SR850 Service

Adjusting the DC Offset and Common Mode Rejection

1.The DC Offset and CMRR adjustments affect each other and must be done together. This proce- dure requires a 50Ω terminator, a BNC Tee and a few BNC cables. A small slotted screwdriver is also required to adjust the potentiometers.

2.Turn the unit ON while holding the [<-] key down. This resets the unit. Let it warm up for at least an hour.

3.Remove the four black screws which secure the top lid. There are two screws on each side. Slide the top lid back about 1/4". Remove the lid by pulling the lid towards the back and upwards. Remove the card cage cover by loosening the two screws at the center edge of the cover.

4.The adjustment pots are on the Analog board on right hand side of the card cage. Remove the magnetic shield cover at the front of the Analog board. Simply pull the shield up using the finger hole.

5.The adjustment pots are shown in the figure.

The Offset and Common Mode adjustment pots are inside the shield which is mounted on the analog board.

DSP

Board

Front

Analog

Board

2xLine Notch Depth

Line Notch Depth

2xLine Notch Freq

Common Mode

Line Notch Freq

Voltage Input Offset

Current Input Offset

6. Press the following keys to set the frequency and display.

[REF/PHASE]

<Ref. Frequency> Select Reference Frequency

[1][ENTER] Enter 1 Hz [DISPLAY/SCALE]

<Type/Trace> Select Trace Number for Top display

[3][ENTER] Enter 3 to display R

7.Connect a 50Ω termination to the A input. This shorts the input so the lock-in's own DC offset will be measured.

Press

[GAIN/TC]

<Filter dB/oct> twice to select 24 dB/oct <Sensitivity>

Rotate the knob to select 100 mV full scale

8-3

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SRS Labs SR850 manual Adjusting the DC Offset and Common Mode Rejection, Ref/Phase
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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.
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