Basler A501k Manual do Utilizador descarregar pdf (Página 76)

Basic Operation and Features

3-26 Basler A500k

PRELIMINARY

3.3.4.2 Free-run Mode with Synchronous/Asynchronous Timing

Figure 3-21: Free-run, Programmable Mode - Exposure Start with Frame Valid High, Exposure

Stop with Frame Valid Low

The effective exposure starts while the Frame Valid signal is high and stops while the Frame Valid

signal is low. The Integrate Enabled signal is set to high while the effective exposure occurs. The

start, stop, and duration of the effective exposure are defined in the following ways (see Figure 3-

21):

• The effective exposure starts d microseconds after the fall of the internal control signal (expo-

sure start delay).

• Disregarding possible jitter, the duration of the effective exposure is defined by period p (set

by Timer 1).

• Jitter may shorten (f) or extend (g) the effective exposure, i.e.

duration of the effective exposure = (p - f ) to (p + g).

A504k/kc A503k A501k/kc

p Exposure as set by Timer 1

1 µs ... 3 µs 1.25 µs ... 3.75 µs 7.2 µs ... 20.2 µs

< 1 µs

≤ 1.25 µs

< 0.8 µs

g < 1 µs

≤ 1.25 µs

< 0.2 µs

Internal

Control

Signal

p = Timer 1

Internal Control Signal Period

Timer 2

Frame

Valid

Line

Valid

3.3 µs (A504k/kc)

3.8 µs (A503k)

20.6 µs (A501k/kc)

d = 1 µs ... 3 µs (A504k/kc)

d = 1.25 µs ... 3.75 µs (A503k)

d = 7.2 µs ... 20.2 µs (A501k/kc)

Integrate

Enabled

f =

≤

1 µs (A504k/kc)

f =

≤

1.25 µs (A503k)

f =

≤

0.8 µs (A501k/kc)

p = Timer 1

TIMING CHARTS ARE NOT DRAWN TO SCALE

g =

≤

1 µs (A504k/kc)

g =

≤

1.25 µs (A503k)

g =

≤

0.2 µs (A501k/kc)

1 2 ... 71 72 73 74 75 76 77 78 79 80 81 ... 149 150

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