Unitek MICROPULL IV MP4/115 Operation And Maintenance Manual page 46

CHAPTER 3: OPERATING INSTRUCTIONS
9 By pressing <F5>, the operator may graph a histogram of the data resulting from the 16 tests in this
example. It will be similar to that shown below:
HISTOGRAM
NUMBER OF BONDS - Each X = 1 Bonds
PULL
0
gf
10.5
11.0
11.5
12.0
12.5
13.0
13.5
14.0
0
NUMBER OF BONDS - Each X = 1 Bonds
10 The Average Pull Strength, Standard Deviation and related values shown with the histogram may differ
slightly from the results obtained from the actual data as the value assigned to each cell is used for the
histogram calculations and the actual data is used for calculating the summary for each test. Specifically,
if the data taken in step 8 was used, the results would have been:
No. of Tests:
Aver. Pull Strength:
Standard Deviation:
Standard Deviation:
Mean - 3(Std Dev.):
3-18
12-08-1987
5 10 15
0
0
XXX 3
XXXX 4
XXX 3
XXXX 4
X 1
X 1
5 10 15
No. of Bond Tests:
Aver. Pull Strength:
Standard Deviation:
Standard Deviation:
Aver. – 3 (Std Dev.):
HISTOGRAM
12.5 gf
0.7 gf
10.2 gf
®
MICROPULL IV WIRE BOND PULL TESTER
TOTAL 16 Bonds
20 25 30
20 25 30
ACTUAL
16
12.6 gf
5.9%
10.4 gf
35 40 45
35 40 45
16
12.5 gf
0.7 gf
5.9%
10.2 gf
16
0.7 gf
5.8%
50
50
990-180