Bird Technologies ACMI - Manual (Page 39)

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Analog Output Gain
This setting controls the sensitivity of the two analog outputs on the ACMI. The
output level for the two channels are proportional to the measured power in
the forward and reflected directions. The output range is 0 to 5.0 V with 10 bits
of resolution. The gain settings allow the adjustment of the range at the cost of
resolution.
Example - At a gain of 1, the resolution is approximately 0.12% of
full scale. At a gain of 8 it is approx 0.015% of full scale.
The tables below show the forward and reflected range and resolution for the
100 W and 500 W ACMs for the various gain settings:
Table 1-1 100 W ACMI
Gain Max (W) Resolution (mW) Max (W) Resolution (mW)
1 125.00 122.0703 12.50 12.2070
2 62.50 61.0352 6.25 6.1035
4 31.25 30.5176 3.13 3.0518
8 15.63 15.2588 1.56 1.5259
Table 1-2 500 W ACMI
Gain Max (W) Resolution (mW) Max (W) Resolution (mW)
1 625.00 610.3516 62.50 61.0352
2 312.50 305.1758 31.25 30.5176
4 156.25 152.5879 15.63 15.2588
8 78.13 76.2939 7.81 7.6294