10
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Chapter 6
Q
UICK
S
TART
G
UIDE
This step describes the commutation jumper marked “
#5
”in
Figure 5
/
Table 4
The DPB series driver may be controlled by one or two SYNC IN signals (see
Figure 7
), depending
on the jumper position:
•
Jumper position
1
: 1-input control mode
SYNC IN1 rising edge turns HV to Pockels cell on, falling edge turns the voltage off.
•
Jumper position
2
: 2-input control mode
SYNC IN1 rising edge turns voltage on, SYNC IN2 rising edge turns the voltage off.
Either of the two jumper positions must be selected when operating the driver. Do not leave the
driver with no position set on the jumper.
Cables from generator must be of equal length for control by two synchronization pulses.
Figure 7.
Control timing for 1-input (left) and 2-input (right) controlled driver
The wires leading from outputs
OUT1
and
OUT2
to the Pockels cell must be about 0.24 mm
2
CSA.
Both the wires must be as short as possible and equal length. The length of each wire must be
not exceeding 100 mm. They should be located at least 5 mm away from any conductive
material (including the operator’s fingers and instruments) – this is done to avoid any additional
capacitive load. Otherwise, driver characteristics may degrade and/or the driver may get
damaged.
The driver output of several kilovolts (kV) with very fast edges is a powerful source of
electromagnetic interference (EMI). Please ensure proper wiring and grounding to avoid
problems caused by interference.
The best solution to minimize EMI is to mount the driver and the HV power supply on the metal
body of the laser. The driver base plate must have very good contact with the ground wire of the
HV power supply, such as the four mounting holes on the edges of the board. This is enough in
Summary of Contents for DPB-10-4.2
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