Scope Tab

Scope

Displays shots of data samples in time and frequency domain (FFT) representation.

Single

Acquires a single shot of samples.

Run/Stop

Runs the scope/FFT continuously.

Signal Input

Signal Input 1

Selects the source for the scope input.

Signal Input 2

Enable

ON / OFF

Activates the display of the corresponding scope channel.

Hardware Averaging

Enable hardware averaging where results are available and displayed only once all necessary shots have been acquired. As opposed to the EMA filter, the source data for hardware averaging is always the time trace before any postprocessing such as FFT.

Off

Hardware Averaging is turned off.

On

Consecutive scope shots are averaged by the device.

Mode

Time Domain

Switches between time and frequency domain display.

Freq Domain (FFT)

Sampling Rate

Defines the sampling rate of the scope. The numeric values are rounded for display purposes. The exact values are equal to the base sampling rate divided by 2^n, where n is an integer.

Average Filter

Enable Exponential Moving Average (EMA) filter that is applied when the average of several scope shots is computed and displayed. Depending on the mode, the source data for averaging is either the Time or the Freq FFT trace.

Off

Averaging is turned off.

On

Consecutive scope shots are averaged with an exponential weight.

Averages

integer value

The number of shots to average on the device before returning the data.

Reset

Resets the averaging filter.

Enable

ON / OFF

Enable segmented scope recording. This allows for full bandwidth recording of scope shots with a minimum dead time between individual shots.

Segments

1 to 32768

Specifies the number of segments to be recorded in device memory. The maximum scope shot size is given by the available memory divided by the number of segments.

Shown Trigger

integer value

Displays the number of triggered events since last start.

BW Limit

Selects between sample decimation and sample averaging. Averaging avoids aliasing, but may conceal signal peaks.

OFF

Selects sample decimation for sample rates lower than the maximal available sampling rate.

ON

Selects sample averaging for sample rates lower than the maximal available sampling rate.

FFT Window

Rectangular

Several different FFT windows to choose from. Each window function results in a different trade-off between amplitude accuracy and spectral leakage. Please check the literature to find the window function that best suits your needs.

Hann

Hamming

Blackman Harris

Flat Top

Exponential (ring-down)

Cosine (ring-down)

Cosine squared (ring-down)

Resolution (Hz)

mHz to Hz

Spectral resolution defined by the reciprocal acquisition time (sample rate, number of samples recorded).

Absolute Frequency

ON / OFF

Shifts x-axis labeling to show the absolute frequency in the center as opposed to 0 Hz, when turned off.

Spectral Density

ON / OFF

Calculate and show the spectral density. If power is enabled the power spectral density value is calculated. The spectral density is used to analyze noise.

Power

ON / OFF

Calculate and show the power value. To extract power spectral density (PSD) this button should be enabled together with Spectral Density.

Persistence

ON / OFF

Keeps previous scope shots in the display.

The color scheme visualizes the number of occurrences at certain positions in time and amplitude by a multi-color scheme.

Rate

Streaming rate of the scope channels. The streaming rate can be adjusted independent from the scope sampling rate. The maximum rate depends on the interface used for transfer. Note: scope streaming requires the DIG option.

History

History

Each entry in the list corresponds to a single trace in the history. The number of traces displayed in the plot is limited to 20. Use the toggle buttons to hide or show individual traces. Use the color picker to change the color of a trace in the plot. Double click on a list entry to edit its name.

Length

integer value

Maximum number of records in the history. The number of entries displayed in the list is limited to the 100 most recent ones.

Clear All

Remove all records from the history list.

Clear

Remove selected records from the history list.

Load file

Load data from a file into the history. Loading does not change the data type and range displayed in the plot, this has to be adapted manually if data is not shown.

Name

Enter a name which is used as a folder name to save the history into. An additional three digit counter is added to the folder name to identify consecutive saves into the same folder name.

Auto Save

Activate autosaving. When activated, any measurements already in the history are saved. Each subsequent measurement is then also saved. The autosave directory is identified by the text "autosave" in the name, e.g. "sweep_autosave_001". If autosave is active during continuous running of the module, each successive measurement is saved to the same directory. For single shot operation, a new directory is created containing all measurements in the history. Depending on the file format, the measurements are either appended to the same file, or saved in individual files. For HDF5 and ZView formats, measurements are appended to the same file. For MATLAB and SXM formats, each measurement is saved in a separate file.

File Format

Select the file format in which to save the data.

Save

Save the traces in the history to a file accessible in the File Manager tab. The file contains the signals in the Vertical Axis Groups of the Control sub-tab. The data that is saved depends on the selection from the pull-down list. Save All: All traces are saved. Save Sel: The selected traces are saved.