Chapter 2
Theory of Operation
©
National Instruments Corporation
2-17
To rectify the problem, use ghost as illustrated in Figure 2-16.
Figure 2-16. Successive Scans Using Ghost
The shaded conversions are ghost conversions. The short arrows indicate
channel 0 samples and the long arrows indicate channel 1 samples that are
actually stored in the FIFOs.
Table 2-1 shows what the configuration memory would look like.
The symbol — indicates that ghost or last channel is absent.
Now both channel 0 and channel 1 are sampled with 50% duty cycle.
Table 2-1. Analog Input Configuration Memory
Channel
Ghost
Last Channel
0
—
—
1
—
last channel
0
ghost
—
1
ghost
last channel
0
ghost
—
1
—
last channel
0
—
—
1
ghost
last channel
0
ghost
—
1
—
last channel
0
ghost
—
1
ghost
last channel
0 1
0 1
0 1
0 1
0 1
0 1
Start
Convert
Содержание AT-AI-16XE-10
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