Specifications

User Manual 301/302

segment is deleted, the next downloaded segment will be written on

top of the deleted one. There is danger that by using the TRAC:DEL

command often large portions of memory will remain unused. It is,

therefore, suggested that you periodically clear the entire memory and

only reload waveforms that you intend to use.

To partition the memory from the beginning, use the following

command:

TRACe:DELete: ALL

In WaveWiz use the button.

CAUTION

This command will destroy waveforms that were previously loaded

nto memory. After using this command, waveform segments will

ine-up from address 0 upwards.

Loading Arbitrary

Waveforms

There are three ways to load waveforms into the 301/302 these are

using 1) WaveWiz, 2) LabVIEW driver, or 3) Low-level programming.

When using WaveWiz, disregard most of this chapter and move on to

“Using WaveWiz to Generate Arbitrary Waveforms” as this software

does the work for you. If you write your own application or instrument

driver, use the following commands to load data into a specific

memory segment.

First, define the work area. Define the segment number and its

associated length. The segment length must be divisible by eight or an

error will occur. For example, to use segment number 8 with a

waveform length of 1048 points use this command:

TRACe:DEFine 8,1048

Next, make segment 8 the active segment. The active segment must

be selected because as waveforms are loaded, the Model 301/302

must be notified as to where to place the data it receives. Select the

active segment using the following command:

TRACe:SELect 8

The next step is to transfer data to the active segment. Data is loaded

into the Model 301/302 using high-speed binary transfer. A special

command is defined by IEEE-STD-488.2 for this purpose. High-speed

binary transfer allows any 8-bit bytes (including extended ASCII code)

to be transmitted in a message. This command is particularly useful

for sending large quantities of data. The Model 301/302 uses this

command to receive waveforms from the controller:

Configuring the Instrument