Synrad p250, User Manual, Page: 43 / 106

OPERATION MODES PAGE | 43
As shown in the following figures, at low frequencies (approximately 1 kHz or less) and low duty cycles
(approximately 20%), the p250 delivers maximum peak output power and energy while providing full
depth of modulation (where the output rises from zero power to peak power on each pulse).
As illustrated in the following figure, the p250 laser delivering full peak power (approximately 800 W)
and peak pulse energy (at the maximum 1000
μ
s pulse width) with 100% depth of modulation. The
leading edge of the output energy pulse reaches full peak power and then drops off slightly as the tube
gain diminishes due to plasma heating.
Figure 4-4 PWM command signal wave form.
Important Note: If you are not using a DC supply recommended by NOVANTA, we highly recom-
mend installing a DC power supply with remote sense capability that can compensate for a
minimum load lead loss (round-trip) of 1.0 V.
Caution: Possible Equipment Damage
Hazardous DC voltages exist on DC power supply output terminals when the power supply is
energized. Contacting energized terminals may result in serious personal injury or death. Protect all
48 VDC connections from incidental contact in accordance with local, state, and national code
requirements for electrical insulation and labeling.
All AC input wiring and fusing to the DC power supply must be sized and connected in accordance
with applicable local, state, and National Electrical Code (NEC) requirements. Local, state, and
national code requirements supersede any recommendations provided in this manual. Do not plug
and unplug the DC Power cable on the rear of the laser to switch DC power to the laser. Switching
power under load causes arcing that will damage the connector and laser control board. To properly
cycle power to the laser, switch the AC power source controlling the PS-48/4000 DC power supply.
Do not plug and unplug the DC Power cable on the rear of the laser to switch DC power to the laser.
Switching power under load causes arcing that will damage the connector and laser control board.
To properly cycle power to the laser, switch the AC power source controlling the PS-48/4000 DC
power supply. Do not reverse polarity when connecting the DC Power cable to your DC power
source. Reversed DC polarity may damage the laser’s internal RF power supply.
Carefully follow directions in the Operator’s Manual to ensure that DC Power cable leads are properly
connected to the correct DC output terminals.