Basler raL2048-48gm User Manual download pdf (Page 130)

Acquisition Control AW00118302000

120 Basler racer GigE

Example

Assume that you are using an raL2048-48gm camera at full resolution (2048 pixels), assume that

you want to use the maximum allowed line acquisition rate (equivalent to the minimum allowed line

acquisition period), and the default value for C

Also assume that the other relevant settings are in accord with operation at 48.78 kHz.

The camera is nominally capable of 48000 line acquisitions per second (48 kHz) at full resolution.

Actually, however, it is capable of up to approximately 48780 line acquisitions per second.

Accordingly, the corresponding minimum allowed ExLSTrig signal period where overtriggering is

avoided is calculated as:

ExLSTrig signal period = 1/48780 [lines/s] = 20.5 µs.

Note that this ExLSTrig signal period equals the actual minimum allowed line acquisition period.

From condition number three follows the maximum possible exposure time that is compatible with

maximum overlap:

E = min. ExLSTrig Signal Period - F

E = 20.5 µs - 5.4 µs = 15.1 µs

Therefore, when operating the camera at a line acquisition rate of 48.78 kHz (involving maximum

overlap) and using the default value for C

the maximum possible exposure time is 15.1 µs. When

also considering the above condition number one, it follows that the exposure time can range

between 2 µs and 15.1 µs to be in accord with camera operation at a line rate of 48.78 kHz.

raL2048-

48gm

raL4096-

24gm

raL6144-

16gm

raL8192-

12gm

raL12288-

8gm

Nominal Maximum Allowed Line

Acquisition Rate

48000 lines/s 24000 lines/s 16000 lines/s 12000 lines/s 8000 lines/s

Actual Maximum Allowed Line

Acquisition Rate

48780 lines/s 24390 lines/s 16260 lines/s 12195 lines/s 8136 lines/s

Actual Minimum Allowed Line

Acquisition Period

20.5 µs 41.0 µs 61.5 µs 82.0 µs 122.9 µs

E, for F

 5.4

(This Applies When the Parame-

ter Limit is Not Removed from the

ExposureOverhead Parameter)

2.0 µs to

15.1 µs

2.0 µs to

35.6 µs

2.0 µs to

56.1 µs

2.0 µs to

76.6 µs

2.0 µs to

117.5 µs

E, for F

 3.4

(This Applies When the Parame-

ter Limit is Removed from the

ExposureOverhead Parameter)

2.0 µs to

17.1 µs

2.0 µs to

37.6 µs

2.0 µs to

58.1 µs

2.0 µs to

78.6 µs

2.0 µs to

119.5 µs

Table 11: Minimum and Maximum Allowed Exposure Times at Maximum Allowed Line Acquisition Rate and

Optimum ExposureOverlapTimeMax Parameter Value Settings

1 2 ... 125 126 127 128 129 130 131 132 133 134 135 ... 237 238

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Basler raL2048-48gm User Manual Page 130

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