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Model 6485 Picoammeter Instruction Manual
Applications Guide
I-13
Figure I-10
Range change voltage transients
NOTE
The current that can be inadvertently delivered to the DUT is limited by an
internal resistance. This internal resistance varies as the range is changed. For
example, manually up-ranging from 2
µ
A
to the 20
µ
A
range can never deliver
more than 10V/50k
Ω
= 200
µ
A
to the DUT. This current will be further limited
by any impedance of the DUT.
Up-range input response
illustrates the type of transient voltage that can be expected when up-ranging
with a full-scale input signal (200
µ
A signal on 200
µ
A range, up-range to 2mA range).
Both the magnitude and duration of this voltage are reduced for lower current ranges. The
current limit imposed by the R
F
is also greatly reduced. The polarity depends on the polar-
ity of the input current.
was measured with a positive input current.
6485 Picoammeter
RF
HI
LO
VTransient
Range being
RF
changed to:
2mA, 20mA
500
W
20
m
A, 200
m
A
50k
W
200nA, 2
m
A
5M
W
2nA, 20nA
500M
W
Содержание 6485
Страница 1: ...Model 6485Picoammeter Instruction Manual A G R E A T E R M E A S U R E O F C O N F I D E N C E ...
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Страница 44: ...1 20 Getting Started Model 6485 Picoammeter Instruction Manual ...
Страница 66: ...3 6 Measurements Model 6485 Picoammeter Instruction Manual ...
Страница 138: ...9 20 Remote Operation Model 6485 Picoammeter Instruction Manual ...
Страница 159: ...11 CommonCommands ...
Страница 164: ...11 6 Common Commands Model 6485 Picoammeter Instruction Manual ...
Страница 165: ...12 SCPISignalOriented MeasurementCommands ...
Страница 190: ...14 12 SCPI Reference Tables Model 6485 Picoammeter Instruction Manual ...
Страница 214: ...16 14 Calibration Model 6485 Instruction Manual ...
Страница 219: ...A Specifications ...
Страница 221: ...B StatusandErrorMessages ...
Страница 227: ...C GeneralMeasurement Considerations ...
Страница 233: ...D DDCEmulationCommands ...
Страница 247: ...E ExamplePrograms ...
Страница 250: ...E 4 Example Programs Model 6485 Picoammeter Instruction Manual ...
Страница 251: ...F IEEE 488BusOverview ...
Страница 266: ...F 16 IEEE 488 Bus Overview Model 6485 Picoammeter Instruction Manual ...
Страница 267: ...G IEEE 488andSCPI ConformanceInformation ...
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