Racal Instruments 3155 Spezifikationen PDF herunterladen (Seite 170)

User Manual 3155

Programming Reference 4-59

Downloading Ar-

bitrary Wave-

forms

There are two ways to download arbitrary waveform data points into

the memory. You can use Wave Composer utility in WaveCAD to

program segments and their size, create the waveform on the screen

and then with a click of a button, download the entire waveform to the

instrument. On the other hand, if you are writing your own applica-

tion, you’ll need to use the SendComand() and SendBlock() func-

tions. Information on these functions is given at the beginning of this

chapter. You can follow the general guidelines below to download

waveforms to the instrument. The following example assumes seg-

ment 1 having 1000 points.

1. Use the function SendCommand() to program trac:sel 1. This

command makes segment number 1 active. Anything that you

download to the 3155 is downloaded to the active segment, in

this case – segment 1.

2. Use the SendCommand() to program trac:def 1,1000. This

command defines the size of segment 1, in this case – 1000

waveform points.

3. Use the function SendBlock() to send waveform data points to

the 3155. You can use this function in two ways: 1) You can

generate and save an external file with the waveform and then

call this function with the path to your file, or 2) you can build

the data into your function, as described earlier in this chapter.

After you download the waveform data to the instrument, you’ll have

to change the waveform mode to arbitrary (USER) and set the sam-

ple clock frequency to that the output frequency meets your require-

ments. Additional information on the commands used for arbitrary

waveform management is given below.

HINT

If you use multiple segments in your application, you

can combine all segments to one long waveform and

then use trac:def n,m commands to define segments

length.

TRACe:DEFine<segment_number>,<length>

Purpose

This command defines waveform segments and their relative lengths. The use of this command is neces-

sary before downloading data using the SendBlock() function.

• <segment_number> sets the selected segment

• <length> assigns a length to the above selected segment. Minimum segment length is 16 points, the

maximum is 1Meg.

NOTE

The 3155 operates in interlaced mode where four memory cells generate one

byte of data. Therefore, segment size can be programmed in numbers evenly

divisible by four only. For example, 2096 bytes is an acceptable length for a bi-

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