Campbell CR800 Specifiche Scaricare il pdf (Pagina 140)

Section 6. Data Table Declarations and Output Processing Instructions

6-22

The source value may be the result of a measurement or calculation. Each time

the data table with the Level Crossing instruction is called, the source is

checked to see if its value has changed from the previous value and if in any

change it has crossed any of the specified crossing levels. The instruction can

be programmed to count crossings on either the rising edge (source changes

from less than the level to greater than the level) or on the falling edge (source

changes from greater than the level to less than the level).

0.5

1.5

2.5

3.5

0123456

FIGURE 6.4-1. Example Crossing Data

As an example of the level crossing algorithm, assume we have a one

dimension 3 bin level crossing histogram (the second dimension =1) and are

counting crossings on the rising edge. The crossing levels are 1, 1.5, and 3.

Figure 6.4-1 shows some example data. Going through the data point by point:

Point Source Action Bin 1

(level=1

)

Bin 2

(level=1.5)

Bin 3

(level=3)

1 0.5 First value, no

counts

0 0 0

2 1.2 Add one count to

first bin, the

signal crossed 1

1 0 0

3 1.4 No levels crossed,

no counts

1 0 0

4 0.3 Crossed a level

but was falling

edge, no counts

1 0 0

5 3.3 Add one count to

first, second, and

third bins, the

signal crossed 1,

1.5 and 3.

2 1 1

1 2 ... 135 136 137 138 139 140 141 142 143 144 145 ... 323 324

Commenti su questo manuale

Nessun commento

Campbell CR800 Specifiche Pagina 140

Commenti su questo manuale

Prodotti e manuali riguardandi Misurazione, test & controllo Campbell CR800