6247G/6247C DC Voltage Current Source/Monitor Operation Manual
9.5 Supplementary Descriptions
9-13
9.5
Supplementary Descriptions
9.5.1
How to Calculate Accuracy for Current Source, Current Measurement and
Current Limiter
Example) Calculating the accuracy in current source of 2.7 mA (3 mA range)
The accuracy formula in the current source range of 3mA is as follows:
The accuracies in current source and current measurement are always calculated by using the output volt-
age of 1 V.
Assume that the output voltage is 1V.
Accuracy =
(% of s A + A
Vo / 1V)
= ±(2.7 mA
0.03% + 1.5
A + 30 nA
1 V / 1 V)
=
± 2.34
A
Thus, the accuracy in current source of 2.7 mA (3 mA range) is specified between 2.6977 mA to 2.7023
mA.
On the other hand, assume that the output voltage is 15 V.
Accuracy =
(2.7 mA
0.03% + 1.5
A + 30 nA
15 V / 1 V)
=
± 2.76
A
Thus, the accuracy is specified between 2.6972 mA to 2.7028 mA
NOTE:
Vo in the 1-day stability, current limiter and temperature coefficient for voltage source all indicates
source voltage.
Range
Accuracy
(% of s A + A
Vo / 1V)
Current source
3 mA
0.03 + 1.5
A + 30 nA