If you have a Thunderbolt and have it configured for an external oscillator,
Lady Heathers' "&a" autotune command will determine and display the
oscillator EFC sensitivity. It works by setting the DAC voltage a few
millivolts high, measuring the frequency, setting the EFC a few millivolts
low, measuring the frequency, and calculating the gain value in Hz/volt. The
process takes a couple of minutes. Typical values for the standard Tbolt
oscillator are around -3.5 Hz/volt.
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