Tesa weather station z215 the pressure graph appears as it should cover 12 hours, however it only coversabout 12 seconds

You are not clear on what your question is but the graph show's you hourly the drop or rise of barometric pressure

I have two of these and they lose the signal occasionally. Per the manual: Make sure all batteries are good and then press the TX button on the remote sensor for 3 seconds so it sends a wireless signal to the weather station. It should beep. Then on the weather station hold the CH button for 5 seconds to make it search for the transmitter until the outside temp appears. Just removing batteries and reinstalling them in various orders doesn't work. You must re-establish the wireless connection between the outdoor sensor and weather station.

Instructions

1. 1
   Press the "Power" button to turn the machine on. The device takes approximately 5 to 10 seconds to fully load.
   
   • 2 Press the "Time" button and hold it down for 8 seconds to begin the setting process for the time. Use the arrows on the left side of the device to select the proper hour and minutes. Use the "Up" button to increase the numbers and use the "Down" button to decrease them.
     
   • 3 Use the arrows to select the time zone that you are currently in. The device automatically adjusts for daylight savings time. Press the "History" button on the right side of the device to view information regarding past weather history.
     

Read more : http://www.ehow.com/how_7571640_sharp-wireless-weather-station-instructions.html

Try replacing the battery in the outside temp transmitter.

Press and hold mode button till hour digits flash then press 12/24 or rcc buttons to change then press mode button but pay attention after time date is updated location will flash then you pick the city. Just don't go to fast or you will miss it! Hope this helps.

To change the time, press the time button. When it goes to 2000, you will see the date flashing. Adjust using up and down buttons. Then press the time button again. You can then use the up and down buttons to adjust the time. Finally, to toggle between F and C, use the up button by itself. To adjust between 24 and 12 hour clocks, press the down button.

The first thing to figure out is the amount of time between the trains is 12 minutes. That would mean for train B to pass the station at 9:37 it would have to travel 22 miles in 12 minutes. Because, traveling at 110 miles/hour in 12 minutes the train would have travel 22 miles. Shown below shows the interpolation to come up with 22 miles.


Train A had to traveled 12 minutes so, it would have been 20 miles ahead of the station. Screened below shows the interpolation to equal 20 miles.


Though this calculation of 20 miles isn't necessary for the parametric solution that is being shown. It was very helpful in my solution in successive approximation. This parametric solution's starting point is at 9:37, not 20 miles ahead.

Using successive approximation, when train A traveled 200 miles in 2 hours, and train B was only 2 miles behind train A. At that point the time varibles needed to be broke down to minutes and seconds which gave me a real accurrate answer. Both trains were side by side in 2 hours and 12 minutes, and had traveled 220 miles from the station. You wouldn't believe how far the significant bits needed to be carried out to get such an accurate number. That's what gave me the idea to substitute, and use a parametric solution. In this solution the t (aka. time) is going to be substituted for the y axis. Next, I broke miles/hour down to mile/minute because, I knew the answer was in minutes: 2 hours and 12 minutes.

110/60=1.833333 so, -20+1.833333 t and 100/60=1.6666667 so, 1.6666667 t

Now load the equation:


Now let's look at the solution from the graph. Each line represents a train.


Notice how the two lines are converging. Where the two lines meet is the exact point when the two trains are side by side.


Substituting t (aka. time) for the y axis show that at the point when the trains were side by side equals 132 minutes. Or 2 hours and 12 minutes. The distance traveled x axis=220 mile from the station.

To a point successive approximation would have been messy, and hard to follow. Somethings can only be solved by using graphs, or better solved by using graphs.

Weather Genius EM3302A Remote Weather Station

Once all settings are complete you press the UP button to toggle back and forth between the 24 hour clock and the 12 hour clock.

I can recommend you on Weatherlink Software but the market offers another good programs.'Weatherlink Software for Weather Stations' -Is a good weather monitoring, connect the Perception II, Weather Wizard III or Weather Monitor II to your personal computer. WeatherLink data logger stores data-even when your computer is not running-until it is transferred to your computer. You can use WeatherLink software to create graphs, calculate totals and averages, generate summaries, analyze trends, and more- all with your own weather database. Data may be exported to most popular databases.

Press and hold the mode button until the year starts flashing in the upper left. Tap the mode button 3 times. You will see "24hr" with the 24 flashing. Press the + or - button on the back. Press the mode button 4 more times (or just leave it alone for about 30 seconds and it will go back to the normal display).