Products > Test Equipment
General Eastern Optica (Chilled Mirror Hygrometer)
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dcmxx:
By the way, I have the Edgetech Dewprime  manual if someone needs it
Anders Petersson:

--- Quote from: dcmxx on April 20, 2023, 04:59:03 am ---I'm looking if someone knows how to access the calibration parameters of the GE Optica.

--- End quote ---

I wondered about this too. The datasheet states somewhere that the sensors are interchangeable, and there's no digital comm with the sensor, so I think there's only the factory calibration.

I looked in the Java source code, and the user can set an offset for DP, temperature and pressure. And there's the general feature of user equations. But no mention of any other calibration.

Any adjustments are probably best done on a PC. I do the conversion from DP to RH on a Raspberry Pi anyway, using TMP117 for temperature as that is more accurate than the PRT of Optica.


--- Quote from: dcmxx on April 20, 2023, 04:59:03 am ---There's a hidden menu accessed pushing the lower blue button and the number two on the main screen. This shows another screen with a password field and some comment fields, but i haven't progessed any further

--- End quote ---

No idea, sorry.

BTW: If someone has the software for GE Humilab Relative Humidity Generator, please let me know.
ew2097:

--- Quote from: Anders Petersson on March 15, 2023, 10:29:35 am ---And the settings don't stick for me anyway.

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regarding this, we just sent a few units out to Panametrics for their calibration service, and one unit we had would keep reverting the data field that we had set to display Fahrenheit back to Celsius every time we restarted it.  It was that same unit I mentioned before about changing from IDE to AHCI to continue past that "jumping to" error.

Upon receipt of the calibrated units, I noticed they had commented about incorrect BIOS settings and the hard drive mode was set back to IDE.  I don't know what else they may have changed, as I neglected to catalog all the bios settings it had before we sent it out (whoops).    BUT there is a non-zero chance that this may be the reason the unit wasn't saving the changes we would make to the data fields since the Fahrenheit line now persists after powering off.  I will eventually be documenting these bios settings and I can share them if it might help.


Also, it's very frustrating that end-users were locked out of the service/calibration options on these units, as it guarantees a revenue stream for GE/BH or any other calibration houses.  We have the means to do in-house calibration with traceable standards, and it would save us a lot of time and hassle to be able to do it ourselves.  The Optica models with the 4x40 segment display lets you access the calibration menu ONCE for every fresh power-on session; you can navigate down to the bottom of the settings menu and get into it, go through all the RTD points for building its internal reference table, adjust Vout zero and span, etc... but it wont save any of it, and once you exit the calibration menu, it's inaccessible until a full powercycle.


--- Quote from: dcmxx on April 20, 2023, 04:59:03 am ---There's a hidden menu accessed pushing the lower blue button and the number two on the main screen. This shows another screen with a password field and some comment fields, but i haven't progessed any further
--- End quote ---
I didn't even know about the VGA optica's hidden menu, and it seems you can only access it via the front-panel keys; I've got a USB keyboard plugged in for slightly better navigation but holding that lower blue button and pressing "2" on the keyboard does nothing.  That blue button is the Left arrow when you're in the menu, but holding Left and 2 on the keyboard also does nothing.  To be honest, I dont even know if that hides any kind of calibration settings in the first place.   Where/how did you discover this menu?

The later Optisonde models (non windows based) allow you to adjust Vout trim/span as a user setting, so that's nice but they still bury calibration stuff behind a password menu.  It's only four characters, 0000 - 9999, so you could technically brute force it, but who has the time and patience for that?




--- Quote from: Anders Petersson on April 20, 2023, 06:48:02 am ---The datasheet states somewhere that the sensors are interchangeable...
--- End quote ---

The sensors do seem to be interchangeable... older GE 1200 series readouts used to come with a table of resistance values for a range of temperatures specifically matched to a given sensor and you'd have to enter those into the readout, but these optica and optisonde models have had consistent results whether we're using 1211H, 1111H, or SIM-12H.  Maybe the variance in PRT units from one sensor to the next is negligible...
It's still important to adjust the set-screw for the balance circuit whenever you pair a sensor with a readout... the manual explains the process, but the short version is:
- take the lid off the sensor
- set the readout to "Heat" mode and let it heat up for a couple minutes (temp will read anywhere from low-100s to nearly 200 degF)
- clean the mirror with a cotton swab and non-solvent cleaner (isopropyl is fine), then wipe with a dry swab (it's just easier to do this when the mirror is warm rather than cool)
- cover the mirror cavity to prevent light affecting the optics
- adjust the set screw until the vertical balance bar on the display has one segment filled (on the VGA models, it's just the bottom quarter inch, on the 4x40 models I believe it's just one out of the 10 possible segments)
(- on Optisonde units, you line up a checkered square behind a solid square in the center of the balance bar)

After that, let it cool back down for a minute, run a pacer cycle, and you should be good to go...
dcmxx:
This is the hidden screen. If anyone has the password please let us know. I found the hidden screen just messing with the instrument, but i haven't had time to continue.

I was using a SIM12H sensor, now I got a 1211H that i will try soon, maybe the SIM12H was kind of bad

I also have the problem that the config files doesnt show or the data logging files, even if they exist.
Anders Petersson:
Checking the hard drive contents, there's no password menu in the Java web applet.
I do see mentions of 'password' in NK.BIN (both in ASCII and UTF-8) but I'm not curious enough to attempt to disassemble and figure out what the code does.

I still have the ambition to figure out the web API to change settings some day. That should enable complete remote control and ditching the clunky embedded user interface.
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