Agilent Technologies 4349B Manual page 157

4349B
How to Reduce the Measurement Error
The measurement error due to the DC voltage source's noise can be reduced by connecting a
resistor in series with the DUT(capacitor).
Figure 6-6 shows the DC resistance and capacitance value that can be measured within 10%
additional error when connecting a series resistor (1 k , 5 k , 10 k , 50 k , and 100 k ). The
external DC voltage source used in this example is the same as that of Figure 6-5.
For example, in the case of measuring a 10  F capacitor's resistance, the maximum resistance
that can be measured within 10% error is
- about 200 M without a series resistor,
- about 1.8 G with a 100 k series resistor.
As shown in Figure 6-6, the additional error due to the DC voltage source's noise
can be reduced by connecting a series resistor, plus you can expand the measurable
resistance/capacitance range. However, it must be noted that the required charging time for
the DUT becomes longer if you connect a series resistor.
Figure 6-6. 10% Additional Error
Application Measurement 6-11