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most cases, provided the driver is firmly attached to the metal laser body and the HV power
supply is attached to the same body via all available mounting holes.
If the EMI level is still very high, attempt mounting ferrites on all power and control wires
leading to the driver and power supply (except wires to the Pockels cell).
Please note that the aluminum case of the driver is not designed to provide effective EMI
shielding. Essentially, correct wiring provides best results.
For a safe start of the driver, the DC power supply must provide at least 0.6 A peak current when
turning on. Although most DC power supplies are capable of providing this, it is recommended
to double-check your supply as an insufficient peak current may damage the driver.
Set output voltage from HV supply.
If the HV power supply is manufactured by a third party, before supplying voltage, ensure there
is no overvoltage while turning it on.
If driver is fixed together with HV power supply, connect CAN cable to HV tuning port
#8
in
Figure 4
or set HV voltage by potentiometer.
It is necessary to measure the generator output voltage with a 50
W
load before applying
synchronization signals to the DPB driver. The signal voltage must be at 2…6 V level. Make sure
that the duration of SYNC IN1 pulse is longer than 30 ns in single-pulse driving, or delay between
SYNC IN1 and SYNC IN2 is greater than 30 ns in two-pulse driving. A shorter duration or delay of
the synchronization pulses may damage the driver.
After the generator output voltage is measured, remove the 50
W
load and provide
synchronization pulses to the driver.
Note that the output pulse duration and delay depend of the control pulse signal level and HV
pulse rise/fall time (edges of HV pulse); the duration may vary in the order of several
nanoseconds (in positive and negative directions). It is not recommended to use control signals
with edges longer than 10 ns.
Figure 8
presents the input circuit. Below 30 ns, driver output
voltage starts decreasing. Output pulses shorter than 30 ns can damage the driver.
Note:
After +DC voltage is applied, the first synchronization pulse is skipped.
Summary of Contents for DPB-10-4.2
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Page 16: ...12 www eksmaoptics com Figure 8 Input circuit of driver ...
