302R29N1R0CF4E Datasheet, PDF (6/7 Pages) Johanson Technology Inc. – High Voltage PolyTerm® Ceramic Capacitors

www.johansondielectrics.com
Bend Test Description
The test board is designed so that the capacitance of the part can be measured while the part is being flexed
(See figure 1). The capacitor is mounted at the center of the board. The testing equipment has a pressing block
that is located so that it applies force at the center of the test board from below the part at a constant rate. Since
the edges of the board are held in place by the support pins, this causes the board to flex. The amount of flex is
measured in millimeters from the center of the board to the edge, please see “A” in Figure 2.
“A”
+
+
Figure 1
R2.5
Units: mm
Figure 2
20
Pressing Block
Probes
40
45±2
45±2
A
Support Pins
As the test board is flexed, the capacitance is constantly being measured by a capacitance meter which is con-
nected to the test boards through capacitance probes. The capacitance is first measured at 0mm flex to establish
the nominal value. The test board is then flexed to 1mm and held for at least on second, then the capacitance
is measured, it is then flexed to 2mm, and so on up to 5mm. Any change in capacitance that exceeds 5% of the
nominal value is considered a failure.
100%
90%
80%
70%
60%
50%
40%
30%
20%
10%
0%
3 mm
Bend Test Results 1808 size
PolyTerm
Standard Product
4 mm
5 mm 6 mm
Board Flex (mm)
8 mm 10 mm

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