dk 477-200A Посібник користувача - Сторінка 3

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13. DC-warning. Any DC content in the audio signal is deliberately filtered out and will not affect the reading. The
DC LED will however indicate if abnormal DC levels are present in the audio signal.
14. Overload LED. Overload indication, left channel.
15. Overload LED. Overload indication, right channel.
NOTE: On some versions the buttons 1-4 have been omitted for simplicity reasons.
Instrument set-up.
Numerous parameters (like ref. level etc.) may be set by means of the four buttons on the front.
Normally the standard parameters set by the factory will be satisfactory and therefore no adjustments are needed.
Any adjustment should be done by skilled personnel following the instructions below.
In the following the buttons are referred to by numbers (1,2,3,4) where "1" is the leftmost button (or upper on horizontal
scales). Press button 1 is written: [1]. Two buttons may be pressed simultaneously i.e. [1+3].
Adjustment of reference level:
1.
Press [1+3] and hold for more than 1.6 s. The display will be lit in both channels with markings pr. 1 dB.
2.
Press [3] to decrease reference level in 1 dB steps. Scale max. equals digital FS.
3.
Press [4] to increase reference level in 1 dB steps. Scale max. equals digital FS.
4.
Press [1] to save settings and resume to normal operation. (Or press [2] to jump to next adjustment point 2)
Activating / deactivating display ballistics:
1.
Press [1+3] and hold for more than 1.6 s. The display will be lit in both channels with markings pr. 1 dB.
2.
Press [2]. The display will be lit in the left channel with markings pr. 1dB.
3.
Press [2]. The display will be lit in the right channel with markings pr. 1sample.
4.
Press [2]. The left overload LED will be lit.
5.
Press [3] or [4] to toggle display ballistics on/off. Ballistics is on when the right overload LED is lit.
6.
Press [1] to save settings and resume to normal operation.
Compensation for "ghost" spot. (Only required if display is replaced.
1.
Press [1+3] and hold for more than 1.6 s. The display will be lit in both channels with markings pr. 1 dB.
2.
Press [1] and hold for more than 6 s. All LED's are lit in sequence for inspection.
3.
Press [2] The display will be lit in both channels with a falling spot in the right channel.
4.
Press [3] if a bright "ghost" of the spot appears in the left channel.
5.
Press [4] if a dark "ghost" of the spot appears in the left channel.
6.
Press [1] to save settings and resume to normal operation.
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Document no. 477-2010A page 3 of 3