AVS Special Member
Join Date: May 2008
Location: San Francisco - East Bay area
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If the room is otherwise dark except for the PC monitor, just make sure the PC monitor is well back from the meter so light given-off by the PC monitor is not directed at the meter... distance and reflections will diminish the monitor light enough that it shouldn't be an issue for a flat panel calibration.
You can also turn down the PC monitor's brightness if needed, or even cover the monitor while making readings... much easier than trying to block light from the meter and TV. You really don't want to "cover" a plasma... they emit quite a bit of heat from the vent holes in the back AND from the screen in the front... you want enough open space around the TV for that heat to escape without being trapped.
You need to understand the viewing angle of the meter you are using, You want to calibrate plasma TVs with window patterns and you want the viewing area of the meter to fall inside the window patterns you are measuring so the meter isn't "seeing" a lot of black around the window pattern... you only want the meter to "see" light coming from the window pattern. The viewing angle of colorimeters is all over the map so you can't make any assumptions about how close or how far the meter should be from the screen... you have to KNOW you are at the right distance. For some meters, that could be 6" and for others it could be 3 feet or more.
"Movies is magic..." Van Dyke Parks
THX Certified Professional Video Calibration
Widescreen Review -- Home Theater & Sound