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mgl:moncalib [2020/10/14 21:06] |
mgl:moncalib [2023/12/09 09:26] joshwilson |
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| Basically there is about 2-3 secs time window you should press 'return' to get to this state. | Basically there is about 2-3 secs time window you should press 'return' to get to this state. | ||
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| + | ==== Notes on PR650 ==== | ||
| + | Over the years, we've run into a few issues calibrating with the PR650. While it's the best photometer we have, it can be quite finicky and frustrating. Here are some things to keep in mind and to try when things go wrong. | ||
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| + | * Before each test measurement, or a run of the calibration, you probably need to unplug/replug the photometer and power cycle it. Otherwise, the "CMD B" interface might not pop up. If you are having trouble getting CMD B, unplug, replug, and power cycle. | ||
| + | * Weak light signal error: For some reason, the PR650, crown jewel of the photometer world, doesn't do a very good job making measurements in low light conditions. When the luminance is very low (e.g. at the beginning of the calibration when the screen starts off as black), it will give you an error that reads "Weak light signal" followed by a luminance value. That luminance value is a lie: it is made up, and when running moncalib, the program will treat it as an error and be unable to continue iterating through different luminances. If you are running into this issue, run moncalib with the flag "fastSearch=1". At the beginning of the calibration, this will find the lowest luminance at which the photometer is able to make a legitimate measurement, and then calibrate with that as the lowest point. This may or may not be a problem for running stimuli with very low contrast - unclear at this point (12/2023). | ||
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| ===== Actual calibration ===== | ===== Actual calibration ===== | ||