Service manual

AC Voltage
Accuracy
Equations
From Appendix A- Specifications of the 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
Accuracy [
±(% of reading + Volts)]
87.5 mV
87.5 mV
87.5 mV
87.5 mV
300 V
20 Hz
60 Hz
5 kHz
10 kHz
5 kHz
2.175 + 1 mV
0.675 + 200
µV
0.675 + 200
µV
3.175 + 200
µV
1.125 + 500 mV
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 µV) = ±(.00675 x 0.07 + 200 x 10
-6
) = ±0.000673
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.
4-Wire Ohms
Accuracy
Equations
From Appendix A- Specifications of the 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
Accuracy [
±(% of reading + Ohms)]
2 k
Ω
131 kΩ
1 MΩ
0.025 + 20 m
Ω
0.025 + 1 Ω
0.025 + 10 Ω
Example: Calculate 4-Wire Resistance Accuracy
For a 1 k
Ω input to the multimeter, using the 2 kΩ range and 16.7/20 msec
aperture, multimeter accuracy (90-days) =
±(.025% reading
+ 20 m
Ω) = ±(.00025 x 1000 + 20 x 10
-3
) = ±0.270 Ω. Thus, for a 1 kΩ
input the High Limit in Table 4-1 = 1000.27 Ω and the Low Limit = 999.73
Ω.
Agilent E1411A/E1411B Service Manual Calculating Multimeter Accuracy 65