Agilent Technologies E1441A Internal Triggering, External Triggering Including TTLTRG lines

Internal Triggering

Internal triggering is enabled when you turn on the function generator. In this mode, the function generator uses a repetitive trigger signal that internally triggers waveform bursts or frequency sweeps. The rate at which the internal timer generates triggers is dependant on the burst rate, or sweep time set (See “Burst Rate” on page 39. and See “Sweep Time” on page 43.).

To select the internal trigger source for counted bursts, use the following commands:

SOUR:BM:STATe ON

SOUR:BM:SOURCE INTernal

TRIGGER:SOURCE INTernal

To select the internal trigger source for frequency sweeps, use the following commands:

SOUR:SWEEP:STATE ON

TRIGGER:SOURCE IMMediate

The *RST and APPLy commands automatically sets the trigger source to IMMediate.

External Triggering (Including TTLTRG lines)

In this trigger mode, the function generator will accept a hardware trigger applied to the Ext Trig terminal, or one of the VXIbus TTLTRG lines. The function generator outputs one burst or initiates one sweep each time one of these trigger inputs receives the proper polarity of signal edge (set by TRIG:SLOPE). NOTE that the default logical sense of the TTLTRG lines, as defined by the VXIbus standard, is negative true. See also“Ext

Trig / FSK / Burst Input Terminal” on page 54.

Use the following command to set the trigger source to external:

TRIGger:SOURce EXTernal

Use the following command to set the trigger source to one of the VXIbus TTLTRG lines:

TRIGger:SOURce TTLTrg<0-7>

Software (BUS) Triggering

When TRIG:SOUR is BUS, the function generator can be triggered by sending an GPIB bus trigger command. The function generator outputs one burst or initiates one sweep each time the trigger command is received.

To select the bus trigger source, send the following command.

TRIGGER:SOURCE BUS

To trigger the function generator send the *TRG (trigger) command.

You can also trigger the function generator from the GPIB interface via the

Chapter 2 Agilent E1441A Application Information 53