Agilent Technologies Agilent 34980A, Руководство по обслуживанию

Страница: 56 / 164

40 34980A Service Guide
2
Specifications
Understanding the “% of range“ Error
The range error compensates for
inaccuracies that result from the function and range you select. The range error
contributes a constant error, expressed as a percent of range, independent of the input
signal level. The following table shows the range error applied to the DMM’s 24-hour dc
voltage specification.
Total Measurement Error
To compute the total measurement error, add the reading
error and range error. You can then convert the total measurement error to a “percent of
input” error or a “ppm (part-per- million) of input” error as shown below.


Example: Computing Total Measurement Error
Assume that a 5 Vdc signal is input to the DMM on the 10 Vdc range.

To compute the total measurement error using the 90-day accuracy specification of
±(0.0020% of r 0.0005% of range).





Range Input Level Range Error
(% of range) Range Error
voltage
10 Vdc
10 Vdc
10 Vdc 10 Vdc
1 Vdc
0.1 Vdc
0.0004
0.0004
0.0004

40

V

40

V

40

V
% of input error =
Total Measurement Error
Input Signal Level
------------------------------------------------------------- 100

ppm of input error =
Total Measurement Error
Input Signal Level
------------------------------------------------------------- 1 000 000
  
Reading Error 0.0020% x 5 Vdc = 100

V =
Range error = 0.0005% 10 Vdc = 50

V

Total Error = 100

V + 50

V = 150

V

= 0.0030% of 5 Vdc

= 30 ppm of 5 Vdc

深圳德标仪器
135-1095-0799