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How can I measure veery low voltage with DMM 4070?
cosmin_ro
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05-16-2006 02:15 AM
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I have DMM 4070 and I'm using LabWindows CVI. I have to measure voltage between 0 to 5 mV. How can I get the best measurement for this ?
Mark_W
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05-17-2006 01:54 PM
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Hi Cosmin_ro-
You can use the example program titled "DC Volts". You can find the CVI program from the following location in Windows: Start button >> Program >> National Instruments >> NI-DMM >> Examples >> DMM >> Single Point . You can also find it from your hard drive at the following location: C:\Program Files\National Instruments\CVI80\samples\niDMM\Single Point\DC Volts
The example will acquire a single DC Voltage measurement. You will need to specify the range and absolute resolution of your input signal. The measured value will be displayed in the Measurement indicator.
The lowest range will be 100mV for your 4070 device with a resolution of 100 nV.
I hope this helps. Good luck!
Mark Walters
Application Engineer
National Instruments
You can use the example program titled "DC Volts". You can find the CVI program from the following location in Windows: Start button >> Program >> National Instruments >> NI-DMM >> Examples >> DMM >> Single Point . You can also find it from your hard drive at the following location: C:\Program Files\National Instruments\CVI80\samples\niDMM\Single Point\DC Volts
The example will acquire a single DC Voltage measurement. You will need to specify the range and absolute resolution of your input signal. The measured value will be displayed in the Measurement indicator.
The lowest range will be 100mV for your 4070 device with a resolution of 100 nV.
I hope this helps. Good luck!
Mark Walters
Application Engineer
National Instruments
10-03-2006 03:33 AM
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Is it possible to filter noises ? how can I do this ?
wildcat_600
NI Employee (retired)
10-04-2006 11:51 PM
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Hello cosmin,
The DMM uses many features to help reduce noise. One nice feature is that if you are using the device in DMM mode it takes many very precise measurements and then averages them to help reduce any noise that might be on the line. It also takes the measurements so that it is aligned to the frequency of power supply. This way any small noise that might be on the power line will also be canceled out. Also to make the most accurate measurements make sure to specify the highest resolution possible (for example 6 1/2 or 7 1/2 digits). If any extra noise filtering is desired you could also do some external signal conditioning. Below I've listed two great articles that go into much more detail about how the DMMs work to make very accurate measurements with very little noise. Please let me know if you have any other questions.
Understanding the NI PXI-4071 7½-Digit FlexDMM Architecture
NI FlexDMM Measurement Capabilities
Have a great day,
Brian P.
Applications Engineer
