Thermistor reading clamped at -17 deg C

Hi signal conditioning experts.
I am measuring several thermistor temperature channels using an SCXI-1503 connected to a PCI-6221.
The thermistors when open circuit (i.e. not connected) read approximately -17.7 deg C, but when the thermistor is connected the temperature reading is correct.
All was well, I thought, until I tried to measure a temperature below -17.7 deg C, and then the reading stayed clamped at this temperature of -17.7 deg C.
The task is set up in MAX, and the minimum range is set to well below -17 deg C so this is not it. Any ideas what may be the problem?
nrp
CLA

Hi again NRP
Thank you for your patience. I have now two options for you in regards to solving this problem.
1. The SCXI-1503 as we know can only handle a thermistor up to 100 k ohms, this is why your thermistor was saturating at -17.7 deg, as although your thermistor can produce 600 k ohms (temp of -50 deg C), saturation occurs at 100 k ohms; at -17.7 Deg C. So one solution is to change your value of thermistor to one with a low recording working temperature range but no more than 100 k ohms. I have found an external pdf doc for you to see the types of thermistors that are calibrated with low temps involved. One such resistor can record temperatures to -44 Deg C with a resistance of 99.26 k ohms. (Within 100k ohm range of SCXI module) and will allow you to record the low temperatures you require. I have included a link to this thermistor below. (Model Number 44004 - first column)
http://www.omega.com/temperature/Z/pdf/z256-257.pdf
2. Use an external excitation source that will neglect the low working range of the SCXI module and can handle the 600 k ohm thermistor value. However a problem with this is a phenomenan known as 'self-heating' which can introduce large errors into your equation. The level of the voltage output signal depends directly on the thermistor resistance and magnitude of the current excitation. Do not use a higher level of current excitation in order to produce a higher level output signal because the current causes the thermistor to heat internally, leading to temperature-measurement errors. (Self heating) I have included the manual for your viewing below. With reference to page 4-12 ; self-heating errors.
http://www.ni.com/pdf/manuals/374271a.pdf
I hope this offers a solution to your problem, please let me know how you get on. Many thanks.
Many thanks for using the NI forums and I look forward to your reply.
Kind regards
David
Applications Engineer
National Instruments UK

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chassis with labview 8.2 installed. I would like to use a PXI-4351
board to measure a thermistor. I am using the sample vi on the ni web page http://zone.ni.com/devzone/cda/epd/p/id/838, but I get an error code -10846 "AI buffer read" after a few acquistions. I am new to Lab view --- what does this mean and how do I fix it?

Well, I don't have ready access to a LV PC and for some very odd reason, my attempt to search for "error code" (and even just plain "error") on the ni website returned 0 hits?!? Strange...
Anyhow, I'll take a guess and offer you an idea for a workaround. Could your error mean that your call to AI Buffer Read times out before the requested # samples have been taken? This kind of error wouldn't be surprising as it's difficult to determine a reasonable timeout value. Based on my own past experience with a 4351 board, I'd say that the whole notion of "sample rate" turns into something of an odd duck.
As I recall, all you can specify is a filter frequency which will establish a ceiling for your actual sample rate. However, the board also has some sort of criteria for signal stability. If you have several different channels to measure which use different input ranges, your actual sample rate can be reduced pretty dramatically. So you might get a few samples per second or a few seconds per sample.
The workaround I used was to always request data that had already been collected and was immediately available. One of the inputs to the AI Buffer Read lets you set some parameters where you can specify that you want to read the most recent sample that's already in the buffer. Granted, this may represent a temperature from a second or two ago, but this lag is not necessarily a major issue for temperature measurements.
Note: in my app, I could query for Temperature any time I wanted, as frequently as I wanted. I would always get data back, but there was no guarantee that I'd get *unique* data back. In other words, if I called it 10 times in a tight loop, I might get the exact same sample # back each of those 10 times.
-Kevin P.

IPhone 6, 6 photo direction 180 deg error

I have an iPhone 6+ and my wife has an iPhone 6. On both phones, when using the built in camera app, the direction of the photo as reported in the metadata is 180 deg off. For example, if I take a photo in the facing North the metadata is decoded as South by Lightroom. A photo taken facing West is reported as East by Lightroom. This error is present in both landscape and portrait orientation.
If I take a photo with my old iPhone 5S (currently used as an iPod) the compass direction as reported in Lightroom is correct.
Anyone else seeing this problem?

Update....It appears the problem started with iOS 8. My images taken on my iPhone 5s after installing iOS 8 are also 180 deg out. Those taken with iOS 7x are correct.
I have reported this via feedback for the iPhone.

Thermistor reading clamped at -17 deg C

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