Adjusting The Nd Offset - Sony HDC-900 Installation And Maintenance Manual

4-7-2. Adjusting the ND Offset

The white balance may be slightly deviated in the ND filters. In such cases, adjust the offset. Taking the
ND filter 1 white balance as the reference, the ND offset stores the deviation of the white balance of ND
filter 2, 3, 4.
Adjusting the ND Offset
(1) Set the setup menu as follows.
[FILE] → [REFERENCE] → [STANDARD]
(2) Connect the waveform monitor to MONITOR OUT connector of this unit.
(3) Select ND filter 4, and shoot the grayscale chart. Check that the illuminant condition is under that
video level is within 560 mV thru. 630 mV. Then note the video level at this time.
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Do not adjust the ND offset if the video level is less than 560 mV.
(4) Select 1 by the ND filter knob, and set the iris so that the video level is the same level as the noted
video level of Step (2).
(5) Execute the auto white balance.
(6) Select 2 by the ND filter knob, and set the iris to meet the noted video level of Step (2).
(7) Execute the auto white balance.
(8) Select 3 by the ND filter knob, and set the iris to meet the noted video level of Step (2).
(9) Execute the auto white balance.
(10) Select 4 by the ND filter knob, and set the iris to meet the noted video level of Step (2).
(11) Execute the auto white balance.
(12) Store the ND offset.
Execute the setup menu as follows.
[FILE] → [OHB] → [STORE|FILE]
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. Adjust precisely to meet the noted video level, otherwise the deviation of the white balance of the ND
filter may generate in some cases.
. If the level cannot be adjusted properly using the iris, adjust the level using the shutter/ECS or gain-up.
Calling the ND Offset
When the ND filter is changed, the ND offset will be called automatically.
Initializing the ND Offset
Execute the setup menu as follows.
[FILE] → [FILE|CLEAR] → [OHB|ND|OFFSET]
HDC-900/950 IMM
4-7. Registering the OHB File
4-11 (E)