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User Manual S-23 HM 6 Vision functions Software Vers ion SR.405.xx 05/99 Issue 6.7 Guidelines for Describing Package Form s 301 Measur e the comp onent. M easurement is suc cessful . – R eset the settin gs to the s ugges…

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6 Vision functions User Manual S-23 HM
6.7 Guidelines for Describing Package Forms Software Version SR.405.xx 05/99 Issue
300
6.7.6.5 Testing Illumination Settings
You can set the illumination parameters by calling the ’Illumination’ option (see Section 6.6.4.8 on
page 261). Using the ’Measure Component Option’ on page 247 you can then measure the com-
ponent and check your settings with the aid of the measurement results. 6
Proceed as follows to test your illumination setting: 6
È Using the illumination values suggested in Figures 6.7 - 7 or 6.7 - 8 carry out measurement.
Measurement should run through successfully.
È For each level reduce the set brightness level by 50 %.
Measurement should run through successfully.
È For each level raise the set brightness level by 50 %.
Measurement should run through successfully.
If you are not successful with the above procedure, proceed as follows: 6
È Starting with the suggested illumination value, increase the brightness of each individual illu-
mination level for as long as measurement is still successful.
È Find this upper limit value for each individual illumination level in turn.
È Starting with the suggested illumination value, decrease the brightness of each individual illu-
mination level for as long as measurement is still successful. Find this lower limit value for each
individual illumination level in turn.
È Determine the average value of the upper and lower limit values. This will be the optimum illu-
mination value.
Example of an illumination test: 6
– Settings from the diagram:
flat: 170
middle: 60
steep: 120
– Measure the component. Measurement is successful.
– Reduce setting values by 50%.
flat: 85
middle: 30
steep: 60
– Increase setting values by 50%.
flat: 255
middle: 90
steep: 180
User Manual S-23 HM 6 Vision functions
Software Version SR.405.xx 05/99 Issue 6.7 Guidelines for Describing Package Forms
301
Measure the component. Measurement is successful.
– Reset the settings to the suggested values:
flat: 170
middle: 60
steep: 120
¬ optimum setting
NOTE 6
With respect to 0402 and 0603 components, avoid the nozzle being displayed during imaging. If
this seems likely, remove the component from the nozzle and use the ’Illumination Option’ (see
page 261 to see whether the nozzle did appear in the image. 6
6.7.6.6 General Information on Setting Illumination Values
– As a rule it is better to overilluminate the component than to underilluminate it. A saturated im-
age is preferable to a low-contrast image.
– Optimum illumination is attained when only the leads are imaged and the component body is
not shown.
– If you cannot clearly separate the image of the component body from the leads, we recom-
mend to illuminate body and leads equally and then to measure the outline.
6 Vision functions User Manual S-23 HM
6.8 Recommendation for visually centering components Software Version SR.405.xx 05/99 Issue
302
6.8 Recommendation for visually centering compo-
nents
6.8.1 Visually centering flip-chips
6.8.1.1 Entering the data on the line computer
È Describe the ball radius.
È Select tolerances of between 10 % and 20 %.
6.8.1.2 Setting the parameters on the station computer
È Under the’ Illumination Option’ in the ’Test Component Menu’, select the flat illumination plane
and set the brightness values to between 200 and 255. Do
NOT
use transformation tables to
do this.
È Select a positive ball contrast under the Ball Image Option (see page 265).
PLEASE NOTE 6
If a lot of ’non-ball structures’ are identified as ball structures (they can be recognized by the
small crosses), increase the ball contrast. The number of crosses can be estimated in the
’Measure’ menu during the grid measurement. 6
6.8.1.3 Recommended sequence of measurements for flip-chips
Recommended sequence of measurements for visually centering flip-chips 6
Size measuring mode Grid measuring mode Ball measuring mode
Resolution for calculating
the angle:
low resolution
For single measure-
ment:
3 balls per corner
Standard
ball detection:
Hex value P1 = 80
Fast
ball detection:
Hex value P1 = A0
PLEASE NOTE:
Switch Ball mode off if it is not necessary
to measure all the balls.
In this case, P1 must be set to 80 in Grid mode.
Resolution in the measur-
ing direction:
medium
For multiple measure-
ment:
5 balls per corner
Resolution
in the integration direction:
medium
Hex value P1 = 80
Tab. 6.8.1