BNC PCO-6131 Operating Manual Download Page 4

1.0  Safety 

The high-power nature of this device dictates the use of caution when operating or 

servicing this equipment. OBSERVE ALL SAFETY PRECAUTIONS LISTED 

BELOW. FAILURE TO DO SO COULD RESULT IN INJURY OR DEATH. 

Precautions: 

1. 

The Laser Diode Driver should be serviced only by personnel experienced 

in high power pulsed power systems. 

2. 

Service personnel should be instructed to observe all safety precautions 

as stated in the operating instructions, and those safety precautions standard to 

the high voltage pulsed power community. Failure to do so could result in serious 

injury. 

3. 

Do not handle the load or terminations, or remove the input or output 

cables, while the driver is in operation. Ensure that the 24 VDC power supply has 

fully discharged before handling the load. Failure to observe these precautions can 

result in potential electric shock to personnel, arcing, and damage to the 

connectors and system. 

4. 

The Laser Diode Driver contains reference planes which are elevated to 

the potential of the output pulse. Extreme caution should be exercised when 

servicing the equipment. 

5. 

The Laser Diode Driver contains electrolytic capacitors. Do not reverse the 

polarity of the input DC power supply, and do not exceed the maximum ratings for 

the support power supplies. Doing so may result in damage to the capacitors or to 

the driver, or personal injury due to venting of the capacitors. 

6. 

Pulsed power systems are capable of random triggering via transients and 

therefore when the driver is turned on, or high voltage is present in the module, 

assume it is possible to get a pulse on the output stripline. 

Berkeley Nucleonics Corporation (BNC) provides information on its products and 

associated hazards, but it assumes no responsibility for the after-sale operation 

and safety practices. 

Summary of Contents for PCO-6131

Page 1: ...PCO 6131 Laser Diode Driver Module Operating Manual...

Page 2: ...Berkeley Nucleonics Corporation 2955 Kerner Blvd San Rafael CA 94901 Tel 415 453 9955 Fax 415 453 9956 ww berkeleynucleonics com...

Page 3: ...uctions 5 5 1 Output Stripline 5 5 2 Load Interconnection 5 5 3 Gate Input 6 5 4 Enable Input 6 5 5 Output Current Setpoint Monitor 6 5 6 Internal and External Current Setpoint 7 5 7 Leading Edge Rise...

Page 4: ...e these precautions can result in potential electric shock to personnel arcing and damage to the connectors and system 4 The Laser Diode Driver contains reference planes which are elevated to the pote...

Page 5: ...age applied to the inductor is 24 Volts This results in a very fast increase in current so very short on times are necessary When the controller switches off then a very small voltage is across the in...

Page 6: ...f the pulse The rise time may be slowed down using the variable rise time control to minimize or eliminate this ringing 3 0 System Requirements The PCO 6131 requires user supplied 24 VDC support power...

Page 7: ...rolled The output pulse current may be monitor using the optional external current monitor board PCA 9155 via the cable Scaling is 1000 A V into 50 Ohms The output of this CVR has a 51 1 Ohms resistor...

Page 8: ...t may also be set by a remote analog input See Section 5 0 for more details The variable rise time is adjusted by the Rise Time potentiometer located on the edge of the smaller logic circuit board All...

Page 9: ...g via transients and therefore when the pulse generator is turned on or high voltage is present in the chassis assume it is possible to get a pulse on the output connector 5 1 Output Stripline The PCO...

Page 10: ...y any high quality low voltage pulse generator The gate signal should be connected to J2 8 using a 50 coaxial cable The shield of the coaxial cable should be connected to any one of the ground pins of...

Page 11: ...10 V Then slowly adjust the current setpoint potentiometer until the desired output current is obtained on the Output Set Point Monitor DO NOT OPERATE OR PULSE THE UNIT INTO AN OPEN OR HIGH IMPEDANCE...

Page 12: ...ted if it does not vary below 20 V or above 28 V At 125 A output the driver dissipates 75 W when enabled but not pulsing Efficiency is therefore the ratio of output power to the input power or output...

Page 13: ...using the Output Current Setpoint Monitor and the procedure detailed in steps 8 11 above turn the Current Set potentiometer fully counterclockwise to set the output current to zero 13 Enable the PCO...

Page 14: ...integral to obtaining good fidelity of current pulses The strip line shown in the figures in this note is the stripline supplied with the PCO 6131 and is available from BNC When a stripline is used a...

Page 15: ...Test Setup Figure 4 and 5 show how the output stripline was connected to the laser diode for the first set of tests In Figure 4 the stripline was intentionally separated to show connections Normally i...

Page 16: ...tion to Laser Diode Using this interconnection at 50 A output the following electrical performance was measured For all photos the top trace is the input gate to the PCO 6131 and the bottom trace is t...

Page 17: ...Time Using a Stripline Figure 8 10 Microsecond Pulse Width 550 ns Fall Time 67 ns Rise Time Using a Stripline We then connected the laser diode to the PCO 6131 output stripline using approximately 6...

Page 18: ...imately 6 Inches of Wire Using this interconnection at 50 A output the following electrical performance was measured For all photos the top trace is the input gate to the PCO 6131 and the bottom trace...

Page 19: ...fall time 7 0 Troubleshooting WARNING The module contains capacitors that are used as energy storage elements When charged these capacitors contain more than 7 joules of stored energy This is enough e...

Page 20: ...e voltage too low Input gate pulse width too short Increase width Input gate frequency too high Reduce frequency No 24 VDC input voltage Check input supply and connections Enable circuit not satisfied...

Page 21: ...y changes in the design or construction of its products at any time without incurring any obligation to make any change whatever in units previously delivered BNC s sole obligation and buyer s sole re...

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