Figure 4-9 Connections; Surface Insulation Resistance Test; Surface Insulation Resistance (Sir) - Keithley 6514 Instruction Manual

Surface insulation resistance (SIR)

NOTE
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;
Figure 4-9
Connections; surface
insulation resistance
test
V-Source
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.
V is the sourced test voltage
I is the measured current
PC Board
Test Pattern
+ HI
230
-
LO
Equivalent Circuit
Amps Measurements
HI
6514
A
Picommeter
LO
4-15