Dalsa Spyder3 SG-34 Series - Page 76

76 Spyder3 SG-34 GigE Vision Color Manual
03-032-20124-00 Teledyne DALSA
 I6, for pulse generator 1
Rescaler
The Rescaler lets you change the frequency of a periodic input signal. You can use the Rescaler to multiply the
period by up to 4096 or divide it by up to 4095.
Figure 57: Granularity
The Rescaler is defined by the following settings:
Granularity
The granularity is the number of clock cycles during which the rescaler checks for activity on its input. The
value to use depends on the period/ frequency of the input signal. If a frequency lies between two different
granularity settings, the lowest setting will yield a better precision. The possible values 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 m inimu m , otherw ise the incoming signal p eriod cou nter gets
saturated (reach the maximum count).
 The ―Max. Freq.‖ is a recomm end ed m axim u m to get Error less than 1%.
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