
Select internal osc. as pulse period source
Set pulse frequency to 20 MHz
Select PLL as triggering source
Sense edge of PLL signal
Set triggering frequency to 2 MHz
Set burst length to 4
39