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Amps Measurements
4-15
Surface insulation resistance (SIR)
NOTE
For this test, Model 6514 uses the source voltage, measure current method to
determine resistance. Once a current measurement is performed, resistance can be
calculated.
Figure 4-9 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 6514 measures the current. Surface insulation
resistance can now be calculated as follows:
SIR = V/I
where;
V is the sourced test voltage
I is the measured current
230
V-Source
A
+
-
6514
Picommeter
HI
LO
HI
LO
PC Board
Test Pattern
Equivalent Circuit
Figure 4-9
Connections; surface
insulation resistance
test
Summary of Contents for 6514
Page 203: ...14 CommonCommands...
Page 207: ...15 SCPISignalOriented MeasurementCommands...
Page 235: ...18 PerformanceVerification...
Page 254: ...19 Calibration...
Page 274: ...20 RoutineMaintenance...
Page 278: ...A Specifications...
Page 282: ...B StatusandErrorMessages...
Page 288: ...C GeneralMeasurement Considerations...
Page 294: ...D DDCEmulationCommands...
Page 299: ...E ExamplePrograms...
Page 306: ...F IEEE 488BusOverview...
Page 320: ...G IEEE 488andSCPI ConformanceInformation...
Page 324: ...H CalibrationOptions...