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[SOURce] The System Instrument contains a Pacer which produces TTL level pulses. The
SOURCE command subsystem controls the number and period of these pulses.
The output of the Pacer is available at the rear-panel BNC connector labeled
“Pacer Out”.
Subsystem Syntax [SOURce]
:PULSe
:COUNt < count>
:COUNt? [MIN | MAX]
:PERiod < period>
:PERiod? [MIN | MAX]
:PULSe:COUNt SOURce:PULSe:COUNt < count> sets the number of Pacer pulses that are
generated when the trigger condition is satisfied.
Parameters Parameter
Name
Parameter
Type
Range of
Values
Default
Units
count numeric 1 to 8,388,607| 9.9E37|
INFinity| MIN| MAX
none
Comments • When count is set to INFinity or 9.9E37, pulses are continuous.
• Related Commands: ABORT, INIT, TRIG
• *RST Condition: SOUR:COUN 1
Example Setting the Pacer pulse count.
TRIG:SOUR HOLD trigger source is TRIG
command
SOUR:PULS:COUN 1E3 output 1000 Pacer pulses
SOUR:PULS:PER .1 S pulse period set to .1 second
INIT go to Wait For Trigger state
TRIG trigger the Pacer to output
pulses
:PULSe:COUNt? SOURce:PULSe:COUNt? [MIN | MAX] returns:
• The current count if no parameter is sent.
• The maximum allowable count if MAX is sent.
• The minimum allowable count if MIN is sent.
Example Querying the pulse count.
SOUR:PULS:COUN 1E3 output 1000 Pacer pulses
SOUR:PULS:COUN? query system for pulse count
retrieve value
[SOURce]:PULSe:COUNt
7-30 System Instrument Command Reference