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301/302 User Manual

continuous operating mode. When placed in trigger, gated or burst

mode, the trigger input is made active and waits for the right condition

to trigger the instrument. In trigger and burst modes, the trigger input

is edge sensitive, i.e., it senses transitions from high to low or from

low to high to trigger the Model 301/302. The direction of the transition

is programmable. In gated mode, the trigger input is level sensitive,

i.e., the Model 301/302 is gated when the logic level is high and idle

when the level is logic low. Trigger level for this input is

programmable.

The trigger input is common to both channels. Therefore, if the model

301/302 is placed in trigger mode, both channels share the same

mode and the trigger input causes both channels to start generating

waveforms at the same time.

Phase relationship between channels is tightly controlled in trigger

mode. You should expect that both channels will start generating

waveforms with exactly the same start phase. Further control over

phase offset between channels is also provided. Applying a phase

offset between the channels is described later in this manual.

AM Input –

Channel A

The channel A AM input accepts signals that amplitude modulate the

channel A signal. The Channel A AM input becomes active only when

the AM function is selected.

AM Input –

Channel B

The channel B AM input accepts signals that amplitude modulate the

channel B signal. The Channel B AM input becomes active only when

the AM function is selected.

Sample Clock Input

The external clock input is available for those applications requiring

synchronization to one sample clock source. Normally, this input is

disabled. When enabled, the clock at this input replaces the internal

clock generator and the 301/302 generates waveforms with the

sample clock at the Sample Clock input.

Operating Modes

The 301/302 can be programmed to operate in one of four operating

modes: continuous, triggered, gated and counted burst. These modes

are described below.

As was discussed above, both channels are placed simultaneously in

triggered mode. All channels will start generating waveforms when a

valid trigger signal is received at the trigger input. Both waveforms will

start and complete at exactly the same instance.

Getting Started

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