IPC-TM-650 EN 2022 试验方法1.pdf - 第86页
Figure 3 Micro hm Meter Calib ration Curves IPC-TM-650 Number Subject Date Revision Page 4 of 4
IPC-TC-500
NOTE:
Figure 1 Resistance Calculation of Plated-Through
Connection
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Figure 3 Microhm Meter Calibration Curves
IPC-TM-650
Number
Subject Date
Revision
Page 4 of 4
Table 2A % of Sample by Weight—Nominal Sizes
Less Than 1%
Larger Than
80% Minimum
Between
10% Maximum
Less Than
Type 1 150 Microns 150–75 Microns 20 Microns
Type 2 75 Microns 75–45 Microns 20 Microns
Type 3 45 Microns 45–25 Microns 20 Microns
Table 2B % of Sample by Weight—Nominal Sizes
Less Than 1%
Larger Than
90% Minimum
Between
10% Maximum
Less Than
Type 4 38 Microns 38−20 Microns 20 Microns
Table 3
Type 1 +150µm +75 µm +20 µm –20 µm
Type 2 + 75 µm +45 µm +20 µm –20 µm
Type 3 + 45 µm +25 µm +20 µm –20 µm
Type 4 + 38 µm +20 µm –20 µm
IPC-TM-650
Number
Subject Date
Revision
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