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:warning: *The program is still under development and subjected to change*
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**Revolution frequency**
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**Revolution frequency**
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- Can either be locked to frequency of signal connected to RF port (uses a phase-locked-loop, PLL, not available for all flowgraphs)
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- Can either be locked (with a PLL) to RF reference signal (connected to RF input 1)
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or a custom value can be entered by the user
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or set by the operator to a fixed value
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**Output**
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- Signal bursts are started upon pos. trigger flank for the specified duration (see also [delay](commissioning/delay)). A duration of zero means "gated mode", i.e. the burst duration is defined by the trigger pulse duration. You can also manually trigger the device using the toggle button
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- Output of the DAC is limited to ±1 V. Overload ratio shows the ratio (in time) during which the limit is exceeded (i.e. the signal is clipped and thus unwanted frequency components introduced). The levels should be adjusted such that the ratio stays below 1%.
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**Excitation signal**
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**Excitation signal**
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- Excitation band width is set in kHz and also shown in tune units (it will become narrower during ramp to account for increased rigidity)
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- Excitation band width is set in kHz and also shown in tune units
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- The tune is set with respect to the revolution frequency, higher order sidebands are supported by putting in values > 1 (but best results have been found for baseband, e.g. q < 0.5)
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This ensures it will become narrower during ramp to account for increased rigidity
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- Some flowgraphs support different signal types, see [spectrum](commissioning/spectrum)
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- The fractional tune is set with respect to the revolution frequency
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- Most flowgraphs support two excitation signals (1 and 2), the level of which can be individually adjusted for either plane (X and Y). Most commonly you will use Signal 1 on X and 2 on Y.
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Higher order sidebands are supported by values > 1, but best results have been found for baseband, e.g. q < 0.5
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- Some flowgraphs support a linear ramp for the tune
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- The signal levels can be set individually, usually Y requires less power
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**Output**
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- Signal bursts are started upon pos. trigger flank for the specified duration
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A duration of zero means "gated mode", i.e. the burst duration is defined by the trigger pulse duration.
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You can also manually trigger the device using the toggle button (e.g. for testing)
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- The output signal (either X or Y, select via menu) can be monitored
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The DAC is limited to ±1 V and signals are clipped if the level is too large, which results in broadband signals and will saturate the amplifiers.
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Make sure the output for both X and Y is not overloaded (overload ratio shows the percentage in time during which the DAC is overloaded and should stay below 1%).
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**Performance**
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**Performance**
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- If you see lots of letters `U` printed on the console, this indicates a performance issue. In this case please contact us |
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- If you see lots of letters `U` printed on the console, this indicates a performance issue.
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\ No newline at end of file |
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