Technical data

Agilent 41000 Administration Guide, Edition 3 5- 13
Measurement Techniques
Low Current Measurements
Offset Current Subtraction
Offset current of the measurement path is considerable for the low current measurement. It
is important to subtract the offset current (Iaverage) from the measurement data (Imeasure)
to approximate the real data (Iresult). This section introduces the following two ways.
• “To subtract the open state offset current”
• “To subtract the contact state offset current”
The offset current can be subtracted as shown in Figure 5-8.
Figure 5-8 Offset Current Subtraction
Offset current (Iaverage)
I
t
e.g. Iaverage = 5.9 fA
Standard deviation = 1.2 fA
5.9 fA
Iresult = Imeasure Iaverage
I
V
<1.2 fA