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Preamplifier SR554 ... from $1200
SR554 Transformer input preamplifier
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SR554 Transformer Preamplifier
  • 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 (DC to 500 MHz)
  • Powered by SRS lock-ins
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.
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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.

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 with a gain of 5 is added increasing the 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.

 

 

 

 

 

 

 

 

 

Phone: (408)744-9040 • Fax: (408)744-9049 • email: info@thinkSRS.comwww.thinkSRS.com

SR554 Transformer Preamplifier
General
Mode Single-ended or differential
Noise 0.1 nV/√Hz
Source impedance 0.05 Ω to 1 kΩ (recommended)
CMRR >120 dB below 1 kHz
Common mode range Primary can float to ±100 VDC
Gain 100× (Transformer only)
500× (Transformer and buffer)
Max frequency response 0.1 Hz to 40 kHz
Isolation >40 dB, DC to 500 MHz
Output Single-ended or differential
Maximum output 100 Vpp (Transformer only)
20 Vpp (Transformer and buffer)
Output impedance >5 kΩ (Transformer only)
<1 Ω (Transformer and buffer)
Dimensions and weight 3.75" × 3.0" × 7.5" (WHL), 4 lbs.
Power Supplied by SRS lock-ins. Ext. ±20 VDC supplies can also power the SR554.
Warranty One year parts and labor on defects in materials and workmanship
   
   
 
Phone: (408)744-9040 • Fax: (408)744-9049 • email: info@thinkSRS.comwww.thinkSRS.com