Agilent Technologies E1441A user service •“Burst Modes” on page, “Counted Burst Mode” on page

Burst Modulation You can configure the function generator to output a burst of waveform cycles. The function generator can produce a burst using sine, square, triangle, ramp, and arbitrary waveforms. Topics covered on burst modulation are:

•“Burst Modes” on page 33

--“Counted Burst Mode” on page 33

--“Gated Burst Mode” on page 35

•“Burst Trigger Source” on page 35

--“For Counted Burst Mode” on page 35

--“For Gated Burst Mode” on page 36

•“Burst Carrier Frequency” on page 36

•“Burst Count” on page 38

•“Burst Rate” on page 39

•“Burst Phase” on page 39

Only one modulation mode can be enabled at a time. When you enable the burst mode, the previously enabled modulation mode is turned off.

Use the following command to enable burst modulation: To ensure proper operation, you should enable the burst mode after you have set up the other modulation parameters.

BM:STATe OFFON

Burst Modes There are two major modes of burst modulation; the "counted" burst, and the "gated" burst modes. In counted mode, the length of the burst is controlled by cycle count (BM:NCYCles). In gated mode, the duration of the burst is controlled by an external "gate" signal. The BM:SOURce command selects between the two modes:

BM:SOURce	INTernal	this selects the "counted" mode
BM:SOURce	EXTernal	this selects the "gated" mode

Counted Burst Mode

A counted burst is started by a trigger signal from either an internal trigger timer (TRIG:SOUR INTernal), or an external signal

(TRIG:SOUR EXTernalTTLTRG<n>BUS). The duration of the burst is set by specifying the number of waveform cycles (BM:NCYCles).

Figure 2-3shows the operation of the counted burst mode with internal

Chapter 2 Agilent E1441A Application Information 33