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Spyder3 SG-34 GigE Vision Color Manual
03-032-20124-00
Teledyne DALSA
I6, for p u lse generator 1
Rescaler
The Rescaler lets you change the frequ ency of a p eriod ic inp u t signal. You can u se the Rescaler to m u ltip ly the
p eriod by u p to 4096 or d ivid e it by u p to 4095.
Figure 57: Granularity
The Rescaler is d efined by the follow ing settings:
Granularity
The granu larity is the nu m ber of clock cycles d u ring w hich the rescaler checks for activity on its inp u t. The
valu e to u se d ep end s on the p eriod / frequ ency of the inp u t signal. If a frequ ency lies betw een tw o d ifferent
granu larity settings, the low est setting w ill yield a better p recision. The p ossible valu es are:
Acceptable Line rate relative to Granularity
Gran
Precision
Minimum
Period
Maximum Period
Min.
Frequency
Max. Freq.
(ER<1%)
(30 ns)
(s)
(s)
(Hz)
(Hz)
0
1
0.00000006
0.00197
509
333,333
1
4
0.00000024
0.00786
127
83,333
2
16
0.00000096
0.03146
32
20,833
3
256
0.00001536
0.50332
2.0
1,302
The ―Min. Frequency‖ is a fixed minimum, otherw ise the incoming signal period counter gets
satu rated (reach the m axim u m cou nt).
The ―Max. Freq.‖ is a recom mended maximum to get Error less than 1%.
