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# As discussed in the previous meeting, we upload 13 gaps in the database. - PowerPoint PPT Presentation

Discussion for QC steps Leak & Pop Spacers. As discussed in the previous meeting, we upload 13 gaps in the database. 30 gaps with  RE4/2 types with Batch 12 HPLs. D estroyed ~ 20 gaps to investigate the inside oil condition. P roblem !

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Leak & Pop Spacers

As discussed in the previous meeting, we upload 13 gaps in the database.

30 gaps with RE4/2 types with Batch 12 HPLs.

Destroyed ~ 20 gaps to investigate the inside oil condition.

Problem !

In the test step for leak & pop spacers test, the current rejection limits seem to be too tight. We have to take into account pressure & temperature variation of the test laboratory. The pressure measured by the sensor is the gauge pressure p – p0, NOT absolute pressure.

1. Variation of p0 outside

2. Variation of T of air inside the gap

∆T = 0.1o during the 10 minutes causes a pressure variation ~ 0.33 hPa.

0.2 hPa would be an uncontrollable amount.

The proper rejection limits seem to be

RE4/2 TW: 0.3 hPa, RE4/2 TN: 0.3 hPa, RE4/2 B: 0.4 hPa

RE4/3 TW: 0.3 hPa, RE4/3 TN: 0.4 hPa, RE4/3 B: 0.5 hPa

KODEL-TEST-RE4-2-B004

KODEL-TEST-RE4-2-B005

KODEL-TEST-RE4-2-B006

KODEL-TEST-RE4-2-B007

KODEL-TEST-RE4-2-B008

KODEL-TEST-RE4-2-B009

KODEL-TEST-RE4-2-B010

KODEL-TEST-RE4-2-TW006

RE4/2 Top wide

(small gaps)

KODEL-TEST-RE4-2-TN004

KODEL-TEST-RE4-2-TN005

RE4/2 Top narrow

(mid-sized gaps)

KODEL-TEST-RE4-2-TN006

KODEL-TEST-RE4-2-TN008