Displays and Traces

DISPLAYS and TRACES

This measurement is designed to use the internal oscillator and an external signal source to explore some of the display types. You will need a synthesized function generator capable of providing a 100 mVrms sine wave at 1.000 kHz (the DS345 from SRS will suffice), BNC cables and a terminator appropriate for the gener- ator function output.

Specifically, you will display the lock-in outputs when measuring a signal close to, but not equal to, the inter- nal reference frequency. This setup ensures changing outputs which are more illustrative than steady outputs. The displays will be configured to show X, Y, R and θ in bar graph and polar formats. The example Scans and Sweeps demonstrates the use of the chart graph.

1.Disconnect all cables from the lock-in. Turn the power on while holding down the [←] (backspace) key. Wait until the power-on tests are completed.

2.Turn on the function generator, set the fre- quency to 1.0000 kHz (exactly) and the ampli- tude to 500 mVrms.

Connect the function output (sine wave) from the synthesized function generator to the A input using a BNC cable and appropriate terminator.

When the power is turned on with the backspace key depressed, the lock-in returns to its default settings. See the Default Settings list in the Menu section for a complete listing of the settings.

The display is the "normal" lock-in display. The lock-in setup is displayed across the top of the screen. The sensitivity, reserve, time constant, prefilters and input configuration are all easily visi- ble. Watch how these indicators change as you change parameters. The upper numeric readout and bar graph shows the value of X (Rcosθ) and the lower graph shows the the value of Y (Rsinθ).

The input impedance of the lock-in is 10 MΩ. The generator may require a terminator. Many genera- tors have either a 50Ω or 600Ω output impedance. Use the appropriate feedthrough or T termination if necessary. In general, not using a terminator means that the function output amplitude will not agree with the generator setting.

The lock-in defaults to the internal oscillator refer- ence set at 1.000 kHz. The reference mode (Intrnl) and frequency are displayed at the bottom of the screen. In this mode, the internal oscillator sets the detection frequency.

The internal oscillator is crystal synthesized so that the actual reference frequency should be very close to the actual generator frequency. The X and Y displays should read values which change very slowly. The lock-in and the generator are not phase locked but they are at the same frequency with some slowly changing phase.

3. Press [REF/PHASE]

Display the Reference and Phase menu.

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SRS Labs SR850 manual Displays and Traces
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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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