Racal Instruments 3155 Spezifikationen PDF herunterladen (Seite 70)

User Manual 3155

ArbConnection 3-17

Using the Sequence

Table

To learn more about sequences and sequence control, refer to sec-

tion 4 of this manual. The 3155 generates sequenced waveforms, but

waveforms must be loaded to the instrument from a computer before

it can generate the sequences. The waveforms are downloaded and

stored in the 3155 in “waveform memory”. Waveform memory size is

1Meg.

As was explained in Using the Segment Table above, waveform

memory can be divided into smaller segments. Up to 4096 segments

can be defined, and used as individual arbitrary waveforms. Having a

limited size of waveform memory can, for some applications, pose a

limitation. If sections of the waveform are repetitive, one may use the

sequence generator to take these segments and replay them as part

of the complete waveform without losing valuable memory space and

without scarifying waveform coherence, or integrity. The tool for us-

ing repetitive and multiple segments in one long waveform is called

the Sequence Generator. WaveCAD has a special dialog box where

sequences are designed. This tool is called the Sequence Table.

The Sequence Table is demonstrated in Figure 3-7. To access this

table click on the “To Sequence Table” button on the Arbitrary

Waveform and Sequence Panel. A description of this table is given

below.

Figure 3-36. The Sequence Table

There are four major elements that you should consider while pro-

gramming a sequence table. They are: Link#, Loop(s), Segment#

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Racal Instruments 3155 Spezifikationen Seite 70