Stanford Research SR554 Transformer Preamplifier
The Stanford Research Systems SR554 is a transformer preamplifier designed for low-noise amplification of signals. It provides high common-mode rejection and excellent gain stability, making it suitable for various applications. Ideal for amplifying low-level signals in noisy environments, enhancing measurement accuracy.
- Model
- Stanford Research Systems SR554
- Calibration
- Available on request
- Price
- $2,675
- Status
- In stock
- RFQ ref
- SR554
This unit
The Stanford Research Systems SR554 Transformer Preamplifier delivers ultra-low-noise amplification for precision measurement applications requiring exceptional common-mode rejection and gain stability. Built around a transformer-coupled input architecture, the SR554 provides galvanic isolation exceeding 40 dB from DC to 500 MHz while operating across source impedances of 0.05 Ω to 1 kΩ. Two operational modes accommodate different measurement demands: bypassed mode supplies 100× gain through the passive transformer alone, while non-bypassed mode adds a buffer amplifier to achieve 500× gain with low output impedance.
Technical Specifications
- Input noise: 0.1 nV/√Hz
- Bandwidth: 0.1 Hz to 40 kHz
- Gain: 100× (bypassed); 500× (non-bypassed)
- Gain accuracy: 5% (fixed source resistance)
- Gain stability: 100 ppm/°C
- Common-mode rejection ratio: >120 dB below 1 kHz, 140 dB @ 100 Hz, up to 160 dB below 10 Hz
- Common-mode range: Primary floats to ±100 VDC
- Input impedance: 0.5 Ω (transformer + buffer); >5 kΩ (transformer only)
- Maximum input: 14.0 mV RMS transformer+buffer; 350 mV RMS transformer only
- Maximum output: 100 Vpp transformer only; 20 Vpp transformer+buffer
Key Features
- Transformer isolation provides DC blocking and EMI rejection across wide frequency span
- Selectable gain configurations optimize for signal conditioning or direct buffering
- Floating primary accommodates high common-mode voltages
- Differential and single-ended input/output connectivity
- Compact form factor: 3.75" × 3.0" × 7.5" (W × H × L); 4 lbs
Typical Applications Low-temperature synchronous detection, high-impedance source conditioning, common-mode noise rejection in differential measurements, isolated signal pre-amplification for lock-in detection systems.
Compatibility & Integration Operates as a front-end instrument for SRS lock-in amplifiers (SR510, SR530, SR810, SR830, SR850, SR124) via control cable, or standalone with external ±20 VDC supply (100 mA).
Specifications
| Parameter | Value |
|---|---|
| Frequency Range | 0.1 Hz to 40 kHz | Voltage / Current Range: ±100 VDC common-mode range |
| Maximum input | 14.0 mV RMS (±20 mV peak) transformer+buffer, 20 Vpp transformer+buffer, 350 mV RMS (±0.5 V peak) transformer only |
| Maximum output | 100 Vpp transformer only |
Stanford Research Systems SR554 — Repair & Calibration Service
Aumictech offers NIST-traceable calibration and repair for the Stanford Research Systems SR554. All calibrations are performed to NIST-traceable standards and ship with a certificate. Turnaround is typically 1–3 business days after receipt.
Stanford Research Systems SR554 price
This Stanford Research Systems SR554 is listed at $2,675. Calibration is available separately from $450. Contact us for volume pricing or if you need multiple units.
Stanford Research Systems SR554 calibration cost
NIST-traceable calibration for the Stanford Research Systems SR554 is $450 (standard — pass/fail certificate and calibration sticker) or $650 (full measured data at every test point, reference standards documented, traceability chain included). Turnaround is 1 to 3 business days after receipt. See full calibration details →
