Noise Figure, Using the SR554 with SRS LOCK- INS

EXTRA LOW NOISE MEASUREMENTS When making extremely low noise measurements, it is a good practice to connect the grounding plug of the SR554 to a ground point near the experiment. If a good ground is not available near the experiment, connect a wire from the lock- in chassis (using a lug under one of the chassis screws) to the grounding lug of the SR554.

NOISE FIGURE

The noise figure describes the noise contribution of an amplifier in a measurement when compared to an ideal amplifier.

The expression:

where N is the measured noise, A is the pre-amp gain and enrs is the Johnson noise of the source impedance, describes the noise figure contours shown below. The optimum operating frequency can be determined from this graph.

USING THE SR554 WITH SRS LOCK- INS

The SR554 is not sensed through the 9 pin cable by SRS lock-in amplifiers. Therefore the lock-in does NOT compensate for the gain of the preamp. Measurements made using the preamp must be divided by the gain of the SR554. The actual gain can be obtained from the amplitude response curves on page 4.

USING THE SR554 WITH THE

SR810/830/850

For typical measurements the lock-in input should be set to AC coupled, with the shield grounded. For low frequency measurements (<1Hz), set the lock-in to DC coupled, with the shield grounded, since the SR554 can sense signals below the lock-in’s AC coupling frequency (0.16 Hz).

USING THE SR554 WITH THE

SR510/530

The SR510/530 is AC coupled from 0.5 Hz to 100 kHz. Measurements below 0.5 Hz are not recommended with the SR510/530.

SR554 specifications

SRS Labs SR554 is an advanced audio processing solution that aims to enhance audio quality across various media platforms. Recognized for its innovative approach to sound enhancement, the SR554 incorporates a variety of technologies designed to create a richer, more immersive listening experience.

One of the standout features of the SRS Labs SR554 is its Superior Sound technology, which employs advanced algorithms to optimize audio output for different types of content. Whether users are listening to music, watching movies, or playing video games, the SR554 intelligently adjusts the audio output to suit the specific requirements of each medium. This adaptability is crucial in today’s diverse audio landscape, ensuring that users enjoy the best possible sound quality regardless of the source.

The SR554 also integrates SRS's renowned TruBass technology, which enhances low-frequency audio signals to produce deeper, more resonant bass without sacrificing clarity. This feature is particularly beneficial for genres such as hip-hop and electronic dance music, where bass plays a pivotal role in the overall impact of the audio experience. By creating a more balanced and full-bodied sound, the SR554 caters to audiophiles and casual listeners alike.

Additionally, the SR554 is equipped with SRS Virtual Surround technology, which simulates a multi-channel audio experience from standard two-channel setups. This feature provides users with an enveloping soundstage, making it ideal for home theater systems and gaming setups. By creating a perception of height, width, and depth in sound, the SR554 enhances the realism of audio playback, making users feel as though they are part of the action.

Compatibility is another key characteristic of the SR554. The solution supports a wide range of audio formats, ensuring that it can seamlessly integrate into various devices and platforms, from smartphones to high-end audio systems. This versatility allows users to experience enhanced audio quality no matter how or where they choose to consume their media.

In terms of user customization, the SR554 offers an array of adjustable settings, allowing users to tailor their audio experience according to their preferences. This tailored approach means that whether someone seeks a more vibrant sound or a subtle auditory atmosphere, the SR554 can be fine-tuned to meet those needs.

In summary, the SRS Labs SR554 stands out in the crowded audio enhancement market through its innovative technologies geared towards delivering superior sound, enhanced bass, and immersive audio experiences. Its adaptability, compatibility, and customization options make it a compelling choice for anyone seeking to elevate their audio experience across a wide range of media formats.