Originally Posted by RickD_99
I just bought a used X-rite i1 Pro Rev D spectro off of ebay. Unfortunately it did not come with the weighted accessory that attaches to the device that allows it to be hung over the display being calibrated. Does anyone know a source for purchasing this accessory? So far I have searched the X-rite site, Google, and Amazon without success.
Mounting the i1PRO to an OLED or to any display is not a good idea, it's better to use the tripod mount accessory and take only non-contact measuremnts.
EBU TECH.3325 Publication (Methods for the Measurement of the performance of Studio Monitors) recommends the distance measuring geometry rather than the contact method.
If you have 10cm distance (or larger) from the panel it will be good, we don't need the panel to transfer it's heat to the meter. Usually users confuse warm up (it's doesn't mean to let the meter on-contact with the display to become warmer from display's hear, warm up means the meter to be connected and powered from the USB, not become warm from the panel..just leave their USB plug connected with your notebook for some time before starting measurements. The recommended warm up time is about 20-30 min. The exact time depends from the temperature conditions. It can be longer if the device came from out side in winter time and will be shorter if stored at room temperature.
If you check JETI, PhotoResearch,Minolta, reference meters, none of them is measuring in contact mode.
Hi-end spectro's with 1/2° can't measure in contact mode without specific accessory attached.
For example Minolta CS-2000A min. measuring meter placement distance is 35cm (or 5,5 cm when using close-up lens).
-680 needs 10 foot (3.05 m) long probe designed for contact measurements of luminance to provide 13.2 mm measuring area.
For example, my Klein K-10A without any accessory attached, with 10cm distance from the panel it measures an area of 5cm (FOV), to measure the same area with my JETI 1211, I have to place it with 161cm from the panel.
JETI 1211 has 1.8° FOV and is closer to SMPTE recommendation from any other instrument.
SMPTE recommends to take readings from the viewing position, but that's is not possible for the consumer probes, you need an instrument with ~2.0° field of view.
Also there some published documents that suggesting to measure about 100 pixels minimum for display calibration which is not possible for some meter in contact mode.
A high-end spectro with a viewing optics (like PhotoResearch or Minolta) or with laser aiming (like JETI) with narrow viewing angle for this job.
As you can see from the following Chart (created by <^..^>Smokey Joe), the JETI (1.8°) is closer to SMPTE recommendation from any other instrument.
The display need some warm up period also, about one hour, to stabilize, LG OLED's; the first minutes ares darker (higher gamma) until about 40-50 minutes the gamma will be changing....about 50-60 minutes...they are more stable.