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301/302 User Manual

Standard (Fixed)

Waveforms

The Model 301/302 generates waveforms from a memory that has to

be loaded before the instrument can generate waveforms. There are

a number of memory options that are available with the instrument.

Memory option must be specified at the time of purchase. Field

upgrade of memory options is not available. On power up, the

waveform memory has no specific data. The sine waveform, being the

default waveform on power on, is computed and loaded to the

waveform memory as part of the reset procedure. From this moment

on, every time that another standard waveform is selected, it is being

computed and loaded to the waveform memory.

Waveforms are written from the same start address. Therefore, every

time that a new waveform is selected, there is some minimal time for

the processor to compute and download the data to the memory.

The Model 301/302 can be programmed to output one of nine

standard waveform shapes: sine, triangle, square, pulse/ramp,

sine(x)/x pulse, gaussian pulse, rising/decaying exponential pulse,

noise and dc. There are some parameters associated with each

waveform, which modify the shape of the waveform to better suit your

needs. For example, different start phase for the sine waveform can

be programmed for each channel to create phase offsets between the

two output channels.

Arbitrary (User)

Waveforms

The arbitrary waveform memory is capable of storing one or more

user-defined waveforms. As was discussed before, and unless

ordered differently, the Model 301/302 is supplied with 4 Meg memory

banks with channels 1 and 2. With the 16 Meg option, there are up to

16 Meg points that can be allocated to one single waveform. On the

other hand, there is no need to use the entire memory for only one

waveform. The memory can be divided into smaller segments and

loaded with different waveforms. The instrument can be programmed

to output one segment at a time.

Loading data to arbitrary waveform memory can be a time-consuming

task, especially if all 16 Meg points are loaded in one shot. The Model

301/302 utilizes a DMA concept that speeds data transfer from host

computer to the instrument. In this mode, the memory bank is

disconnected from the CPU circuit and re-routed to the GPIB bus for

direct memory accessing by the host computer.

There are two separate memory banks for each channel that can be

loaded with different waveforms. Channels are not limited by the

number of segments and by the shape of the waveforms.

Getting Started

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