Mikrotron MC132x Especificações descarregar pdf (Página 21)

Configuration MC132x Users Manual Rev. 0.22

6.7.3 Synchronous operation without shutter

Without electronic shutter the exposure time is 1 / frame rate.

6.7.4 Synchronous operation with shutter

In the sensor is implemented a freeze frame shutter, which allows to reduce the exposure time in steps

of one line. The minimum value of the exposure time is the duration of 2 line periods, which is deter-

mined by the value of r2 (min. 001h).

Command: :r2<x

> ... Range 001h ...3ffh

Response: none

Exposure time T

= r2 • T

-T

/ 2

... exposure time in s B

r2 ... value of register 2

... time/line

= 1/F

sens

* 136 [s]

... Time/line

sens

... sensor clock

Typical exposure times:

Sensor clock

frequency (MHz)

Time/line

(µsec)

@ 1/5.000 s

@ 1/10.000 s

66 2,06 97 49

33 4,12 49 24

13,2 10,3 19 10

6,6 20,6 10 5

Table 6.7-3

6.7.5 External synchronisation with synchronous exposure

MC132x cameras can be synchronized to an external signal that is input on the EXP (TRIG) signal. The

strobe output signal of a MC132x “master camera” can be used for that purpose.

See timing diagram:

Synchronous exposure with external synchronisation via TRIG

The cameras frame rate must be set to a frequency slightly higher than the maximum frequency of the

synchronization signal. The minimum frequency should be higher than 30Hz.

Command: :rf<0|1>

<0> ... deselect external sync signal

<1> ... select external sync signal

Response: none

Make sure that a sync signal is present on EXP/CC1 before this command is issued or the “trigger on

CC1” button is pressed on the MC13xx camera configuration tool.

The polarity of the sync signal can be selected with the _Polarity_of_EXP-signal

1 2 ... 16 17 18 19 20 21 22 23 24 25 26 ... 44 45

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