Agilent Technologies E1301B, E1300B Abort, Sourpulscoun INF, Sourpulsper 250E-3, Trigsour EXT

•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