Scans and Sweeps

SCANS and SWEEPS

This measurement is designed to use the internal oscillator to explore some of the basic lock-in functions. You will need BNC cables.

Specifically, you will measure the response of the line notch filters by sweeping the internal reference frequen- cy and measuring the sine output. Traces and strip chart displays will be used to record X, Y, R and θ as the signal is swept through the input notch filters.

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.Connect the Sine Out on the front panel to the A input using a BNC cable.

3.Press [INPUT/FILTERS]

Press the <Line Notches> softkey until Both fil- ters are selected.

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 Sine Out has an output impedance of 50Ω. Since the Sine Output amplitude is specified into a high impedance load, the output impedance does not affect the amplitude.

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 lock-in generates a syn- chronous sine output at the internal reference frequency.

The sine amplitude is 1.000 Vrms and the sensitivity is 1 V(rms). Since the phase shift of the sine output is very close to zero, the upper display

(X)should read close to 1.000 V and the lower dis- play (Y) should read close to 0.000 V.

Display the Input and Filters menu. This menu allows the input configuration to be changed.

With the line notch filters engaged, signal inputs at 60 (50) Hz and 120 (100) Hz are removed. Note that the line filter indicators at the top of the screen are both on.

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SRS Labs SR850 manual Scans and Sweeps
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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.

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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.

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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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