Clock Dialog


Single card clock setup

Multiple cards clock setup

This dialog holds all the clock related settings of the current card selection. Depending on the selected clock mode a different set of input widgets are visible. The pictures above show the clock dialog for single cards (on the left) and for multiple cards (on the right).

Common Setup for both dialog types

Mode: The clock mode selects whether to use internal or external clock, reference clock or any other special clock mode. After selecting the correct clock mode the dialog will change and only show the settings that are needed now.

Clock/Time Button: The button switches the display and the input fields between clock (frequency) and time input. To enter a clock you may use the modifier k for Kilo Hertz (kHz), M for Mega Hertz (MHz) and G for Giga Hertz (GHz). To enter a time you may use n for nano seconds (ns), u for micro seconds (us), m for milli seconds (ms)

Available Clock settings:

The list below shows all clock settings that may be available using SBench 6. However not all of these modes may be supported by the hardware you're using. In that case only the modes supported by your hardware are shown within the dialog.

Int. Clock Type in the desired internal sampling rate or select one from the list.
Int. Quartz 1 Similar to the first option but using the onboard quartz instead of the PLL.
Int. Quartz 2 If your card is equipped with an optional second quartz, you can enable it here.
Ext. Clock Type in the externally fed in sampling rate as exactly as possible. This value is used for display x-axis as well as calculation of the correct clock settings.
Divider Type in a divider that is used on the external clock to generate the sampling clock.
Reference Clock Specify the reference clock that is used as a base for clock generation.
Output Enable the clock output. Beside the checkbox SBench6 will display the frequency of the output.
Term Enable the clock termination. Make sure that the clock source is able to drive the termination load properly.
Fine Clock Granularity On some cards it is possible to enable a finer clock granularity. If this option is enabled the clock can be set in finer steps, but at the cost of reduced gain accuracy. See the hardware manual (SPC_SPECIALCLOCK) for more details.

Interpolation Factor: If the interpolation factor is higher than 1 all analog data for Analog display and Spread display as well as the source data for calculations will be interpolated using SI interpolation (also called sinc interpolation or sin(x)/x interpolation). The interpolation factor defines the number of interpolated samples that will be added: a factor of two means one additional interpolated sample, a factor of four means three additional interpolated samples, and so on. Changing the factor will immediately update displays and calculations.
Keep in mind that interpolation can be very compute-intensive and might take some time to finish.

Special Clock settings for multiple cards

Master: Select the master card that generates the clock for all cards. If using external clock this must be the card which has the external clock connected. If only one card is in the system this setup won't be available.

Clock Dividers: All slave cards may run with a divided clock that is derived from the master clock. Please note that this feature is not supported by all hardware and may not be available with your specific hardware. If available one simply selects a new division factor for each card. The resulting sampling rate depending on the selected master sampling rate is shown in the list as done in the example also.


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SBench 6 Documentation