Model 6485 Picoammeter Instruction Manual
Applications Guide
I-15
Figure I-12
Down-range voltage transients
Steps to minimize impact of range change transients
When changing between the following range pairs (up or down), no input transients occur:
2nA and 20nA; 200nA and 2
µ
A; 20
µ
A and 200
µ
A; 2mA and 20mA. This is not true when
auto-ranging upwards across these boundaries.
Run test with a fixed range.
If possible, run the test within a fixed range. Choose the higher range from any of the
range pairs listed above. Alternatively, the autorange upper limit
(:RANGe:AUTO:ULIMit, see
“Voltages greater than 220V,” page 2-6
or
can be set so that the internal limiting resistor (R
F
) cannot be reduced to the
lower values. Choose the appropriate range to accommodate the maximum current
expected during normal measurements.
Down-range by starting at highest current necessary
Make use of down-ranging by starting at the highest current necessary and reducing down
to zero, the range change transients can be reduced significantly compared to up-ranging
transients.
Содержание 6485
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Страница 44: ...1 20 Getting Started Model 6485 Picoammeter Instruction Manual ...
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Страница 219: ...A Specifications ...
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Страница 227: ...C GeneralMeasurement Considerations ...
Страница 233: ...D DDCEmulationCommands ...
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Страница 250: ...E 4 Example Programs Model 6485 Picoammeter Instruction Manual ...
Страница 251: ...F IEEE 488BusOverview ...
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Страница 267: ...G IEEE 488andSCPI ConformanceInformation ...
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