Agilent Technologies Agilent 33500 Series, Operating And Service Manual

Page: 105 / 429

Triggering
Front-Panel:
SCPI: TRIGger:SOURce IMMediate
Manual Triggering
Manual trigger mode (front panel only): you manually trigger the instrument by pressing Trigger . The instrument ini-
tiates one sweep or burst for each time you press Trigger . The button is lit when you are in the trigger menu and the
instrument is waiting for a manual trigger. The button blinks when the instrument is waiting for a manual trigger, but
you are not in the trigger menu. The key is disabled when the instrument is in remote.
External Triggering
In external trigger mode, the instrument accepts a hardware trigger at the rear-panel Ext Trig connector. The instru-
ment initiates one sweep or burst each time Ext Trig receives a TTL pulse with the specified edge. The external trigger
mode is like the manual trigger mode except that you apply the trigger to the
Ext Trig connector.
See Trigger Input Signal , below.
Front-Panel:
To specify whether the instrument triggers on a rising or falling edge, press Trigger Setup and select the edge direction
by pressing Slope.
SCPI:
TRIGger:SOURce EXTernal
TRIGger:SLOPe {POSitive|NEGative}
Software (Bus) Triggering
Available only from remote interface, this is similar to manual trigger mode from the front panel, but you trigger the
instrument with a bus trigger command. The instrument initiates one sweep or outputs one burst each time a bus
trigger command is received. The key blinks when a bus trigger command is received.
To select the bus trigger source, send TRIGger:SOURce BUS .
To trigger instrument from remote interface (GPIB, USB, or LAN) when Bus source is selected, send TRIG or *TRG
(trigger). The front-panel Trigger key is illuminated when the instrument is waiting for a bus trigger.
Timer Triggering
The timer trigger mode issues triggers a fixed period apart. To select the bus trigger source, send TRIGger:SOURce TIM .
104 Agilent 33500 Series Operating and Service Guide