Peterson AutoStrobe 490ST User Manual
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7
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the tuner to the note you are playing.
a. Connect an external microphone to the EXTERNAL INPUT connector of the tuner. Set this microphone on a stand
so that you can face away from the tuner.
b. Adjust the tuner to the tuning key of your instrument as detailed above. If necessary, raise or lower the standard
tuning reference pitch of the tuner (Concert A setting under the SETUP menu).
c. You are now ready to begin. For the remainder of this section we will assume that your instrument is tuned in “C”
to a pitch of A = 440 Hz. The normal RUN screen of the tuner will be displayed:
KEY= C
A=440 C 00 ¢
AUTO
SETUP MODE
1
2
3
4
d. Play your note into the microphone, while your partner watches the strobe window. While you are sounding your
note, your partner will press the UP ARROW and/or DOWN ARROW buttons until the dark markings on the tuning
wheel appear to be stationary. When these markings are stationary, the tuner is in tune with the note you are
playing.
e. The display will show the correctness of your intonation by indicating how many cents sharp or flat your partner
adjusted the tuner to match the note as you actually played it. This is presented at the “+” (sharp) or “-“ (flat)
“xx.x ¢” (cents) location of the display screen.
f.
Musical tuning is measured by a unit called cents, representing a 1/100 division of a semitone. There are 1200 cents
in each octave, and exactly 100 cents between each half-step note in equal temperament tuning. The Model 490-ST
is adjustable in a range of ±1/2 semitone (+50.0 cents sharp to -50.0 cents flat) from being perfectly in tune
(00.0 cents) at the selected temperament and scale note.
7. USING MUTE ON THE AutoStrobe 490-ST FOR SILENT TUNING
The Model 490-ST has an external input and “through” output with mute to allow silent on-stage tuning of instruments
without having to disconnect the tuner from your audio signal chain. When MUTE is active, any audio signal (originating
from the EXTERNAL INPUT jack or built-in microplone) to the front-panel EXTERNAL THRU jack is suppressed. Each
press of the MUTE button toggles the MUTE function on or off:
KEY= C
A=440 C 00 ¢
AUTO
SETUP MODE
1
2
3
4
MUTE
KEY= C
A=440 C 00 ¢
MUTE AUTO
SETUP MODE
1
2
3
4
Accessing the Mute Function