8
Operation
Power On
Press and hold the button until you hear the power-on beep
and see the red LED
light; release the button. Then you will
hear the self-test tone for one second during which time the
green LED
should be lit.
Change Gain
Short taps of the
+
or
–
buttons will increase or decrease the
gain in single steps. At each step, a tone is produced at a level
slightly different to the previous one. At maximum gain a high
pitched beep is generated, and at minimum gain a low pitched
beep is generated.
Change Filter Mode
Quickly tap both
+
and
–
buttons simultaneously to step the
unit through the three main operating modes:
Basic
Mains hum reject
(default power-on mode)
Precision tone
(500XP only)
LED and Tone Indications
Mode
•
Basic
– “beep” and red LED flashes.
•
Mains hum reject
– “beep-beep” and green LED flashes.
•
Precision tone
(500XP only) – “beep-beep-beep” and both
LEDs flash.
Signal Level
•
Basic
– red LED brightness is proportional to signal received.
•
Mains hum reject
– green LED brightness is proportional to
signal without AC mains power.
