Test Accuracy Ratio (T A R) Calculations - HP E1328A Service Manual

Test Accuracy
Ratio (T A R)
Calculations
58 Calculating D/A Converter Accuracy
Accuracy (10 mA range) = [20.0 ppm of Reading + 5.0 ppm of Range]
Temp Coeff = [2.0 ppm of Reading + 1.0 ppm of Range]
Absolute Accuracy Factor = [5.0 ppm of Reading]
Meas Uncertainty (A) =
Reading and Range in Amps DC
For the 100 mA range:
Accuracy (100 mA range) = [35.0 ppm of Reading + 5.0 ppm Range]
Temp Coeff = [2.0 ppm of Reading + 1.0 ppm of Range]
Absolute Accuracy Factor =
Meas Uncertainty (A) =
Reading and Range in Amps DC
Example: Calculate DCI Measurement Uncertainty
For a 4.0 mA dc reading on the 10 mA range for the conditions specified in
this manual:
Measurement Uncertainty (Amps) = [10
-6
Range)] = [10 x (27.0 x .004 + 6.0 x .010)] = 0.168 x 10
0.168 A.
For a 16.0 mA dc reading on the 100 mA range for the conditions specified
in this manual:
Measurement Uncertainty (Amps) = [10
-6
Range)] = [10 x (42.0 x .016 + 6.0 x .100)] = 1.272 x 10
1.272 A.
For the HP E1328A D/A Converter:
Test Accuracy Ratio (TAR) =
Example: Calculate Voltage Output Test Accuracy Ratio
[27.0 ppm of Reading + 6.0 pp of Range]
[5.0 ppm of Reading]
[42.0 ppm of Reading + 6.0 ppm of Range]
-6
x (27.0 x Reading + 6.0 x
-6
x (42.0 x Reading + 6.0 x
High Limit
Measurement Uncertainty
-6
A =
-6
A=
Output
Appendix A