Input and Filters Menu

Grounding

Coupling

Line Notches

The current gain determines the input current noise as well as the input bandwidth. The 100 MΩ gain has 10 times lower noise but 100 times lower bandwidth. Make sure that the signal frequency is below the input bandwidth. The noise and bandwidth are listed below.

Gain	Noise	Bandwidth
1M	130 fA/√Hz	70 kHz
100M	13 fA/√Hz	700 Hz

The impedance of the signal source should be greater than 1 MΩ when using the 1M gain or 100 MΩ when using the 100M gain.

Changing the current gain does not change the instrument sensitivity. Sensitivities above 10 nA require a current gain of 1 MΩ. Sensitivities between 20 nA and 1 µA automatically select the 1 MΩ current gain. At sensitivities below 20 nA, changing the sensitivity does not change the current gain.

This key chooses the shield grounding configuration. The shields of the input connectors (A and B) are not connected directly to the lock-in chas- sis ground. In Float mode, the shields are connected by 10 kΩ to the chassis ground. In Ground mode, the shields are connected by 10 Ω to ground. Typically, the shields should be grounded if the signal source is floating and floating if the signal source is grounded. Do not exceed 1 V on the shields.

This key selects the input coupling. The signal input can be either AC or DC coupled. The current input is coupled after the current to voltage con- version. The current input itself is always DC coupled (1 kΩ to virtual ground).

The AC coupling high pass filter passes signals above 160 mHz and attenuates signals at lower frequencies. AC coupling should be used at frequencies above 160 mHz whenever possible. At lower frequencies, DC coupling is required. AC coupling results in gain and phase errors at low frequencies. Remember, the Reference Input is AC coupled when a sine reference is used. This also results in phase errors at low frequencies.

This key selects no line notch filters engaged (Out), either the line fre- quency (Line) or twice line frequency (2xLine) notch engaged, or Both fil- ters engaged. The line notch filters are pre-tuned to the line frequency (50 or 60 Hz) and twice the line frequency (100 or 120 Hz).

These filters have an attenuation depth of at least 30 dB. These filters have a finite range of attenuation, generally 10 Hz or so. If the reference frequency is 70 Hz, do not use the 60 Hz notch filter! The signal will be attenuated and the phase shifted. See the SR850 Basics section for a discussion of when these filters improve a measurement.

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SR850 specifications

The SRS Labs SR850 is a high-performance audio processor designed to enhance the listening experience across a variety of applications. With its advanced technologies, the SR850 delivers superior sound quality that is particularly noticeable in environments where audio clarity and fidelity are paramount. This device caters to audio professionals, audiophiles, and casual listeners who demand exceptional performance from their audio systems.

One of the standout features of the SR850 is its proprietary SRS 3D Audio technology. This innovative feature creates a more immersive soundstage, allowing users to experience audio as if they were in a live performance setting. By adding depth and dimension, it elevates the listening experience, making music, movies, and games far more engaging.

Additionally, the SR850 incorporates SRS dialog clarity technology, which enhances speech intelligibility in dialogues and vocals. This is particularly beneficial in film and television viewing, where dialogue can sometimes be drowned out by background music or sound effects. With dialog clarity, users can enjoy crystal-clear conversation tracks without adjusting volume levels continuously.

The device also supports various audio formats, ensuring compatibility with a broad range of media. It boasts inputs for both digital and analog sources, allowing connections to various devices such as TVs, laptops, gaming consoles, and more. The versatility of inputs makes the SR850 a convenient addition to any home entertainment system.

Another impressive characteristic of the SR850 is its compact and user-friendly design. The intuitive interface makes it easy for users to adjust settings to their preference, whether they are a novice or an audio expert. The device is equipped with programmable presets, enabling users to store their favorite sound profiles, making switching between settings quick and hassle-free.

Furthermore, the SR850 features advanced EQ capabilities, granting users the ability to tailor the audio output to their specific tastes. This personalized approach to sound adjustment enhances the overall experience, allowing users to get the most out of their audio content.

In summary, the SRS Labs SR850 is a sophisticated audio processor packed with features designed to significantly uplift sound quality and listening pleasure. With its cutting-edge technologies such as SRS 3D Audio and dialog clarity, an array of connectivity options, and customizable EQ settings, the SR850 stands out as an outstanding option for anyone looking to enhance their audio experience. Whether for professional use in sound engineering or personal enjoyment in home entertainment, the SR850 proves to be a valuable asset.

SRS Labs SR850 manual Input and Filters Menu, Grounding Coupling Line Notches

Models: SR850