SR554 Transformer Preamplifier0 pages

Lock-In Preamplifier
SR554 — Transformer preamplifier with differential input

SR554 Transformer Preamplifier
The SR554 is a low-noise, transformer-coupled preamplifier
optimized for source impedances between 0.05 Ω and 1 kΩ.
With an input noise of only 0.1 nV/√Hz, the SR554 can
be used in a wide range of low-noise applications. It is the
ideal preamplifier for low-temperature, synchronous detection
applications where isolation between the experimental sample
and the lock-in amplifier is critical.

· Transformer-coupled input
· 0.1 nV/√Hz input noise
· 0.1 Hz to 40 kHz bandwidth
· Gain of 100 or 500
· Single-ended and differential inputs
· >40 dB isolation from DC to 500 MHz
· Powered by SRS lock-in amplifiers

The SR554 can operate in one of two modes. In the
“bypassed” mode, the instrument is simply a passive
transformer with a turns ratio of 100, providing an overall
voltage gain of 100. In the “non-bypassed” mode, an additional
amplifier (gain of 5) is added, increasing the overall gain to
500 and providing a low-impedance (<1 Ω) output. In the
bypassed mode, the SR554 requires no external power. When
using the output amplifier, ±20 VDC must be supplied. The
preamplifier connector on SRS lock-ins can be used to power
the SR554.

· SR554 ... $1200 (U.S. list)

Stanford Research Systemst
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