A-12
Specifications
Accuracy calculations
The information below discusses how to calculate accuracy for both DC and AC
characteristics.
Calculating DC characteristics accuracy
DC characteristics accuracy is calculated as follows:
Accuracy = ±(ppm of r ppm of range)
(ppm = parts per million, and 10ppm = 0.001%)
As an example of how to calculate the actual reading limits, assume that you are measuring
5V on the 10V range. You can compute the reading limit range from one-year DCV accuracy
specifications as follows:
Accuracy =
±(30ppm of r 5ppm of range)
±[(30ppm
×
5V) + (5ppm
×
10V)]
±(150µV + 50
µ
V)
±200µV
Thus, the actual reading range is: 5V± 200µV, or from 4.9998V to 5.0002V.
DC current and resistance calculations are performed in exactly the same manner using the
pertinent specifications, ranges, and input signal values.
Calculating AC characteristics accuracy
AC characteristics accuracy is calculated similarly, except that AC specifications are given
as follows:
Accuracy =
±(% of r % of range)
As an example of how to calculate the actual reading limits, assume that you are measuring
120V, 60Hz on the 750V range. You can compute the reading limit range from ACV one-year
accuracy specifications as follows:
Accuracy =
±(0.06% of r 0.03% of range)
±[(0.0006
×
120V) + (0.0003
×
750V)]
±(0.072V + 0.225V)
±0.297V
In this case, the actual reading range is: 120V± 0.297V, or from 119.703V to 120.297V.
AC current calculations are performed in exactly the same manner using the pertinent speci-
fications, ranges, and input signal values.
Summary of Contents for 2700
Page 1: ...Contains Servicing Information Model 2700 Multimeter DataAcquisition System Service Manual...
Page 16: ......
Page 17: ...1 PerformanceVeri cation...
Page 48: ...1 32 Performance Verification...
Page 49: ...2 Calibration...
Page 72: ...2 24 Calibration...
Page 73: ...3 RoutineMaintenance...
Page 81: ...4 Troubleshooting...
Page 99: ...5 Disassembly...
Page 106: ...5 8 Disassembly...
Page 107: ...6 ReplaceableParts...
Page 121: ...A Speci cations...
Page 136: ...A 16 Specifications...
Page 137: ...B CalibrationReference...
Page 161: ...C CalibrationProgram Appendix C Page 1 Friday February 18 2000 7 45 AM...
Page 172: ...Service fm Page 2 Friday February 18 2000 7 44 AM...
Page 173: ......
Page 174: ...Keithley Instruments Inc 28775 Aurora Road Cleveland Ohio 44139 Printed in the U S A...