WMR88 Pressure Graph

[Mortgun]

When I view the pressure graph, the steps in the graph are .03 inches (.762mm). Yet when I view the thumbnail graph it has the pressure changing in .01 inch steps (.254 mm). So the large rectangular steps in the pressure graph are shown as 3 steps up and 3 steps down (forming a peak) in the small graph.

Why doesn't the large graph show the same resolution as the small graph?

[steve]

The WMR88 has a resolution of 1 mb, which is (approximately) 0.03 inHg, so that's why the large graph goes in steps of 0.03 inHg.

I don't know how the small graph is apparently showing 0.01 inHg steps, it's exactly the same data but plotted only every 10 minutes instead of every 1 minute. Can you upload (or link to) the images so I can see what you mean? I've switched my test system with my WMR200 over to inHg and reduced the period to 6 hours, and the two graphs look exactly the same:

Graphs_2012-06-19_20-03-06.png

You're never going to get particularly good pressure graphs from an Oregon Scientific, particularly over short periods of time, because of their poor resolution.

[steve]

Oh, hold on, I think I know what you're referring to:

WMR88 Pressure Graph_2012-06-19_20-30-26.png

The thumbnail isn't actually showing more resolution, it's just that there aren't enough horizontal pixels for it to draw a smooth diagonal line. There are still only two pressure values being plotted on that graph, 30.06 and 30.09.

[Mortgun]

Thank you. That is exactly what I was referring to.

I replaced my LaCrosse 2308 with the WMR88. My new PC didn't have a serial port so I bought a serial to USB adapter for the LaCrosse 2308. After I had it connected with the adapter, I started getting readings like 544 mph wind gusts, 822 inches of rain in one day, 106 degrees F on a day in January. That's why I bought the WMR88.

I hated to replace the 2308 because it was completely reliable and very accurate (except for those occasional crazy readings).

So far, I'm very unhappy with the WMR88. My wind instruments are not being received even though they are 40 feet away from the base unit and I don't trust the readings I'm getting from the rain gauge. The Larosse unit never required anything other than installation and it was better constructed. than the WMR88.

Now, one more question. When I look at the graphs, the inside temperature graphs are identical for the small and large graphs. The small outside temperature graph shows 12 hours of readings, but the large graph shows more than 36 hours. The large graph only shows the most recent 12 hours on the right side of the graph. Is this due to the WMR88 not having a data logger?

[6719jason]

Hi there,

Sorry to hear you are experiencing issues with your WMR88.

As an Official Tester of this Station, I'm surprised that you are encountering the issues stated.

I would suggest pairing the Station Sensors with the Base Unit while near the Unit and then moving the Sensors to their appropriate locations.

Fresh New Batteries are a must for any Wireless Station.

Any further issues, feel free to check out my blog or email me.

Many thanks

[steve]

The small outside temperature graph shows 12 hours of readings, but the large graph shows more than 36 hours. The large graph only shows the most recent 12 hours on the right side of the graph. Is this due to the WMR88 not having a data logger?

I can't work out what you're saying, can you show some screen shots, please?

You have to run Cumulus (or any other software) 24 hours a day with the WMR88, or you will lose data. The fact that you're not getting any wind readings will cause problems with Cumulus in general, though. It relies on them as a 'the station's working correctly' check (which can be overridden in the latest builds).

[Mortgun]

I have attached a screen shot of the outside temperature graph. The only data the large graph shows is what is currently in the small window.

Note the windchill on the lower left

I also put new batteries in the unit. It responds to the wind sensors when the base unit is within 20 feet of the sensors.


I'm thinking of installing an old PC with a comms port and switching back to my LaCrosse 2308.

[steve]

Note the windchill on the lower left

I think that's the problem; because of your anemometer issue, the wind chill graph isn't getting the old entries removed as it would when new points are added to the graph.

[Mortgun]

Is that why the large graph only has the last 12 hours?

Thanks for all of your help.

Ed

[steve]

Is that why the large graph only has the last 12 hours?

Yes; you've set the period to 12 hours, so it's doing that correctly for most of the plots on the graph. The wind chill isn't getting plotted all the time, so the old values aren't getting removed. You could right-click on the graph and remove the wind chill plot.