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MODEL SR445A

350 MHz PREAMPLIFIER

1290-D Reamwood Avenue

Sunnyvale, California 94089

Phone: (408) 744-9040 • Fax: (408) 744-9049

email: [email protected] • www.thinkSRS.com

Copyright © 2004 by SRS, Inc.

All Rights Reserved.

Revision 1.1 (03/2006)

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Summary of Contents for SR445A

Page 1: ...MODEL SR445A 350 MHz PREAMPLIFIER...

Page 2: ...50 MHz PREAMPLIFIER 1290 D Reamwood Avenue Sunnyvale California 94089 Phone 408 744 9040 Fax 408 744 9049 email info thinkSRS com www thinkSRS com Copyright 2004 by SRS Inc All Rights Reserved Revisio...

Page 3: ...or repair this product must be returned to a Stanford Research Systems authorized service facility Contact Stanford Research Systems or an authorized representative before returning this product for...

Page 4: ......

Page 5: ...ly 1 3Vdc Brief overloads 5ns trigger a 10ms flash Operation The input impedance for each channel is 50 There is a front panel switch that allows the input resistance of Channel 1 to be set to either...

Page 6: ...ource impedance note 3 49 5 50 50 5 Linear operation 1 0 1 0 V Overload level 1 3 1 3 V Limit level 1 6 1 6 V General Number of Channels 4 Operating temperature 0 40 C Mains voltage 90 132 175 264 Vac...

Page 7: ...th High Frequency Compensation The SR445A uses an AD8009 current feedback amplifier in the output stage The gain of the amplifier is controlled by the ratio of resistors in the feedback network and th...

Page 8: ...dance load The input source to the amplifier is typically a current source such as the output from a photomultiplier and so the magnitude of the input resistance is included in the gain calibration by...

Page 9: ...and P400 for channel 4 so that the DVM indicates a resistance of 500 5 Verify that the offset was nulled by connecting the current source from the DVM to the input of the other channel and measuring a...

Page 10: ...n of 5 with an adjustable offset and adjustable high frequency response The gain of U101 is set by R115 R116 The offset adjusted by P101 and injected by R117 is nulled during calibration The high freq...

Page 11: ...l or draws current via Q500 from the positive rail so that the midpoint is at ground The 9Vdc is regulated to 5Vdc by U502 and U503 The 5Vdc power supplies are passively filtered by capacitors on the...

Page 12: ...206 10 X7R C 210 5 00472 569 4 7U T35 Cap Tantalum SMT all case sizes C 211 5 00472 569 4 7U T35 Cap Tantalum SMT all case sizes C 300 5 00299 568 1U Cap Ceramic 50V SMT 1206 10 X7R C 301 5 00299 568...

Page 13: ...BAV99 Diode D 300 3 00896 301 BAV99 Diode D 301 3 00896 301 BAV99 Diode D 302 3 00896 301 BAV99 Diode D 400 3 00896 301 BAV99 Diode D 401 3 00896 301 BAV99 Diode D 402 3 00896 301 BAV99 Diode D 600 3...

Page 14: ...4 01503 461 10K Thick Film 5 200 ppm Chip Resistor R 105 4 01021 462 100 Thin Film 1 50 ppm MELF Resistor R 106 4 01134 462 1 50K Thin Film 1 50 ppm MELF Resistor R 107 4 01021 462 100 Thin Film 1 50...

Page 15: ...ick Film 5 200 ppm Chip Resistor R 300 4 01021 462 100 Thin Film 1 50 ppm MELF Resistor R 301 4 01021 462 100 Thin Film 1 50 ppm MELF Resistor R 302 4 01447 461 47 Thick Film 5 200 ppm Chip Resistor R...

Page 16: ...tor R 424 4 01527 461 100K Thick Film 5 200 ppm Chip Resistor R 425 4 01021 462 100 Thin Film 1 50 ppm MELF Resistor R 426 4 01163 462 3 01K Thin Film 1 50 ppm MELF Resistor R 427 4 01163 462 3 01K Th...

Page 17: ...All Types Z 0 0 00240 026 4 40X3 8PF Screw Black All Types Z 0 0 00252 057 GROMMET DG532 Grommet Z 0 0 00267 052 6 1 2 22 RED Wire 22 UL1007 Z 0 0 00268 052 6 1 2 22 BL Wire 22 UL1007 Z 0 0 00330 050...

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