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SR552 - BJT Input Preamplifier

SR552 — BJT Input Preamplifier

1.4 nV/√Hz input noise

BJT input, 100 MΩ input impedance

Gain of 10, 20, 50 or 100

Single-ended and differential inputs

AC coupled input

Powered by SRS lock-in amplifiers

SR552 specifications

Front Panel

The SR552 Voltage Preamplifier is designed to work with SRS lock-in amplifiers, providing gain where it is needed most—right at the experiment. The preamplifier minimizes noise and pickup in the connecting ines and can reduce measurement time in noise-limited experiments.

The SR552 differs from the SR550 in its bipolar front-end design. The SR552 has a lower input noise and a correspondingly lower input impedance (100 kΩ vs. 100 MΩ) than the SR550. When used with the SR510 or SR530, the preamplifier gain is automatically set by the lock-in. When used with the SR850, SR810 or SR830, the gain is always set to 100. Power and control signals are brought from the lock-in by a 9-pin cable (included). The SR552 may also be operated independently by applying appropriate power supply voltages (±20 VDC, +5 VDC).

Rear Panel

Noise -v- Frequency

Noise Figure Contour

SR552 Specifications


Input impedance	100 MΩ + 25 pF
Inputs	Single-ended or differential
Maximum input	70 mVrms for overload 50 VDC, 20 VAC damage threshold
Noise (typ.)	1.4 nV/√Hz at 1 kHz
	1.6 nV/√Hz at 100 Hz
	2.5 nV/√/Hz at 10 Hz
Coupling	AC (0.016 Hz)
CMRR (1V input)	100 dB at 100 Hz
Gain	10, 20, 50, 100 (automatically set by SR510 or SR530 lock-in amplifier)
Full scale input	10 nV to 200 mV
Gain accuracy	2 % (2 Hz to 100 kHz)
Gain stability	200 ppm/°C
Outputs	A (signal, 600 Ω, single-ended)
	B (shielded ground)
Maximum output	10 Vpp
Power	Supplied by SR510, SR530, SR810, SR830 or SR850 via connector cable
Dimensions	3.0" × 1.3" × 5.1" (WHL)
Weight	1 lbs.
Warranty	One year parts and labor on defects in materials and workmanship