Ac Voltage Accuracy Equations; 4-Wire Ohms Accuracy Equations - HP E1411A Service Manual

AC Voltage
Accuracy Equations
4-Wire Ohms
Accuracy Equations
Appendix A
From Appendix A- Specifications of the HP E1326A /E1411A or E1326B
/E1411B User's Manual, AC voltage 90-day accuracy = (% of reading +
volts). The accuracy equations for the ranges, frequencies and apertures
used in the performance verification tests are:
Range Frequency
87.5 mV 20 Hz
87.5 mV 60 Hz
87.5 mV 5 kHz
87.5 mV 10 kHz
300 V 5 kHz
Example: Calculate AC Voltage Accuracy
For a 0.07 ACV input to the multimeter, using the 87.5 mV range, 60 Hz
frequency, and 16.7/20 msec aperture, multimeter accuracy (90-days) =
(0.675% reading + 200 V) = (.00675 x 0.07 + 200 x 10
Volts. Thus, for a 0.07 ACV input the High Limit in Table 4-1 = 0.070673
Volts and the Low Limit = 0.069327 Volts.
From Appendix A- Specifications of the HP E1326A /E1411A or E1326B
/E1411B User's Manual, 4-Wire resistance 90-day accuracy = (% of
reading + Ohms). The accuracy equations for the ranges and apertures used
in the performance verification tests are:
Range
2 k
131 k
1 M
Example: Calculate 4-Wire Resistance Accuracy
For a 1 k input to the multimeter, using the 2 k range and 16.7/20 msec
aperture, multimeter accuracy (90-days) = (.025% reading
+ 20 m ) = (.00025 x 1000 + 20 x 10
input the High Limit in Table 4-1 = 1000.27
.
Accuracy [ (% of reading + Volts)]
2.175 + 1 mV
0.675 + 200 V
0.675 + 200 V
3.175 + 200 V
1.125 + 500 mV
Accuracy [ (% of reading + Ohms)]
0.025 + 20 m
0.025 + 1
0.025 + 10
-3
) = 0.270 . Thus, for a 1 k
and the Low Limit = 999.73
Calculating Multimeter Accuracy 67
-6
) = 0.000673