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• SOUR:PULS:COUN sets the number of Pacer cycles. Specify from 1 to
8388607 cycles or specify INF for a continuous output.
• SOUR:PULS:PER sets the period of each Pacer cycle. You can specify
periods from 500ns to 8.3 seconds.
• TRIG:SOUR sets the trigger source. The Pacer signal is output whenever
the trigger event occurs (specified by the TRIG:SOUR command) and
the INIT:IMM command has been executed.
Example: Pacing an External Scanner This example paces an external scanner
connected to the mainframe’s Pacer Out port. Each negative-going transition of
the square wave advances to the next channel in the scanner’s channel list. In
this example, the Pacer outputs 10 periods of 1 second each.
ABORT Set Pacer trigger system to Idle
State
SOUR:PULS:COUN 10 Configure Pacer for 10 cycles
SOUR:PULS:PER 1 Square wave period = 1 second
TRIG:SOUR IMM Trigger Pacer (when INIT is
executed)
INIT:IMM Place Pacer in Wait for Trigger
State
Example: Continuous Pacer Out Signal This example generates a continuous
signal with a period of 250ms. The signal will begin when the trigger event
(EXT) occurs (a negative-going transition on the mainframe’s Event In
connector).
ABORT Set Pacer trigger system to Idle
State
SOUR:PULS:COUN INF Configure Pacer for continuous
output
SOUR:PULS:PER 250E-3 Square wave period = 250
milliseconds
TRIG:SOUR EXT Trigger Pacer on external signal
INIT:IMM Place Pacer in Wait for Trigger
State
Pacer Trigger States Figure 4-2 shows that the Pacer’s trigger system has an Idle State, a Wait for
Trigger State, and a Pacer Action State. When you apply power, reset the
system, or execute the ABORT command, the trigger system goes to the Idle
State. You can configure the Pacer (SOURce subsystem) and specify the trigger
source (TRIG:SOUR command) while in the Idle State. Executing the
INIT:IMM command places the Pacer in the Wait for Trigger State. Now when
the trigger event occurs, the Pacer will move to the Pacer Action State and begin
outputting the specified number of square wave cycles. Once the Pacer has
begun outputting, the trigger system returns to the Idle State.
4-2 Using the Mainframe