When no Logic device is connected, the software will work in demo mode, which is virtually identical to how it will function when a device is connected. The demo will help you become familiar with the software before your Logic device arrives.
To start collecting data, just press the Start button. After the capture has started, you can stop it before it finishes, if you like. That will retain the data to that point.
If the Start button is gray and cannot be clicked, that means you are not on the capture tab. Look at the bottom of the window. On the left, you should see the capture tab. Click that tab and then take your capture.
To access device settings, click the up or down arrow next to the Start button.
Speed (Sample Rate)
The sample rate dropdown lets you select how fast to sample data—how many times per second your signal is measured. The available options depend on your device, the channels being used, and the performance level selected. Digital data are compressed. No additional memory is used when sampling faster. Rather, memory usage is proportional to the number of transitions in the digital data. Analog data are not compressed and consume roughly 4 bytes per sample. At 50Msps, that’s 200MB per second, per channel.
The duration text box allows you to enter the duration of your capture.
The channels control lets you quickly enable and disable the channels you would like. You can click and drag over the control to change a number of channels at the same time.
Using fewer channels uses less memory and allows for faster sampling.
Not all devices have selectable channels. The original Logic does not have selectable channels, and the new Logic 4 only allows you to enable or disable the analog input. The digital channels are always enabled. You can switch the analog channel on and off by selecting sample rate options with and without analog sample rates.
For devices that support it, you can edit the voltage level of your digital signals. That affects the voltages at which an input is considered a one or a zero.
Logic Pro 8, Logic Pro 16, and the original Logic16 are the only devices with adjustable thresholds. See the PDF Users Guide, Specifications, and Data Sheets to find what voltage options are available for each device.
Not all computers or USB host controllers will be able to capture at top speed. If that happens, you can throttle back the performance setting with this control. It will update the sample rates that are available.
The performance control is only available when analog and digital channels are enabled at the same time. When sampling digital only or analog only, slower sample rates will be available from the sample rate dropdown, which will reduce USB throughput.
Logic 4 is the exception to this. It will not display a performance selector even when recording analog and digital channels at once. All possible sample rates are always available in the dropdown.
If you have more than one Logic attached, you can toggle between them here. You also can control the LED color here. Just click the gear icon.
Closing the Device Settings Popover
To close the Device Settings, click on something outside the popover.
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