Antex Electronics SX-5e - Manual (Page 50)

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“Meter Update Interval” determines how often the meter program
reads the level data from the Antex Card. Note that even if the
meter is in peak mode, peaks which occur in between the update
intervals will be missed. To avoid this, the update interval should
be 5 ms or less.
Once the meter is set the way you want, you can save and recall
these settings using the “Save/Restore Settings” menu selection.