Peterson AutoStrobe 490 - Manual (Page 20)

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7
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KEY= C
A=440 C 00 ¢
AUTO
SETUP MODE
1 2 3 4
KEY
KEY= Bb
A=440 C 00 ¢
AUTO
SETUP MODE
1 2 3 4
Choosing Alternate KEY Transpositions
5. ENHANCED RESOLUTION OF INTONATION MEASUREMENTS
As you continue to practice your intonation with the Model 490, you will find that your pitch accuracy continually improves.
As you find yourself playing more and more closely to perfect intonation, you may wish to adjust the tuner more precisely
to your pitch. The Model 490 has tuning accuracy to within 0.1 cents. The tuner may be adjusted to your note within that
same accuracy. The tuner always powers up with a displayed resolution of 1 cent. This is shown as "00 ¢". When operating
under the RUN screen, the tuner can be set for enhanced resolution of either 0.5 cents or 0.1 cents. Press and hold the
ENTER button, then press either the UP ARROW or DOWN ARROW button and the resolution will be changed to
0.5 cents. To further enhance the resolution to 0.1 cent increments, first release the ENTER button, then press and hold it
again while you press either the UP ARROW or DOWN ARROW button. The LCD screen always presents enhanced
resolution of 0.5 cents and 0.1 cents by showing "xx.x ¢", that is, three digits with a decimal point in the number.
When the tuner is set for enhanced resolution, the UP ARROW and DOWN ARROW buttons increment/decrement the
tuning adjustments of the tuner in steps of 0.5 cents or 0.1 cents. This permits intonation measurements with an accuracy
of 1/200 or 1/1000 semitone.
The resolution of the tuner may be returned to 1 cent resolution by again using the UP ARROW or DOWN ARROW buttons
in conjunction with the ENTER button (press and hold the ENTER button and then press either UP ARROW or DOWN
ARROW). The tuner resolution cycles through a selection sequence of 1 cent, 0.5 cent, 0.1 cent, 1 cent, etc. Note that the
tuner requires you to release the ENTER button between each step of this resolution selection cycle. Then press and hold
it again to go to the next resolution selection.
Note: Upon returning to the RUN screen from FILE (temperament) menus, 0.1 cent resolution remains active.
Other possible uses of the enhanced resolution of 0.5 cents, or 0.1 cent could be for exact measurements of precise partial
tone frequencies during the manufacture of percussive musical instruments (for example - bells, chimes, gongs, etc.), or for
specific scientific research into the timbral

structure of complex sounds and vibrations in the musical and audible frequency
spectrum. Yet another use is to allow the tuner to more precisely match a currently sharp or flat instrument (such as a piano
or organ) so that the tuner can then be used to tune other instruments in the ensemble.
6. CHECKING INTONATION WITH THE AutoStrobe 490
When you wish to check your playing intonation, the tuner can assist in a very simple manner. You will need a partner to
adjust the tuner to the note(s) you are checking.
When checking and adjusting your own intonation, it is probably better to use an external microphone. Turn your back to
the tuner while playing your note so you don't see the indications on the tuning disc while your partner is making the
adjustments. That way you will be less likely to slowly change your intonation at the same time your partner is adjusting
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