Multimeter auto range

[nicsp]

Hello,

I have a digital multimeter which can be set to different measurement-ranges, like 2mV, 20mV, 2V, 200V and AUTOMATIC.

I have to plot measurement-values on a WaveGraph. The problem is that if the user sets the multimeter to automatic range detection the units (mV, V etc.) and the values differ respectively. Is there a way to automatically recalculate all measure points within a plot automatically by using a factor or do I have to do it "manually" by going through all double-values?

Thanks

[chras]

Could you describe your input values as well as your interface between multimeter and Measurement Studio further?

What kind of format is the data you read in?

regards Christoph

[nicsp]

Hello, yes, I can give you the following example. The multimeter my program is attached to is set to measure voltage in mode autorange. This means if for example measure values come in the range of mV the device is giving me vakues like 10 mV 20.5 mV 30.6 mV 10.2 mV Etc. Then, if necessary (if voltage increases) the multimeter switches the unit due to auto-range to V. Then I get 5.4 V 6.8 V 10.4 V Etc. I am plotting these values on the same plot so in the plot history I have the values in mV and V. If I now change the only the caption of the plot from Voltage mV to Voltage V this is not correct of course since the first few values should be now 0.002 etc. The question is what do you suggest to do in such a case, what would you do? Would you always print only the values relative to the base unit so lates say even if the multimeter is delivering 20mV would you plot 0.002 V or is it somehow possible to say the plot scale down all values a certain factor or maybe also scale up? Thanks for your help

[chras]

After talking to a colleague of mine, we came to the conclusion that there are is no automatic parameterization of scales. This means that the range of Voltage should be fixed because conversion cant be performed automatically. In fact setting the axis to a fix value (e.g. Volt) would be the best solution, accepting that smaller values (mV,..) wont be displayed any more.

As you described in your first post, manually inserting/programming a conversion tool could possibly solve your issue.

Regards chras