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I-22
Applications Guide
Model 6485 Picoammeter Instruction Manual
Surface insulation resistance (SIR)
shows how to measure the insulation resistance between PC board traces. Note
that the drawing shows a "Y" test pattern for the measurement. This is a typical test pattern
for SIR tests.
A bias voltage (typically 50V) is applied to the test pattern for a specified time (typically
one second) to polarize the test pattern. The test voltage (typically 100V) is then applied
and, after a specified time (typically one second), Model 6485 measures the current. Sur-
face insulation resistance can now be calculated as follows:
where: V is the sourced test voltage
I is the measured current
Figure I-19
Connections; surface insulation resistance test
Photodiode characterization prior to dicing
The Model 6485 can be used as part of a cost-effective semiconductor photodiode leakage
test system. This test characterizes the photo current under various illumination condi-
tions.
In addition to the Model 6485, specialized equipment is required. This equipment includes
a calibrated optical source in addition to semiconductor equipment (probe card or needle
SIR
V
I
----
=
A
+
-
HI
LO
HI
LO
PC Board
Test Pattern
Programmable
V-Source
(V)
6485
Picoammeter
Measured
Current
(I)
Metal
Shield
Equivalent Circuit
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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