SR550 FET Input Preamplifier0 pages

Lock-In Preamplifier
SR550 — FET input preamplifier
· 3.6 nV/√Hz input noise
· FET input, 100 MΩ input impedance
· Gain of 1, 2, 5 or 10
· Single-ended and differential inputs
· AC coupled input
· High common mode rejection
· Powered by SRS lock-in amplifiers
The SR550 Voltage Preamplifier is designed to work with
SRS lock-in amplifiers. Preamplifiers provide gain close to
the experimental detector, before the signal-to-noise ratio is
permanently degraded by cable capacitance and pickup. The
SR550 minimizes noise and pickup in the connecting lines
and reduces measurement time in noise-limited experiments.
Power and control signals are brought from the lock-in by a
9-pin cable. The SR550 may also be operated independently
by applying appropriate biasing (±20 VDC, +5 VDC).

· SR550 ... $750 (U.S. list)

SR550 Specifications

12

Noise (nV/ √ Hz)

10

8

6

4

2

0
10

30

100

300

1K

3K

10K

30K

100K

Frequency (Hz)

SR550 noise plot

Input impedancet
100 MΩ + 25 pF
Inputst
Single-ended or differential
Maximum inputt
250 mVrms for overload
tt
100 VDC, 10 VAC damage threshold
Noise (typ.)t
3.6 nV/√Hz at 1 kHz
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4.0 nV/√Hz at 100 Hz
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13 nV/√Hz at 10 Hz
Couplingt
AC (0.016 Hz)
CMRR (1 V input)t
90 dB at 100 Hz
Gain settingst
1, 2, 5, 10 (automatically set by tt
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SR510 or SR530 lock-in)
Full-scale sensitivityt 10 nV to 200 mV
Gain accuracyt
2 % (2 Hz to 100 kHz)
Gain stabilityt
100 ppm/°C
Outputst
A (signal, 600 Ω, single-ended)
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B (shielded ground)
Maximum outputt
7 Vpp
Powert
Supplied by SR510, SR530, SR810, t
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SR830, SR850 or SR124 via
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connector cable
Mechanicalt3.0" × 1.3" × 5.1" (WHD)
Weightt1 lbs.
Warrantyt
One year parts and labor on defects
tt
in materials and workmanship

Ordering Information
SR550 t

Stanford Research Systemst
tttt

Lock-in preamplifiert

$750

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phone: (408)744-9040
www.thinkSRS.com