23
A
DJUSTING
SENSITIVITY
To improve audible resolution when locating closely spaced reinforcement bars it may be beneficial
to reduce the sensitivity below the optimum level described in the previous paragraphs.
It is also possible to reduce sensitivity deliberately so that bars of adequate cover are not indicated,
but bars of shallower cover are. Please note that this method will not confirm the presence of bars
with adequate or deeper cover.
During a search the sound from the speaker and the brightness of the LED may reach their
maximum level before the signal has reached its maximum. If this occurs, reduce the sensitivity until
the sound and LED are again responding readily to changes.
Note: Reducing the sensitivity does not reduce the overall sensitivity of the instrument, but will
reduce the sound and LED indications to zero when the search head is removed from the region of
high signal strength. This may cause deeply covered bars to be missed.
If the sensitivity is reduced to the minimum setting, the locate sound is muted
(indicated by a crossed-out loudspeaker symbol on the screen).
The sensitivity setting only affects the locate sound and the brightness of the
LED on the search head; it does not affect the cover measurement.
331.book Page 23 Thursday, March 12, 2009 9:51 PM
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