PXI-4070 calibration

[DrX]

The calibration procedure for the PXI-4070, 4072 DMM boards states that the ambient temperature must be maintained at 23 +- 1 degree Celsius.  This seems far to stringent and unachievable by most sites. 

Is this a typo?  Does anyone know why this is so much more tighter than other manufacturers specs, even other NI specs.  For example, the 4461 calibration procedure gives a temperature range of 18 - 28 degrees Celsius.

Thank You.

Richard

[wildcat_600]

Hello Richard,

This temperature spec is to optimize the calibration and make sure it is as accurate as possible. This spec is tighter than other instruments because the 407x series is a very high precision instrument and calibration is very important to make very accurate measurements. In order to meet our strict specifications down into the nano ranges it is very important that the DMM is calibrated under the correct conditions. Many times DMMs are used to calibrate other instruments because they are so accurate. Because of this, the calibration requirements for them are usually stricter. In farenheit the range is 71.6-75.2 degrees so it seems like any modern facility should be able to come close to this requirement. Please let me know if you have any other questions.

Have a great day,

Brian P.

Applications Engineer
National Instruments