Service manual

input the Low Limit in Table 4-1 = 6.9986 Volts and the High Limit =
7.0014 Volts.
AC Voltage
Accuracy
Equations
From Appendix A of the Agilent E1326B/E1411B User’s Manual, AC
voltage 1-year 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
300 V
60 Hz
5 kHz
10 kHz
5 kHz
0.695 + 200 µV
3.195 + 200 µV
3.195 + 200 µV
10.14 + 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 (1-year)
= ± (0.695% reading + 200 µV) = ± (.00695 x 0.07 + 200 x 10
-6
) =
± 0.0007 Volts. Thus, for a 0.07 ACV input the Low Limit in Table 4-1
= 0.0693 Volts and the High Limit = 0.0707 Volts.
4-Wire Ohms
Accuracy
Equations
From Appendix A of the Agilent 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 kΩ
131 kΩ
1 MΩ
0.04 + 20 mΩ
0.04 + 1 Ω
0.04 + 10 Ω
Example: Calculate 4-Wire Resistance Accuracy
For a 1 kΩ input to the multimeter, using the 2 kΩ range and 16.7/20
msec aperture, multimeter accuracy (1-year) = ± (.04% reading + 20
mΩ) = ± (.0004 x 1000 + 20 x 10
-3
) = ± 0.4 Ω. Thus, for a 1 kΩ input
the Low Limit in Table 4-1 = 999.6 Ω and the High Limit = 1000.4 Ω.
Calculating Multimeter Accuracy A-3