Triggering

This section describes the instrument's triggering system.

Trigger Overview

This triggering information applies to sweep and burst only. You can issue triggers for sweeps or bursts using internal triggering, external triggering, timer triggering, or manual triggering.

Trigger Sources

This triggering information applies to sweep and burst only. You must specify the source from which the instrument accepts a trigger.

Immediate Triggering

Internal trigger mode (default): instrument continuously outputs sweep or burst (as specified by sweep time or burst period).

Front Panel:
Trigger key Source IMMED softkey

SCPI:TRIGger:SOURce IMMediate

Manual Triggering

Manual trigger mode (front panel only): you manually trigger the instrument by pressing [Trigger]. The instrument initiates 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 instrument 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:
Trigger key (Trigger) Source softkey (Immed) External trigger softkey

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[1|2]: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 TIMer.

Trigger Input Signal

This rear-panel connector is used in the following modes:

Trigger Output Signal

The trigger output signal is chassis referenced, and it is physically next to the external modulation input, which is floating. Use appropriate care not to touch the two signals simultaneously as you are connecting or disconnecting these cables. De-energize connections to the instrument output before connecting or disconnecting these cables.