24
Chapter 5 Operation Guide
（5）Pin 18 is the Emission Enable (EE) signal. The Emission Enable
input should be switched ON at least 5ms earlier than the Emission signal
is switched ON. After switching ON Emission Enable input, the laser starts
to consume more electrical power and emits residual optical power to the
output even when EM pin 19 is LOW (Emission). The optical power value
depends on the laser model and the operating model. High contrast option
ensures low residual optical power.
CAUTION :
◎ The EE switches ON simultaneously with the rising edge on the pin 18. If
the HIGH level was applied to the pin 18 before supplying electrical power
to PCB, the laser does not recognize that EE has ON state. In order to
enable emission the pin 18 (EE) should be dropped and set to HIGH level
again after completing of warm-up phase. If the pin 19 (EM) was also in
the HIGH state before supplying power to PCB it should be also dropped
to the LOW state at the same time.
（6）Pin 19 is the Emission Modulation (EM) control input. Use pin 10
(modulation return) as the return wire for this signal. Apply HIGH to switch
ON the Emission and LOW to switch it OFF. The laser starts to emit optical
power within specified delay after setting the pin 19 to the HIGH level and
stops emitting with specified delay after being set to the LOW level. Refer
to the laser optical specification for the laser average power rise and fall
times. Modulation with a period shorter than sum of the rise and fall times
(the laser response time) may lead to the inadequate laser power behavior
and optical over/undershoot.
CAUTION：
◎ The EE input should be switched ON at least 5ms earlier than the
Emission signal is switched ON. In case of switching ON EM while the EE is
OFF, the laser does not start to emit. In case of switching ON the EM and
later the EE, the laser starts to emit in less than 5ms after switching ON the
EE.
◎ Emission Modulation(EM) should be switches ON simultaneously with
To Next Page
Loading...
