15
Filter selection
To clarify the leak noise, background or unwanted noise frequencies can be filtered
out using the High Pass and Low Pass filter buttons. To filter out low frequencies,
use the High Pass buttons as shown below.
High pass filter settings
High Pass filter
Press once to increment the filters at 30Hz intervals. This will only allow frequencies
above each selection to pass through. All frequencies below this are blocked.
Press once for 30Hz
Press twice for 60Hz
Press three times for 90Hz
Press four times for 120Hz.
The high pass filters have these four settings only.
To reduce the filter setting, press the left hand button.
Low pass filter settings
The low pass filter settings work in a similar way but with the ranges listed below.
The highest frequency that can be passed through the unit is 3kHz.
To reduce the frequencies passed…
Press the left low-pass filter button once for 2kHz
Press twice for 1.5kHz
Press three times for 700Hz and
Press four times for 300Hz
The minimum band pass is 120 - 300Hz
There are a total of 25 combinations of selectable filter settings.
Back light
To view the LCD display in bad light, illuminate the backlight by pressing the
combined On/Off Backlight switch briefly. This then latches the backlight in an on-
position. Note, the backlight automatically switches off after 1 minute to conserve
battery power.
Press the same button again to re-illuminate the backlight.
To switch it off, press this same button momentarily.
Low
pass
filter
High
pass
filter
