ID: 1745 / ver. 201
1. GAIN CONSTANT adjustment (mode1)
Adjustment
Read the sound level at the five different levels. Adjust so that the difference is 20 dB. The calibration
number indicates the difference between the 20 dB steps, so if the difference is too small, adjust up,
and if too large adjust down. Repeat the reading of the 5 sound levels and the adjusting, to get as close
as possible to the 20 dB difference. Select the opposite channel with the channel 1 output selector, and
repeat the adjustment with the other telephone.
This adjustment is to ensure that the attenuators attenuation is accurate at both large
and small attenuations. The adjustment is done at 1000 Hz through bandpass filter. Use
the frequency keys to choose between 20, 40, 60, 80 and 100 dB. The adjustment is
done with the channel 1 attenuator. A number in the range 0 to 199 is shown in the VU
display to show where the adjustment is standing. There is only one adjustment for each
channel, which will increase or decrease the difference between the 5 sound levels.
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