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symbol and NEW FOCUS, Inc. are registered trademarks of New Focus, Inc.

Copyright 1999, New Focus, Inc. All rights reserved.

321101 Rev. B

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Summary of Contents for 3211

Page 1: ...Model 3211 User s Manual High Voltage Amplifier ...

Page 2: ...2 The symbol and NEW FOCUS Inc are registered trademarks of New Focus Inc Copyright 1999 New Focus Inc All rights reserved 321101 Rev B ...

Page 3: ...Contents Introduction Safety Operation Applications Appendix 1 Bandwidth Limitations Appendix 2 Operating Voltages Fuses Specifications Warranty Service Support 4 5 6 10 12 16 18 19 3 ...

Page 4: ...to drive capacitive loads up to 100 nF with peak voltages up to 200 V These features make the device useful for driving electro optic modula tors and piezo electric transducers For instance with the Model 400X Electro optic Phase Modula tors the Model 3211 can be used to provide a lin ear phase modulation of greater than π for fre quencies up to 1 MHz The amplifier can also pro vide output current...

Page 5: ...te unless the front panel rocker Power switch is on and the green LED light is indicated on the High Voltage On Off switch In the typical application the user may not want to use the 200 V outputs Since these outputs are turned on when the High voltage Output is en abled New Focus recommends putting dust covers over these 200 V outputs which are DC current limited to 2 mA when they are not being u...

Page 6: ...table from the front panel potentiometer and Input 1 and Input 2 come from the front panel BNC jacks The outputs consist of a high voltage output a monitor output which is high voltage output 30 or 1 5 times the sum of the inputs a 200 V DC current limited output and a 200 V DC current limited output NOTE Before connecting the AC power cable ver ify the the line voltage setting in the amplifier ag...

Page 7: ...k diagram of the Model 3211 High voltage Amplifier G DC Offset 0 G1 Input 1 G1 Input 2 G2 G2 Current Limit 200 V Out High Voltage Output Current Limit 200 V Out Monitor 200 V 200 V High Voltage On Off Switch Switch ...

Page 8: ...ge is 10 V peak NOTE OPERATING PRECAUTIONS The high voltage operational amplifier in the Model 3211 can be permanently damaged if ther mally stressed Thermal stress occurs only if the unit is operated well into its current limited mode for at least 5 10 minutes the unit is adequately protected for all other conditions To avoid the pos sibility of overheating the amplifier and reducing its lifetime...

Page 9: ...lifier Power Input 1 Input 2 High Voltage Output 200 V 200 V Monitor DC Offset High Voltage On Off Made in U S A High Voltage Amplifier NEW FOCUS Inc Mountain View California 94041 3211 Do not exceed 10 V peak on inputs Outputs Caution Up to 200 V ...

Page 10: ...eral purpose amplifier to drive any capacitive load less than 100 nF The amplifier can be used in con junction with a low voltage source to create a broad bandwidth low voltage modulator driver To prevent undesirable external signals from appearing on the High voltage Output the user should terminate any unused inputs 10 Applications ...

Page 11: ...er Sample Lock in Amplifier Function Generator 5 V V 200 V Signal Out 0 1 MHz Optically Chopped Signal Amplitude Modulator Models 1801 1811 2001 or 2001 Photoreceivers Feussner Polarizer 484X YYY Phase Modulator NEW FOCUS Inc Mountain View CA Model 3211 High voltage Amplifier Laser ...

Page 12: ...ng can limit the bandwidth even fur ther as described below Slew Rate The slew rate of the Model 3211 is at least 700 V µs Thus the maximum frequency of operation is dependent on the peak voltage With a peak voltage of 200 V the maximum frequency and therefore the largest signal bandwidth is given by Vout Vp sin 2πft dVout dt 2πfVp cos 2πft 700 V µs fmax large signal 111 106 Vp where Vp is the pea...

Page 13: ... C Therefore if the capacitive load is 100 nF 0 1 µF the maximum frequency before current limiting begins to distort a 200 V waveform is 955 Hz RC Filter The Model 3211 has an output resistance of approximately 25 Ω This resistance along with the capacitive load forms a low pass RC filter with the 3 dB point at a frequency of 1 2πRC This RC filter can limit the bandwidth performance of the Model 3...

Page 14: ...ermines the maximum bandwidth of the Model 3211 Four examples illustrating how to determine the maximum bandwidth follow Example 1 slew rate limited case Peak voltage 200 V Load capacitance 10 pF 1 Slew rate limited bandwidth 111 MHz 200 555 kHz 2 Current limited bandwidth 0 0191 10x10 12 200 9 55 MHz 3 Closed loop bandwidth 1 MHz 4 RC bandwidth 1 2π 25 10x10 12 637 MHz Therefore the maximum bandw...

Page 15: ...bandwidth 0 0191 100x10 12 100 1 91 MHz 3 Closed loop bandwidth 1 MHz 4 RC bandwidth 1 2π 25 100x10 12 63 7 MHz Therefore the maximum bandwidth is the small est of the four or 1 MHz Example 4 RC bandwidth limited case Peak voltage 1 V Load capacitance 100 nF 1 Slew rate limited bandwidth 111 MHz 1 111 MHz 2 Current limited bandwidth 0 0191 100x10 9 1 191 kHz 3 Closed loop bandwidth 1 MHz 4 RC band...

Page 16: ...age selection slot and remove the wheel from the unit 4 Turn the wheel and re insert into the module so the desired voltage is shown NOTE Do not attempt to rotate the wheel while it is still in the power entry module the wheel must be removed turned and then re inserted 5 Close the cover 6 Verify that the proper voltage is showing through the module s window The power entry module requires two 5x2...

Page 17: ...17 Fig 4 Model 3211 Amplifier voltage selection ...

Page 18: ...Rate 700 V µs Output Voltage 200 V Voltage Gain 40 Input Impedance 5 75 kΩ Output Impedance 25 Ω Max Load Capacitance 0 1 µF Max Output Current 120 mA Max Input without Damage 10 V peak Operating AC Voltage 100 120 220 or 240 V AC Specifications 18 ...

Page 19: ...ers Engineers are on duty from 8 00 5 00 PST Monday through Friday excluding holidays For quickest response ask for Technical Support and know the model number for your product Phone 408 980 8088 Fax 408 980 8883 Support is also available by email Email techsupport newfocus com We typically respond to email within one business day Service In the event that your amplifier malfunctions or becomes da...

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