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Basic Source-Measure Operation
Current measurements and capacitive loads
When measuring current in a test circuit that has high capacitance, ringing may occur. Ring-
ing is the fluctuation of current readings that is initiated by a voltage step. This fluctuation
eventually decays to a settled current reading. The higher the capacitance, the more ringing that
will occur.
Table 3-5 lists the maximum capacitive loads that the Model 6430 can accommodate effec-
tively. For the higher current ranges (1nA range and higher), the listed values represent the larg-
est capacitance in which ringing created by a voltage step will decay in less than one power line
cycle. For the lower current ranges (100pA and lower), the listed values represent the largest
capacitance that causes ringing that will settle in a reasonable amount of time.
Current measurements can be performed for higher capacitive loads as long as the increased
ringing can be tolerated. Ringing can be reduced by adding a resistor in a series with the load at
the expense of longer settling times. See
Source capacitance
in Appendix F for more
information
.
T
a
b
le 3
-5
Maximum capacitive loads
Current range
Maximum
Capacitive Load
100mA
0.2µF
10mA
0.2µF
1mA
0.2µF
100µA
0.04µF
10µA
3300pF
1µA
470pF
100nA
100pF
10nA
100pF
1nA
100pF
100pA
100pF
10pA
100pF
1pA
100pF
Содержание 6430
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Страница 78: ...2 14 Connections ...
Страница 98: ...3 20 Basic Source Measure Operation ...
Страница 138: ...5 30 Source Measure Concepts ...
Страница 156: ...6 18 Range Digits Speed and Filters ...
Страница 168: ...7 12 Relative and Math ...
Страница 176: ...8 8 Data Store ...
Страница 202: ...9 26 Sweep Operation ...
Страница 248: ...11 22 Limit Testing ...
Страница 310: ...16 6 SCPI Signal Oriented Measurement Commands ...
Страница 418: ...17 108 SCPI Command Reference ...
Страница 450: ...18 32 Performance Verification ...
Страница 477: ...A Specifications ...
Страница 489: ...B StatusandErrorMessages ...
Страница 498: ...B 10 Status and Error Messages ...
Страница 499: ...C DataFlow ...
Страница 503: ...D IEEE 488BusOverview ...
Страница 518: ...D 16 IEEE 488 Bus Overview ...
Страница 519: ...E IEEE 488andSCPI ConformanceInformation ...
Страница 523: ...F MeasurementConsiderations ...
Страница 539: ...G GPIB488 1Protocol ...
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