Agilent Technologies 4339B, Руководство по эксплуатации

Страница: 217 / 287

4339B High Capacitance DUT Measurement
High Capacitance DUT Measurement
When the 4339B measures a DUT that has high capacitance , A C noise creates major instability
factors in the measurement because capacitance is sensitive to A C noise . If you want to
measure the resistance of a high-capacitance DUT maintaining more than 10 % of S/N
(Signal/Noise) ratio , the maximum capacitance of the DUT's for each measurement range are
listed in T able 7-1 .
T able 7-1. Maximum Measurable Capacitance
Measurement
Range
Measurement Time
Short Medium Long
100 pA | 1 nF 10 nF
1 nA 1 nF 10 nF 100 nF
10 nA 10 nF 100 nF 1 F
100 nA 100 nF 1 F 10 F
1 A 1 F 10 F 100 F
10 A 10 F 100 F 1 mF
100 A 100 F | |
T o measure a DUT with even higher capacitance , connect a resistor in series with DUT to
reduce the measurement icker . The 16339A Component T est Fixture with its exchangeable
output resistors is an ideal solution for this application. The 16339A has four output resistor
(100 k, 1 M, 10 M, and 100 M). Ideally , a higher series resistance enables more stable
measurement. However , there are limitations to these resistances of each measurement range ,
as listed in T able 7-2 .
T able 7-2. Limit Output Resistance for Each Range
Measurement Range Output Resistor
100 pA 100 M
1 nA 10 M
10 nA 1 M
100 nA 100 k
Measurement Basics 7-5