Bug in getting uSv per hour

[Wikilicious]

Currently, get_usv_h() is coded simply as µSv/h = (CPM / CalibrationCPM_1) * Calibration_uSv_1
However, after recently getting a GMC-600+ I noticed the uSv/h values a bit off from what I was seeing on the device display.

Unlike the GMC-300S who's CalibrationCPM_0, CalibrationCPM_1, CalibrationCPM_2 (and corresponding uSv) all produce an identical result...

Other device models seem to use multiple calibration points... Seems like it's not a linear response between CPM and uSv/h.

Now the question is... how does GQ calculate the displayed uSv from the calibration values in the config?

[Wikilicious]

Posted question on GQ support forum
https://www.gqelectronicsllc.com/forum/topic.asp?TOPIC_ID=10435

[Wikilicious]

Did some empirical testing on a GMC-300S (GMC-300SRe 1.14)

|              | CPM   | uSv  |  | CPM   | uSv  |  | CPM    | uSv  |  | CPM    | uSv  |  | CPM  | uSv  |  | CPM     | uSv   |  | CPM     | uSv   |
| ------------ | ----- | ---- |  | ----- | ---- |  | ------ | ---- |  | ------ | ---- |  | ---- | ---- |  | ------- | ----- |  | ------- | ----- |
| Calibration0 | 50    | 1    |  | 25    | 1    |  | 25     | 2    |  | 25     | 2    |  | 100  | 4    |  | 100     | 4     |  | 100     | 4     |
| Calibration1 | 100   | 4    |  | 100   | 4    |  | 100    | 4    |  | 100    | 4    |  | 25   | 2    |  | 25      | 2     |  | 25      | 2     |
| Calibration2 | 32300 | 200  |  | 32300 | 200  |  | 32300  | 200  |  | 200    | 32   |  | 200  | 32   |  | 200     | 32    |  | 200     | 32    |
|              |       |      |  |       |      |  |        |      |  |        |      |  |      |      |  |         |       |  |         |       |
|              | CPM   | uSv  |  | CPM   | uSv  |  | CPM    | uSv  |  | CPM    | uSv  |  | CPM  | uSv  |  | CPM     | uSv   |  | CPM     | uSv   |
|              | 55    | 1.3  |  | 27    | 1.08 |  | 25     | 2    |  | 25     | 2    |  | 25   | 1    |  | 209     | 33.54 |  | 101     | 15.03 |
|              | 63    | 1.78 |  | 39    | 1.56 |  | 26     | 2.03 |  | 27     | 2.05 |  | 26   | 1.04 |  | 251     | 40.74 |  | 117     | 17.77 |
|              | 73    | 2.38 |  | 56    | 2.24 |  | 35     | 2.27 |  | 34     | 2.24 |  | 31   | 1.24 |  | 433     | 71.94 |  | 124     | 18.97 |
|              | 81    | 2.86 |  | 64    | 2.56 |  | 43     | 2.48 |  | 46     | 2.56 |  | 37   | 1.48 |  | 478     | 79.66 |  | 131     | 20.17 |
|              | 98    | 3.88 |  | 87    | 3.48 |  | 67     | 3.12 |  | 56     | 2.83 |  | 54   | 2.16 |  | 544     | 90.97 |  | 142     | 22.06 |
|              |       |      |  | 99    | 3.96 |  | 78     | 3.41 |  | 65     | 3.07 |  | 66   | 2.64 |  | 614     | 103   |  | 159     | 24.97 |
|              |       |      |  |       |      |  | 89     | 3.71 |  | 75     | 3.33 |  | 75   | 3    |  | 717     | 120.6 |  | 168     | 26.51 |
|              |       |      |  |       |      |  | 99     | 3.97 |  | 87     | 3.65 |  | 86   | 3.44 |  | 806     | 135.9 |  | 179     | 28.4  |
|              |       |      |  |       |      |  |        |      |  | 98     | 3.95 |  | 99   | 3.96 |  | 294     | 48.11 |  | 191     | 30.46 |
|              |       |      |  |       |      |  |        |      |  |        |      |  | 22   | 0.88 |  |         |       |  | 200     | 32    |
|              |       |      |  |       |      |  |        |      |  |        |      |  |      |      |  |         |       |  |         |       |
|              |       |      |  |       |      |  |        |      |  |        |      |  |      |      |  |         |       |  |         |       |
| Slope        | 0.06  |      |  | 0.04  |      |  | 0.0266 |      |  | 0.0267 |      |  | 0.04 |      |  | 0.1714  |       |  | 0.1714  |       |
| Intercept    | \-2   |      |  | 9E-16 |      |  | 1.3365 |      |  | 1.3323 |      |  | 0    |      |  | \-2.291 |       |  | \-2.287 |       |

Observations:

• Order of calibrations matter (intended to increase CPM every calibration level)
• The calibration CPM is treated like a max-CPM (if cpm is higher, then it goes to the next calibration)
• The response curve is linear and only valid for the config interval range.
• Once the CPM exceeds the max calibration point, uSv is extrapolated based on the highest calibration point.
• After the first calibration, further calibration points are treated as slope-intercept form calculated from the last calibration and current.
• Nuances when calibration CPM points are not in increasing order.

[Wikilicious]

Bug resolved... to the best of my knowledge... in 11d6726