Wohler AMP1-SDA Guide de l'utilisateur télécharger pdf (Page 17)

821027: AMPx-SDA User Guide

AMPx-SDA User Guide

Rear Panel Connectors

• Line Level Calibration: The unit is calibrated at the factory.

To recalibrate:

1) Turn on the power.

2) Apply a reference level (nominal 0) signal to all four

channels.

3) Make sure the Gain Calibration DIP sections (S2, S3) are set to

the nearest level (i.e., 0, +4, +6 or +8).

4) Place section S1 of the DIP switch in the DOWN position.

5) Wait 10 seconds. The unit will remove the previous calibration.

The unit will make sure that all four channels are within ±4 dB

of nominal zero. If all four channels are within this range

then the new calibration will be applied. If any channel is

outside this range then no new calibration will be

applied.

6) Place section S1 of the DIP switch in the UP position and

return unit to service. If you want to calibrate again, turn

off the power to the unit and repeat steps 1 through 6.

See Figure 1–8 on page 14 for settings.

• Meter Gain Calibration: DIP switch sections S2 and S3

determine the Gain Calibration, which adjusts the level of the

input signal and the resultant "0" level displayed on the LED

bargraphs. Factory setting is +4 dB. See Figure 1–8 on page 14

for all settings.

• Bar Graph Display Mode: DIP switch sections S4 and S5

determine how peak levels are displayed for the four

associated meters on the front panel. S4 selects either the PPM

level or a new auto-reset Peak Hold of the VU level (not the

PPM value). When S3 is set for VU Peak, S5 sets the Hold time

to either 3 or 10 seconds. If S4 is set for PPM Peak, S5

determines whether it is displayed in the original floating

PPM dot mode (no hold, continuous decay of 20 dB in 1.5

seconds) or as a 3 second auto-reset hold. The factory default

setting is PPM Peak - No Hold (continuous decay of 20 dB in

1.5 seconds). See Figure 1–8 on page 14 for all settings. Note

that section S6 on the DIP switch is not used.

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Wohler AMP1-SDA Guide de l'utilisateur Page 17