WatchUSeek Watch Forums banner

1 - 13 of 13 Posts

·
Registered
Joined
·
22 Posts
very seldom.. i only did it once so far, seldom use the attitude sensor actually. temperature sensor was just to see how cold the lecture hall is! :)
 

·
Registered
Joined
·
120 Posts
Discussion Starter #3
sorry, i musnt have been clear about my question. what i mean is, how often do you notice the alti/baro readings of your riseman (yes, the new one, gw9200) are wrong and that you need to calibrate them?

and thanks for the link. now i can read more before i get me my riseman :)
 

·
Registered
Joined
·
6 Posts
just once, calibrated the baro meter accouring to the hPa online.. but wasn't sure after that whether it is the actual hPa near or around my area. coz just following the nearest city to my place.

no information regarding the altitude on where i'm currently.. so dare not touch it. one thing for sure, you have to be confident and trust your watch after you have calibrated it.. i still wondering whether i've did the right thing or not.. :oops:

just my personal experiece. ;-)

rgds,
twei
 

·
Registered
Joined
·
8,522 Posts
due to air pressure rise/drop, I calibrate the altimeter every morning, sometimes 3-5 times per day if necessary.

the barometer is affected by temperature changes and therefore pointless to calibrate. however, if you wear the watch and keep temperature roughly between 22 - 32° celsius, a change won't be necessary. it might will be off sometimes by 1 or 2 millibars (hpa) but thats it. if the watch is not worn (e.g. attached to a backpack) and is exposed to the bright hot sun, - or opposite - to the cold air, you will have to add/subtract a few millibars by the rule of thumb, therefore its best to keep it onto your wrist.


regards, holger
 

·
Registered
Joined
·
35 Posts
The altimeter data are often wrong, you can calibrate somewhere climb up or down and you are wrong from more than 50 meters. Here in France we have very precise map with lot of elevation information (1cm on map=250 meter on field) so we can check at every step of a moutain walk.
But if you use your GW9200 to get an average climb by day the value are quit correct (less than 15% error).
To get good elevation data , buy a good GPS like Garmin 60Csx, you get elevation everywhere with 20-30 meters precision.
 

·
Registered
Joined
·
244 Posts
i got access to highly precise weather equipments located across the country. whenever i go to one of those sites, the one thing i always do is to compare my gw9200 against the equipments. gives me an idea of how the riseman performs at different altitude, temperature, wind, humidity and pressure zones.

it was vary accurate from the day i got it, and it has never let me down

:-!
 

·
Registered
Joined
·
1,057 Posts
I noticed that the temperature reading of the Riseman is considerably off from those of my DW-9600 and PRT-60 (10 years old, two battery replacements each), somewhere around 2-4°C at normal room temperatures.

When I place all three into the fridge, the temperature difference was almost insignificant (<1°). Since the Riseman provides similar results as two consumer weather stations, I am quite unsure which of the watches are providing incorrect readings. But calibration seems hardly useful due to the non-linear deviation.

Since I use the riseman sensors primarily for the barometric graph, I don't care too much about the actual values.
 

·
Registered
Joined
·
244 Posts
............I noticed that the temperature reading of the Riseman is considerably off from those of my DW-9600 and PRT-60 (10 years old, two battery replacements each), somewhere around 2-4°C at normal room temperatures...........
comparing it to other watches is not a good practice. u've gotta compare it with some kind of calibration reference, which is certified to be accurate.

here's how i did mine


 

·
Registered
Joined
·
244 Posts
good point,

its often far more interesting to see the specific trend, than to be accurate down to one 1hpa (though thats very nice).


regards, holger
thats right :-!

the graph is the most important thing. pressure never is measured for numerical value, it's the trend that tells you the weather pattern.
 

·
Registered
Joined
·
6,194 Posts
due to air pressure rise/drop, I calibrate the altimeter every morning, sometimes 3-5 times per day if necessary.

the barometer is affected by temperature changes and therefore pointless to calibrate. however, if you wear the watch and keep temperature roughly between 22 - 32° celsius, a change won't be necessary. it might will be off sometimes by 1 or 2 millibars (hpa) but thats it. if the watch is not worn (e.g. attached to a backpack) and is exposed to the bright hot sun, - or opposite - to the cold air, you will have to add/subtract a few millibars by the rule of thumb, therefore its best to keep it onto your wrist.


regards, holger
Just wonders, has it been confirmed yeat that the Riseman's barometer is not temp compensated?

Apprently the PRG-80 seems to have it while the new PAW-1300 and 1500 does not... But perhaps the Riseman does?
 

·
Registered
Joined
·
8,522 Posts
Just wonders, has it been confirmed yeat that the Riseman's barometer is not temp compensated?

Apprently the PRG-80 seems to have it while the new PAW-1300 and 1500 does not... But perhaps the Riseman does?
well, the GW-9200 seems to have kind of a temp compensation, but it works rather slowly and only in a certain temperature scale. that means give it enough time to acclimate and it will come back spot on, as long as it was worn on your wrist and kept above 22° and under 33°.

however, last night I let it outside for temperature measurement and this morning it showed 11,1° celsius and 1008 hpa. the barometer was off then by two hpa, it was actually 1006 hpa. however, the TC - while not perfect - works alot better than in the PAW-1300 series, where it seems not to work at all.


regards, holger
 
1 - 13 of 13 Posts
Top