Hp 3458A Measurement Uncertainty Calculations; Calculate Dcv Measurement Uncertainty; Calculate Dci Measurement Uncertainty - HP E1328A Service Manual

HP 3458A
Measurement
Uncertainty
Calculations
Calculate DCV
Measurement
Uncertainty
Calculate DCI
Measurement
Uncertainty
Appendix A
Limit value in Table 4-2 = 10.26165 mA and the Lower Limit value =
9.73835 mA.
Measurement uncertainties for the HP 3458A multimeter are calculated
using the 1-year accuracy specifications in Appendix A - Specifications of
the HP 3458A Multimeter Operating, Programming, and Configuration
Manual
The assumed test conditions are:
Test within 24 hours of last HP 3458A ACAL
1 year since last HP 3458A calibration
At least a 1-hour warmup for HP 3458A
(For DCV) 10V fixed range, PRESET, and NPLC 100
(For DCI ) 10 mA or 100 mA fixed range, PRESET, and NPLC
100
For HP 3458A 1 Year specifications, Measurement Uncertainty (DC
Voltage) = Accuracy (1 year) + Temperature Coefficient + Additional
reading error for Absolute Accuracy.
Accuracy = [8.0 ppm of Reading + 0.2 ppm of Range]
Temp Coeff = [0.15 ppm of Reading + 0.01 ppm of Range]
Absolute Accuracy Factor = [2.0 ppm of Reading]
Meas Uncert (V) = [10.15 ppm of Reading + 0.21 ppm of Range]
Reading and Range in Volts DC
Example: Calculate DCV Measurement Uncertainty
For a 5.0 V dc reading on the 10V range for the conditions specified in this
manual:
Measurement Uncertainty (V) =
-6
x Range) = [10 x (10.15 x 5.0 + 0.21 x 10.0)] = 52.85 x 10
52.85 V.
For HP 3458A 1 Year specifications, Measurement Uncertainty (DC
Current) = Accuracy (1 year) + Temperature Coefficient + Additional
reading error for Absolute Accuracy.
For the 10 mA range:
-6
(10.15 x 10 x Reading + 0.21 x 10
Calculating D/A Converter Accuracy 57
-6
-6
V =