Dalsa Spyder3 SG-34-04k80-00-R User Manual page 76

76

I6, for pu lse generator 1
Rescaler
The Rescaler lets you change the frequ ency of a period ic inpu t signal. You can u se the Rescaler to m u ltiply the
period 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 inpu t. The
valu e to u se d epend s on the period / 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 precision. The p ossible valu es are:
Acceptable Line rate relative to Granularity
Gran Precision
(30 ns)
0 1
1 4
2 16
3 256

The ―Min. Frequ ency‖ is a fixed m inim u m , otherw ise the incom ing signal period cou nter gets
satu rated (reach the m axim u m cou nt).

The ―Max. Freq.‖ is a recom m end ed m axim u m to get Error less than 1%.
03-032-20124-00
Minimum
Maximum Period
Period
(s) (s)
0.00000006 0.00197
0.00000024 0.00786
0.00000096 0.03146
0.00001536 0.50332
Spyder3 SG-34 GigE Vision Color Manual
Min. Max. Freq.
Frequency (ER<1%)
(Hz) (Hz)
509 333,333
127 83,333
32 20,833
2.0 1,302
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