Fisher Labs XLT-30 - High Range Filter; Low Range Filter; Frequency Choice Filter; Hold and Mute Functionality

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(The following lter modes have a frequency range from 60 Hz to 2.4
kHz)
HI (High Range) – This ltering mode allows the user to adjust the
response in the higher areas of the frequency range. Use the arrow keys
to increase or decrease this frequency response range.
LO (Low Range) – Similar to the previous lter mode, the lowpass
lter allows the user to listen to the lower areas of the frequency range.
The arrow keys are used to increase or decrease this frequency response
range.
FC (Frequency Choice) – This lter could also be called Frequency
Select. This mode allows tuning to the frequency that gives the user the
best response. The arrow keys are used to move the cursor, selecting a
narrow frequency band of choice
HOLD/MUTE
This dual purpose button is both a mute control and a peak hold
reset control.
Mute – As the name applies, muting disengages the sound to the
user. There is also a control on all listening microphones. Learn to use
this control to prevent excessive noise to your ears when the probes are
moved.
Hold – The display of the XLT-30 will show the highest sound level
recorded. This reading can be reset by pressing this pad. Resetting the
Peak Hold clears earlier readings of the Peak sound.
ARROW KEYS
These keys allow features of the XLT-30 to be modied.
RESUME
After any modication has been made to the XLT-30 (VOLUME, NOTCH,
or FILTER), depressing the RESUME will return the display screen back to
a Meter function (Sound Graph).
CONTROL PANEL