First run - help - temp jumping


 
S

Sean.Can

New member
I started my first run with my new heatermeter as just a thermometer and my food temp was jumping up and down by as much as 10 degrees. I am using maverick probes and they work fine in my maverick. What's going on? I put it in my oven to get a screen shot of the graph jump around.

http://imgur.com/A2LvELQ
 
Sean-

You are having the same issues I am. Noise appears to be affecting the probe readouts. Here's mine:

oIzS6Dw.jpg


Read some posts around here:
http://tvwbb.com/showthread.php?45777-Post-your-live-HeaterMeter-Cooks&p=641727&viewfull=1#post641727

I got a second probe and I'm still seeing noise. Folks have suggested this could be the power supply. That's going to be my next test to see if I can resolve.
 
AWESOME! That info pointed me in the right direction. i didn't realize the little yellow graph on the probe temp meant noise. After some experiments i think i have determined that it is a grounding issue on that one probe, it must have been water damaged or something crushed in the cable maybe. Oddly to spite the fact that the noise stays the temp swings smooth out after 180-190 degrees. Simple enough to fix, just have to order a new probe, are the thermoworks ones better than the maverick ones? Thanks again!
 
Sean, go with the Thermoworks. That is what I am now using and I love them. Price is not bad and they are a much better quallity. Good Luck
 
What HM version are you running? (v4.2 added noise filters on the probes, v4.1 was quite a bit more susceptible to noise) If they're Maverick 732 probes they may indeed have grounding issues, and or, the plug on 732's is a bit too long so insert them until they click in place but don't push them fully in. On the grounding, if you touch the braided wire on the 732 to something that is grounded (another probe braid that IS grounded is the easiest but any exposed metal part of the HM/rPi should do) that might eliminate the noise.

As for probes in general, I much prefer the Thermoworks Pro Probes over Maverick. TW Pro have a bead that seals out moisture which makes them much more durable than the Maverick probes. I've had TOO many Maverick probes die due to moisture and I've basically given up on them. The only thing Maverick had on TW is their High Heat probe could endure temps a bit over 700F while TW probes top out in the 500's, since I went with the Thermocouple Pit Probe that is a non-issue... Also, Maverick offers 6ft cables while TW are shorter, which I thought at first was a negative, but after dealing with tangled longer cables I've come to like the shorter ones.
 
Sean,

Thermoworks are better probes but I'm still having noise issues using them. I just now switched over to a battery pack and my noise issues went away immediately. I'm pretty sure this is a power supply issues as others were hinting at me earlier. They recommended to try a transformer power supply rather than the cheapo switching power supplies I bought from amazon for $6.
 
If i put the probe in boiling water and then put the pot on wood the (isolated from ground) noise goes away. If i touch the braided shield to the casing around the usb ports it also goes away and it is only with this one maverick probe out of 3 so i am inclined to think it is the probe, it has seen a lot of cooks and a lot of abuse so it doesn't surprise me :) The version i am run is 4.2, I think the noise is just too high to filter, it usually sits around 7 or 8. I will certainly try a cleaner power source, i think i may have a 120v-12v step down transformer and rectifier at work somewhere, if i can find it maybe i'll put something together for testing. Thanks for the advise everyone.
 
Like I said, try grounding the braid on the Maverick probe lead to something, see if that helps? Otherwise a better power supply (and/or new working probes) is what you should look into. You don't want to simply step down 120VAC to 12V and rectify, you want a fully regulated and filtered power supply... I would look around for a 12VDC wall wart in the older heavier style that is rated for at least 1A or more, lots of old cordless phones, answering machines, routers etc used 12VDC power supplies, you probably have something sitting around... The plug on the HM power jack is also extremely common, just make sure the output of the power supply you use is TIP POSITIVE 12VDC.
 
Tony L-Iowa said:
Sean,

Thermoworks are better probes but I'm still having noise issues using them. I just now switched over to a battery pack and my noise issues went away immediately. I'm pretty sure this is a power supply issues as others were hinting at me earlier. They recommended to try a transformer power supply rather than the cheapo switching power supplies I bought from amazon for $6.
Click to expand...

Same here, maybe some sort of an inline power filter would help.
 
RalphTrimble said:
Like I said, try grounding the braid on the Maverick probe lead to something, see if that helps? Otherwise a better power supply (and/or new working probes) is what you should look into. You don't want to simply step down 120VAC to 12V and rectify, you want a fully regulated and filtered power supply... I would look around for a 12VDC wall wart in the older heavier style that is rated for at least 1A or more, lots of old cordless phones, answering machines, routers etc used 12VDC power supplies, you probably have something sitting around... The plug on the HM power jack is also extremely common, just make sure the output of the power supply you use is TIP POSITIVE 12VDC.
Click to expand...

Yep, 12v transformer fixed mine.
 
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