8
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Chapter 5
I
MPORTANT
N
OTES
Please read these important notes before using the product!
1. Different voltages may be supplied to the driver depending on the jumper
#6
in
Figure 5
:
•
Without jumper: +15…25V
•
With jumper: +12V±0.5V
2. External triggering pulses to inputs
X1
(SYNC IN1) and
X2
(SYNC IN2) may be applied only
if high voltage and DC power are provided and turned on. When turning off the driver, first
turn off synchronization pulses, then turn off the power. Otherwise the driver may be
damaged.
Incorrect driver operation
.
SYNC IN pulses appears before HV and
24V; SYNC IN pulses continues after 24V is
switched off; HV supply gives an overshot.
Correct driver operation
Figure 6.
Driver operation chart
The DPB driver has protection against damage due above wrong SYNC IN timing. However,
this protection blocks output if HV supply is set below 0.5U
max
. If you still need to operate
below this limit, the protection can be switched off by shortening pins of jumper
#7
Figure
5
). This case HV supply voltage and following amplitude of output pulses can be reduced
down to 0 V. You should be absolutely sure that correct operation conditions as per
Figure
6
are fulfilled.
3. The output pulse is provided between
OUT+
and
OUT-
connectors. Do not connect an
oscilloscope or any other device to the OUT connector. The wire contact with the Pockels
cell must be proper in order to avoid a discharge, which may damage the driver. Do not
connect the driver without a capacitive load (4…10 pF) as this may damage the driver.
4. The pulse shape (including fronts) can be measured indirectly. On your oscilloscope, select
1 V sensitivity and the 1 M
W
input. Use isolated 1:10 oscilloscope probe for measurement.
Move the probe
slowly
and
carefully
toward the hot output wire. When the probe is ~10 mm
away from the hot output wire, the pulse shape should appear in the oscilloscope
(amplitude should be several volts). Do not place the probe too close to the hot output wire
– a discharge may start and damage the driver. This measurement method is not suitable for
measuring >500 ns pulses.
Summary of Contents for DPB-10-4.2
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Page 16: ...12 www eksmaoptics com Figure 8 Input circuit of driver ...
