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2 MediTEST User Guide Page 9
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9.2 MODIFYING TEST METHOD PARAMETERS
9.2.1 TARGET VACUUM
The TARGET VACUUM is the optimal vacuum level that will cause all representative packs to
generate a usable and comparable range of reactive forces. The harder the vacuum, the longer the
test cycle time, but the lesser are the adiabatic effects on the vacuum stability. The vacuum level must
be such that is does not cause deformation. This will involve evaluating (empirically) a specified
number of different packs of each format.
To adequately determine the Target Vacuum level packs are evaluated over a range (bracketed)
vacuum levels. This process will have to be repeated for each pack format that is required to be tested
with this method. The table below indicate the range of usable forces that may be generated by a given
surface area for a range of vacuum levels.
TEST METHODS
Vacuum (mbar)
200
400
500
550
600
650
700
Area (cm2)
1
200
400
500
550
600
650
700
2
400
800
1000
1100
1200
1300
1400
4
800
1600
2000
2200
2400
2600
2800
6
1200
2400
3000
3300
3600
3900
4200
8
1600
3200
4000
4400
4800
5200
5600
12
2400
4800
6000
6600
7200
7800
8400
16
3200
6400
8000
8800
9600
10400
11200
30
6000
12000
15000
16500
18000
19500
21000
60
12000
24000
30000
33000
36000
39000
42000
100
20000
40000
50000
55000
60000
65000
70000
160
32000
64000
80000
88000
96000
10400
0
11200
0
Figure 9.1