4
Uncertainty Budget
4027F2M
*
*. All values 2σ
4027F10M
*
4027F60M
*
Frequency
Error...
at cal freq ± 0.1% ± 0.1% ± 0.1%
not at cal freq ± 0.5% ± 1.5% ± 0.5%
Power
Linearity...
at cal power ± 0.1% ± 0.1% ± 0.1%
not at cal power ± 1.0% ± 0.5% ± 1.0%
Temperature
Uncert...
within 20 to 30°C ± 0.65% ± 0.6% ± 0.5%
outside 20 to 30°C ± 3.2% –3.0, +0.75% ± 2.9%
Calibration Uncertainty ± 0.6% ± 0.6% ± 0.6%
Resolution
Uncert...
at cal power ± 0.06% ± 0.06% ± 0.06%
not at cal power
†
†. Resolution uncertainty is error due to limited display digits. Actual
uncertainty can be calculated as:
± (1 in least significant digit) / Reading
For a 3.5-digit display, worst case is at 300W. Least significant digit
is one watt, uncertainty is ± 1W out of 300 or 0.34%. For a 4.5-digit
display, least significant digit is 0.1W, so the uncertainty is 0.034%
± 0.34% ± 0.34% ± 0.34%
Other sources of error ± 0.4% ± 0.5% ± 0.6%
Best Case RSS Uncertainty ± 1.0% ± 1.0% ± 1.0%
