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SRS Labs SR554 manual

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Table of contents for the manual

  • Page 1

    Model SR554 Transformer Preamplifier[...]

  • Page 2

    [...]

  • Page 3

    Model SR554 Transformer Preamplifier 1290-D Reamwood Avenue Sunnyvale, California 94089 Phone: (408) 744-9040 • Fax: (408) 744-90 49 email: info@thinkSRS.com • www.thinkSRS.com Copyright © 1999 by SRS, Inc. All Rights Reserve d. Revision 1.2 (07/2004)[...]

  • Page 4

    [...]

  • Page 5

    1 SR554 SPECIFICATIONS Inputs Single ended or differential Input Impedance 0.5 Ω Maximum Inputs Transformer and Buffer: 14.0 mV RMS (±20 mV peak) Transformer only: 350 mV RMS (±0.5 V peak) Common Mode Range: ± 100 VDC Rejection: 140 dB @ 100 Hz Isolation > 40dB DC to 500 MHz Input Noise 120 pV/ √ Hz @ 10 Hz (typical) (Transformer and Buff[...]

  • Page 6

    2[...]

  • Page 7

    3 OPERATION The SR554 Transformer Preamplifier is designed to be used with all SRS Lock-in amplifiers. It can reduce input noise of a lock-in amplifier dramatically (as low as 100 pV/ √ Hz) and extends the lock-in’s full scale sensitivity (without expand). It also nearly eliminates noise radiated back from the lock-in amplifier to the users exp[...]

  • Page 8

    4 1.6 µ F. The real portion of the input impedance (0.5 Ω ) determines the noise performance. See page 7 for detailed information on input impedance. The input can be floated up to ±100 VDC with respect to the chassis. The maximum AC input before overload is 14 mV RMS (±20 mV peak) when the unit is in the buffered mode. In either mode, the inp[...]

  • Page 9

    5 the differential mode. In differential operation the (A) and (B) center conductors carry the signal and shielded preamp ground, and the shields are tied to the SR554 chassis. The (A) and (B) cables should be twisted together to prevent inductive pick-up. For most experiments it is preferable to use the SR554 in the buffered mode. If the preamplif[...]

  • Page 10

    6 EXTRA LOW NOISE MEASUREM ENTS When making extremely low noise measurements, it is a good practice to connect the grounding plug of the SR554 to a ground point near the experiment. If a good ground is not available near the experiment, connect a wire from the lock- in chassis (using a lug under one of the chassis screws) to the grounding lug of th[...]

  • Page 11

    7 USING THE SR554 WITHOUT AN SRS LOCK-IN The SR554 can be powered with an external power supply. Power is applied through the 9 pin connector as described below. PIN VOLTAGE CURRENT 1 +20 V 100 mA 6 -20 V 100 mA 7,8 Ground Both voltages are required. Pins 7 and 8 should be tied together and grounded. All other pins should be left open. COMMON MODE [...]

  • Page 12

    8[...]

  • Page 13

    9 PERFORMANCE TESTS Performance tests are designed to verify that the unit is performing within the specifications. Necessary Equipment: 1. Lock-In Amplifier Freq Range 0.1 Hz - 100 kHz Output Ampl 4 mV rms - 1 Vrms Output Z 50 Ω Recommended SRS SR850/830/810 2. 50 Ω  Terminator 3. 50 Ω , 20 dB Attenuator The instructions here apply to SRS[...]

  • Page 14

    10[...]

  • Page 15

    Part List 11 Ref. SRS part Value Description C 101 5-00254-501 130P Capacitor, Ceramic Di sc, 50V, 10%, SL C 102 5-00023-529 .1U Cap, Monolythic Ceramic, 50V, 20%, Z5U C 103 5-00023-529 .1U Cap, Monolythic Ceramic, 50V, 20%, Z5U C 104 5-00005-501 150P Capacitor, Ceramic Di sc, 50V, 10%, SL C 105 5-00023-529 .1U Cap, Monolythic Ceramic, 50V, 20%, Z5[...]

  • Page 16

    Part List 12 Ref. SRS part Value Description Z 0 0-00043-011 4-40 KEP Nut, Kep Z 0 0-00079-031 4-40X3/16 M/F Standoff Z 0 0-00089-033 4" Tie Z 0 0-00128-053 4" #24 Wire #24 UL1007 Strip 1/4x1/4 Tin Z 0 0-00150-026 4-40X1/4PF Screw, Black, All Types Z 0 0-00187-021 4-40X1/4PP Screw, Panhead Phillips Z 0 0-00208-020 4-40X3/8P F Screw, Flath[...]