Author Topic: Chart comparing two VP2's one with SHT31 and the other with SHT11 DFARS  (Read 509 times)

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Offline kmahler

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I currently have two VP2's mounted at the same height AGL and within two feet of each other. The first is a VP2 that has been upgraded to the SHT31. The second is a VP2 with the original SHT11 but also fitted with DFARS. Below are a couple of graphs showing the two units over a period of 22.5 hours, midnight to 10:30pm one spring day in Virginia. More specifically, April 15th, 2017. The first chart shows the readings from each station. The second chart shows the delta in higher resolution over the same time period.

I should add that the delta chart is shown in degrees Fahrenheit as I am an American and cannot think in Celsius.

I make no conclusions from these charts, I'm just sharing them for others who share my curiosity.

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« Last Edit: April 15, 2017, 10:51:55 PM by kmahler »
Kevin Mahler
Skywarn Storm Spotter, AKQ3785
CWOP AV286
73 de KO4JY


Offline Old Tele man

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Pardon the punny expression, but looks "...NIGHT and DAY..." to me.
SYS: Davis VP2/WL-IP & Envoy8X/WL-USB
CWOP: DW6988 - 2 miles NNE of Cortaro, AZ
WU - KAZTUCSO202, Countryside

Offline kmahler

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Here are similar plots for the Bar Pressure between the two.

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Kevin Mahler
Skywarn Storm Spotter, AKQ3785
CWOP AV286
73 de KO4JY


Offline kmahler

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Pardon the punny expression, but looks "...NIGHT and DAY..." to me.

Well played!
Kevin Mahler
Skywarn Storm Spotter, AKQ3785
CWOP AV286
73 de KO4JY


Offline mmorris

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So you need to tell me what the Bar has to do with the temp sensor. As the Bar is taken from the console. And if someone slams a door in the house it can change that reading. For what it worth if I cal my Bar it is mostly off in a few hour that is the way it been ever since Davis has had a console with the Bar in it. (weather Monitor II) I still have one sets on the end table just reads inside temp inside hum and Bar.. I just can't believe Davis cal every sensor as they probably take a sensor from a box of sensor and stick it on the board. I've never had a console apart but I just can't see some assembler hooking every sensor and waiting for everything to stabilize and adjusting some pots.
>>Miles<<  By from Portage Lakes, OH.
Been using VWS since 1996 Ver# 14.01P43
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Offline kmahler

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So you need to tell me what the Bar has to do with the temp sensor.

I made no such correlation between the two. I simply shared another graph showing the delta between two stations.
Kevin Mahler
Skywarn Storm Spotter, AKQ3785
CWOP AV286
73 de KO4JY


Offline mmorris

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OK. Carry on

So you need to tell me what the Bar has to do with the temp sensor.

I made no such correlation between the two. I simply shared another graph showing the delta between two stations.
>>Miles<<  By from Portage Lakes, OH.
Been using VWS since 1996 Ver# 14.01P43
Wireless Vantage Pro2Plus Serial Data Logger, Anemo Tran Kit
Win XP, Firefox, WXSIM, Cumulus, NexStorm, Yawcam, VVP, BadBlue Web server, Quake Catcher Net
Follow me on twitter
Vietnam era Veteran USAF bb loader
Quadruple Bypass survivor

 

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