Service manual

Test Accuracy
Ratio (TAR)
Calculations
For the E1411 multimeter, Test Accuracy Ratio (TAR) = [High Limit -
Input Value]/Measurement Uncertainty where the source input value is in
DCV, ACV, or Ohms.
Example: Calculate DCV Test Accuracy Ratio
For a 7.0 DCV measurement if the High Limit value = 7.000750 DCV and
the Measurement Uncertainty = .0000115 DCV, Test Accuracy Ratio
(TAR) = (7.000750 V - 7.0000000 V)/.0000115 V = 65:1 (rounded to the
nearest integer value). Since this value is >10:1, the entry in Table 4-1 is
">10:1".
68 Calculating Multimeter Accuracy Agilent E1411A/E1411B Service Manual