IPC-TM-650 EN 2022 试验方法1.pdf - 第555页

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IPC-TM-650
Number Subject Date
Revision
4.5 Micrometer
A micrometer with a minimal resolution of 0.001mm [0.00004 inch] or better.
4.6 Circulating Oven
An air circulating oven with capable of a temperature of 105 ± 1 °C [221 ± 1.8 °F].
4.7 Test Chamber
A test chamber for variable temperature testing capable of a range of -125 °C to +110 °C [-193 to +230 °F]. Other
temperature ranges may be used as agreed between user and supplier. Temperature accuracy must be ± 1 °C ( ± 1.8 °F) of actual set
point.
5 Procedure
5.1 Preconditioning
All specimens shall be conditioned at 23 ± 2 °C [73.4 ± 3.6 °C] and 50 ± 5 % RH for a minimum of 24 hour after
etching and prior to testing.
5.2 Testing of relative permittivity and loss tangent at room temperature
5.2.1
The ambient test temperature should be 23 °C ± 2 °C [73.4 ± 3.6 °F]. The variation should not exceed ± 1 °C [± 1.8 °F] during
the test. Allow a minimum of 30 minutes for the VNA to warm up and stabilize.
5.2.2
Select a SPDR test fixture in accordance with the test frequency. The specimen size and thickness shall comply with the
requirements specified in Table 1. For example, if the test frequency is 10 GHz, a SPDR test fixture with 10 GHz nominal frequency
should be selected. The supported specimen size is 80 mm × 80 mm [3.2 X 3.2 inch] and the maximum thickness of specimens is no
more than 0.9 mm [0.035 inch].
5.2.3
Connect the SPDR test fixture to VNA. The test fixture shall be kept horizontal. Set the VNA parameters according to the
manufacturer’s instructions and the nominal frequency of the SPDR fixture.
5.2.4
Measure resonance frequency (f
0
) and Q-factor (Q
0
) values of the empty resonator.
5.2.5
Utilize a micrometer to measure the thickness of the specimen and record as h. Insert the specimen into the test fixture. The side
with marking is face up and the edge of this side has to be aligned with the fixture edge.
5.2.6
Measure the resonance frequency (f
s
) and Q-factor (Q
s
) of the resonator containing the specimen. A plot of the change of
resonance frequency with or without the specimen is shown in Figure 3.
Figure3–PlotShowingChangeofResonanceFrequency
2.5.5.15
RelativePermittivityandLossTangentUsinga
06/22
Split-PostDielectricResonator
N/A
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