Additional Error Due To Voltage Source Noise - Agilent Technologies 4349B Manual

Additional Error Due to Voltage Source Noise

The error caused by the DC voltage source's noise appears as a measurement value uctuation.
Figure 6-5 shows an estimation of the additional error caused by the DC voltage source's noise
under the following conditions:
External DC voltage output : 100 V
4349B Measurement Speed : 30 ms
DC voltage source performance :
Ripple
Wide band nosie
Switching noise
Note
The DC voltage source's output resistance is assumed to be 0 in this example.
Figure 6-5. Additional Error Due to Voltage Source Noise
For example, when measuring a capacitor of 2 G resistance and 1  F capacitance, the leakage
current (50 nA=100 V/2 G ) can be measured within 10% additional error. That is, the
measurement value will uctuate from 45 nA to 55 nA (or 1.82 G to 2.22 G ).
Figure 6-5 shows the measurement error due to the external DC voltage source only. To
estimate the total system measurement error, it is also necessary to include the 4349B's
measurement accuracy in addition to the error shown in Figure 6-5.
6-10 Application Measurement
5  Vrms(@50 Hz)
p
1  Vrms/ Hz (@50 Hz)
< 10 mVrms(@100 Hz)
4349B