EL-2800M-USB / EL-2800C-USB- 52 -8. Other functions8.1 Black level controlThis function adjusts the setup level.Variable range: -256 to 255 LSB (at 10-bit output)8.1.1 Black Level SelectorThe following factors can be set.EL-2800M: DigitalAll/Tap1All/Tap2All/Tap3All/Tap4AllEL-2800C: DigitalAll/Tap1All/Tap1Red/Tap1BlueTap2All/Tap2Red/Tap2BlueTap3All/Tap3Red/Tap3BlueTap4All/Tap4Red/Tap4Blue8.1.2 Black LevelThe black level can be set in the following range.EL-2800M: DigitalAll:-512~ +511Tap2All:-512~ +511Tap3All:-512~ +511Tap4All:-512~ +511EL-2800C: DigitalAll:-512~511DigitalRed All/DigitalBlue:-512~ +511Tap2All/Tap2Red/Tap2Blue:-512~ +511Tap3All/Tap3Red/Tap3Blue:-512~ +511Tap4All/Tap4Red/Tap4Blue:-512~ +5118.1.3 Black Level AutoThe tap balance of black level can be adjusted.It is required to close the lens iris or cap the lens in order to cut the incident light.OFF: Adjust manuallyOnce: Adjust only one time when this command is set.8.2 Gain controlThe EL-2800M-USB can adjust the gain level from 0dB to +30dB using 0dB as the reference (Factorydefault). In the EL-2800C-USB, the master gain can be adjusted from 0dB to +27dB and R and B gainscan be adjusted in the range of -7dB to + 13dB using the master gain as the reference.Resolution:Master Gain: 0.035dB/StepBlue/Red Gain: x0.00012 /StepThe master gain uses both analog gain and digital gain internally. All digital gain has the resolutionof x0.00012/Step and provides more precise gain setting.