Trace Math

TRACE MATH

This example is designed to familiarize the user with the trace math functions in the lock-in. You will need BNC cables and a 50Ω terminator.

Specifically, you will record the input noise in a trace and perform various calculations with the trace. The internal oscillator will also be used to provide signal data for curve fits.

There are a few points to remember about the trace math functions.

Math functions may only be performed on trace data which is stored in a trace buffer and displayed in the active chart display. Data which are not within the time window of the chart are not operated upon. Use the horizontal chart scale to select the size of the time window and move the cursor to pan the window to the desired portion of the trace buffer. Data which exceeds the upper or lower display range of the graph are, of course, operated upon.

The amount of time a math function takes to complete depends upon its complexity and the number of data points which are operated on. For example, 25-point smoothing takes longer than 5-point smoothing while each type of smoothing takes longer the more points there are. Do not operate on more points than necessary.

Math functions can only be performed while data acquisition is stopped, either by pausing or finishing a scan. Some math operations change the stored trace data. Resuming a scan after smoothing, for example, will result in a trace where a region of the trace is smoothed and other regions are not.

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 a 50Ω terminator to the A input.

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 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 terminator effectively provides a short at the input so that the input noise is predominantly the volt- age noise of the input transistors.

The lock-in defaults to the internal oscillator refer- ence set at 1.000 kHz. All measurements will be made at 1 kHz in this example.

3. Press [GAIN/TC]

Display the Gain and Time Constant menu.

Press <Sensitivity>

Highlight the sensitivity.

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SRS Labs SR850 manual Trace Math
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