DAQmx Custom Scaling Issue

I have created custom scaling for DAQmx. I have the following issue similar to this http://forums.ni.com/t5/Multifunction-DAQ/daqmx-custom-scaling-setup-issues/td-p/805374.
I am scaling a 0 to 5V signal to 0-100 sccm.
the slope is 20 with a Y-intercept of zero.
Everything scales fine up to 1.07V then it displays 21.56 sccm for any measurment above this voltage.
Cant figure out what i am doing wrong. I have verified the DAQ card is measuring volts correctly above 1.07 in NImax.

teslaaaa wrote:
Thats not how i read this:
maximum value specifies in units the maximum value you expect to measure.
minimum value specifies in units the minimum value you expect to measure.
Max values measured is -10 to +10V , If you are correct shouldnt it say "max scaled value" ?
It is the maximum value of the number that will come out of the DAQmx driver. Since DAQmx applies that scale for you, it is post scale value. So you really need to put in 100 sscm for your maximum.
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Custom Scaling Issue

Hardware: I have a SCXI - 1000 being controlled by a SCXI 1600 module. I am reading a voltage into a SCXI-1100 with a SCXI-1303 as a terminal block.
Software: SignalExpress 2.5
OS: Windows XP
Signal Input range is set at -10 to 10 Volt range. I tried to setup a linear custom scale =>
Temp = 233.4(Voltage) - 18
With this scale the temperature maxes out at 28.678, but if I take the scale off the voltage is not capped and keeps moving. Can anyone tell me what is going on?

Hi Jack
Let see if your temperature maxes out at 28.678 that will correspond to a voltage of 0.199 and can infer from your post that without the scale you are able to read more than 0.199 volts.
I have two solutions for you: first you can change the “Signal Input Ranges” to a range including the result in temperature that you are expecting, see how the “scaled units” changes from volts to “custom”. Second you can create a formula to scale the volts to temperature and avoid changing the “Signal Input Range” to the new custom scale.
I hope it helps
Message Edited by Jaime F on 11-07-2007 05:54 PM
Jaime Hoffiz
National Instruments
Product Expert
Digital Multimeters and LCR Meters
Attachments:
input range.JPG ‏114 KB
formula.JPG ‏73 KB

Custom scaling of DAQmx channels

Hello,
I am attempting to set up a triggered acquisition using DAQmx custom scales with 1 virtual channel containing 3 physical channels. What I am trying to acheive is to have independent scaling applied to each physical channel input.
I have attached a snippet of my code - when I examined it in operation, only the last channel in the array is applied to the task with the final array scaling values.
Could anyone give me some advice on how to improve this?
Regards
Dave
Attachments:
customScaling.png ‏66 KB

I am not sure what is happening in your customscaling.vi as you havent posted it.
I would create the custom scales first and apply it while the task is being created as below. You will need to adjust the values as necessary.
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I am a newbie to DIO world.
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Custom scaling of data without MAX?

Okay here's my problem. Hopefully you can help me or offer some helpful advice.
I am creating a user interface for data acquisition (only analog inputs are used). Thermocouples (Type J and Type K) will be used, as well as factory calibrated strain gauges. Some other sensors that can be linearized on a 0-5Volt scale might be used too.
I originally had my program set up where the user had to set up their channels in MAX and then come to the program I made. There will probably be a lot of scale/offset changes made by the users so channel configuration needs to be flexible. I changed the program to custom scaling. Instead of virtual channels the user just enters scale and offset values. These values are saved to a text configuratio
n file and later used on raw voltage.
Then I realized I would have to have the user input what type of sensor they are using because I'd have to compensate for CJC in thermocouples. AND, I dont think the SCC-TC02 is linear.
*Am I right in thinking I will have to use case structures when I finally scale data for LINEAR versus J THERMOCOUPLE versus K THERMOCOUPLE?
*How innacurate would my readings be to use the Labview's Thermocouple scaler VI and set the CJC to 1.25 volts (25 degC) rather than reading from Channel X+8.
*Is there an easier way to do what I'm trying to do? I know people do custom scaling, how is it done?
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I'm not sure I see where your difficulty is.
I have always used custom scaling, MAX never did quite enough.
I have a cluster for each channel. The cluster contains a scaler (EU/Volt), an offset (EU@0V) and a channel type enum, among other stuff (channel name, units, filters, etc.)
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How innacurate would my readings be to use the Labview's Thermocouple scaler VI and set the CJC to 1.25 volts (25 degC) rather than reading from Channel X+8.
<
p>
Depends on which type TC, and where you are on it's range. You might expect 20 degrees or more error at the high end of some ranges, without proper CJC.
There's no easy answer to that question.
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Culverson.com
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DAQmx Custom Scaling Issue

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