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III- 17 Programming Manual Part III Inspection Algorithm 1.7.3 Setting Procedur e Step1: Select a lighting that displays the brightness level difference between the component and the PCB visually clear from the Lighting …

III-16

Programming Manual

Part III Inspection Algorithm

1.7 Peak

1.7.1 Inspection Overview

Peak is the algorithm to inspect based on peak value within an inspection window.

If the peak of brightness level is in OK range, the result will be OK.

Brightness level within an inspection window can be obtained stably because this algorithm is not

affected by noise. Peak is suitable for a missing inspection of IC components.

1.7.2 Parameter Setting

Figure 1-17 Peak

Parameter Description

Lighting

Select a lighting that displays the brightness level difference between the

component and the PCB visually clear.

Algorithm Select Peak.

Step[0-255]

Default is 8. The bar graph shows the number of pixels that is divided brightness

level by 8 in the graph in the lower right side of the dialog.

Option Enter 0.

Shift[V1-V8]

Enter the appropriate vector. Any value from V1 to V8 is available.

Select the vector according to the Memorize to ﬁ eld of the Adjust window.

Memorize to -

Upper, Lower

Calculates a value intermediate between OK sample and NG sample value. If OK

sample value is smaller than NG sample value, enter intermediate value in Upper

ﬁ eld and 0 in Lower ﬁ eld. If NG sample value is smaller than OK sample value,

enter 255 in Upper ﬁ eld and intermediate value in Lower ﬁ eld.

Sample Shows the peak value within the inspection window.

The graph in the lower

right side of the dialog

The Histogram of Luminance bar graph shows the number of pixels of every

bright level. Sample value is the largest brightness which is distributed within

the inspection window.

Table 1-7 Parameter of Peak

III-17

Programming Manual

Part III Inspection Algorithm

1.7.3 Setting Procedure

Step1: Select a lighting that displays the brightness level difference between the component and

the PCB visually clear from the Lighting drop-down list.

Step2: Make sure of the OK brightness level.

Move the inspection window onto the surface of the

component and make sure of the sample value.

NOTE

Sample value is the peak value within the inspection window.

㪏㪇㪐㪇㪎㪇

㪍㪇㪌㪇㪎㪇

㪎㪇㪍㪇㪎㪇

Sample Value[70]

Figure 1-18 Calculation of Sample Value

Step3: Make sure of the NG brightness level. Move the inspection window to the PCB and make

sure of the sample value.

Step4: Calculate a value intermediate between OK sample value and NG sample value.

CAUTION

Change the lighting if there is no difference between OK sample value and NG

sample value with default lighting.

0 255

㪉㪈㪇㪎㪇

㪈㪋㪇

Intermediate Value

OK Sample Value NG Sample Value

Figure 1-19 Calculation of Intermediate Value

Step5: If OK sample value is smaller than NG sample value, enter intermediate value in Upper

ﬁ eld and 0 in Lower ﬁ eld. If NG sample value is smaller than OK sample value, enter 255

in Upper ﬁ eld and intermediate value in Lower ﬁ eld.

Step6: Enter the appropriate vector into the Shift ﬁ eld by selecting from V1 to V8 according to the

vector used in the Memorize to ﬁ eld in the Adjust window.

Step7: Press Inspect. Make sure that the inspection is completed properly.

III-18

Programming Manual

Part III Inspection Algorithm

1.8 Average

1.8.1 Inspection Overview

Average is the algorithm to average the brightness level of the inspection window.

If the average of brightness level is in the OK range, the result will be OK.

Average is suitable for reverse inspections of chip components or polarity inspections of IC components

(refer to Part III 1.9.5 Use of Average).

1.8.2 Parameter Setting

Figure 1-20 Average

Parameter Description

Lighting

Select a lighting that displays the brightness level difference between the surface and the

back side visually clear.

Algorithm Select Average.

Shift[V1-V8]

Enter the appropriate vector. Any value from V1 to V8 is available.

Select the vector according to the Memorize to ﬁ eld of the Adjust window.

Memorize to -

Upper, Lower

Calculates a value intermediate between OK sample value and NG sample value. If OK sample

value is smaller than NG sample value, enter intermediate value in the Upper ﬁ eld and 0 in

the Lower ﬁ eld. If NG sample value is smaller than OK sample value, enter 255 in the Upper

ﬁ eld and intermediate value in the Lower ﬁ eld.

Sample

Shows the brightness level average of the inspection window.

Table 1-8 Parameter of Average