Linear Gain Adjustment
This gain control scheme allows establishing the gain according to a continuous linear scale.
Simply set the GainCtl parameter to LIN and maintain all involved GainTrim1,GainTrim2 and GainTrim3 parameters to zero.
The gain adjustment uses the Gain parameter and performs as follows:
|
Gain value |
Gain for all camera channels |
|
|
Linear expressions |
Logarithmic expressions |
|
|
700 |
Nominal gain x 0.70 |
Nominal gain -3.1 dB |
|
1000 |
Nominal gain |
Nominal gain |
|
1400 |
Nominal gain x 1.40 |
Nominal gain +2.9 dB |
Once the common gain is chosen for all camera taps (1, 2 or 3), it is still possible to trim an individual tap through the GainTrim1,GainTrim2 and GainTrim3 parameters.
The control resolution for GainTrim1,GainTrim2 and GainTrim3 is not specified. Each unit increment or decrement correspond to the minimal amount of gain alteration the board hardware is supporting.
Setting the GainTrim1,GainTrim2 and GainTrim3 parameters to a positive value increases the gain for the relevant camera tap above the value established by the GainCtl and Gain common parameters. The correction induced by GainTrim1,GainTrim2 and GainTrim3 is simply added to the common gain.
Setting the GainTrim1,GainTrim2 and GainTrim3 parameters to a negative value decreases the gain for the relevant camera tap below the value established by the GainCtl and Gain common parameters.
The minimal and maximal values for GainTrim1,GainTrim2 and GainTrim3 depend on the value assigned to GainCtl and Gain. The limits are in the order of magnitude of ±500.