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Berkeley Nucleonics Corporation

2955 Kerner Blvd., San Rafael, CA 94901 ° Tel (415) 453 9955 ° Fax (415) 453 9956 ° www.berkeleynucleonics.com

Figure 9 - Laser Diode Connected Using

Approximately 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 is the output current pulse measured with the PCO-6131’s current

monitor.

Figure 10 - 1 Microsecond Pulse Width – Wire Interconnection

3.8 Microsecond Fall Time, 438 ns Rise Time

Содержание PCO-6131

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

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

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...