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Custom graphs anomaly

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rnbryan:
When I installed a new 21.5" iMac, Davis Instruments WeatherLInk for Mac OS no longer ran. I had been using the standard data logger to periodically upload the Vantage Pro 2 to my old iMac. So I invested in a WeatherLinkIP data logger and connected the output with an ethernet cable to an Apple Airport Express on my local network. After installing WeatherCat 3.0.4 I was pleased to see it running flawlessly. I am not uploading to a web page but using it to monitor my local weather and remote agricultural sensors. The data logger interval is set to 1 minute, so the curves are smooth. There has been, however, an interesting anomaly in the temperature graphs. I'm graphing both interior and exterior temperature at the console as well as a remote temperature sensor in my greenhouse. After being in operation for 42 days, all three temperature graphs showed four square pulses superimposed on the curve. There were three pulses each lasting 2 hr and one pulse lasting a little over 1 hr, each pulse following the other with a 30 minute interval. It looked like a square wave was superimposed on the graphs. The amplitude of the pulse varied with the channel. After the last pulse, the graph reverts to normal. This episode has occurred three times since installation January 1, 2019. The pulse does not coincide with the temperature reported in the WeatherCat Controller. So this anomaly is a signal superimposed on the data channel at the graph. Does anyone have ideas how this happens?

mcrossley:
Wild guess, you have a neighbour with a station on the same channel and you are flipping between your sensors and theirs? Changing your ISS channel would eliminate this possibility.

Blicj11:
As this is your first post, welcome to the forum, rnbryan.

I like Mark's suggestion as a place to start. I also use the Davis WeatherLinkIP™ Data Logger here. And although I am in a fairly remote mountainous area with very few neighbours, when I first installed the data logger I had to play with transmitter IDs in order to maintain a good connection. And then it worked fine for a couple of years. Then I had to experiment with moving my console to a different location on my home network. Eventually it liked whatever I did and has worked fine ever since.

elagache:
Dear rnbryan, Mark, Blick, and WeatherCat troubleshooters,

Let me also welcome you to the WeatherCat forum!


--- Quote from: rnbryan on March 08, 2019, 08:39:26 PM ---. .  .
There has been, however, an interesting anomaly in the temperature graphs. I'm graphing both interior and exterior temperature at the console as well as a remote temperature sensor in my greenhouse. After being in operation for 42 days, all three temperature graphs showed four square pulses superimposed on the curve. There were three pulses each lasting 2 hr and one pulse lasting a little over 1 hr, each pulse following the other with a 30 minute interval. It looked like a square wave was superimposed on the graphs. The amplitude of the pulse varied with the channel. After the last pulse, the graph reverts to normal. This episode has occurred three times since installation January 1, 2019. The pulse does not coincide with the temperature reported in the WeatherCat Controller. So this anomaly is a signal superimposed on the data channel at the graph.

--- End quote ---

If Mark's suggestion doesn't solve your problem, could you please take a screen-shot of the graph and post it for us to take a look at it?  There are details in the graph that might allow us to zero-in on possible causes which cannot be imagined simply from your description.

Once more welcome,

Cheers, Edouard

rnbryan:
There is another Vantage Pro station about 400 meters away, but I doubt the RF signal is strong enough to interfere. There certainly could be interference on the WIFI network as there are a number of devices connected. I extend the network via a combination of Apple Airport Express and Tenda P200 PowerLine Mini Adapters. The ethernet physical layer coexists with the house 120VAC wiring. I've attached a screen shot of a graph with the anomaly.

Thanks for your responses.

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