Reject And Audio Setpoints - Agilent Technologies VS Series Operation Manual

VS Series Helium Mass Spectrometer Leak Detectors
2.2.4.2 Reject and Audio Set Points
Reject and Audio Set Points make the acceptance and rejection of parts more obvious. By
creating a set point, you let the system indicate if the part meets specification or not. For
example, you select LEAK RATE #1, set the value to 1.0E-8, set the reject activation to
greater than > (activate when the leak rate is above that set point), and turn the set point
ON. Then when the system is put into TEST, it indicates on the front panel that the part has
not meet the set point requirement, until it gets below the set point value and then the set
point failure indication disappears.
Multiple set points are used when you want to indicate several levels of acceptance. There
are times when you may want to assure the leak detector is working properly by bounding
the failure limit. For example, if LEAK RATE #1 were set as per above, then any leak rate
below 1.0E-8 would pass the part. Also assume that the leak detector was not seeing
helium, it would always pass parts. One way of preventing this from happening is to
periodically read the internal calibrated leak. Another way is to place a 5.0E-10 range leak
into the test port along with the part and program a second reject set point to fail if the leak
detector were to go below that value. In that case, you would program LEAK RATE #2 to
4.7E-10, set the reject activation to less than < (activate when the leak rate is below that set
point), and turn the set point ON. In this case, when the system is put into TEST, the system
indicates a failure if the leak rate goes below 5.0E-10.
Press Reject & Audio Set Points on the Menus screen.
❑
The Reject and Audio Set Points screen appears (Figure 2-10).
Use this screen to:
❑
❑
Press the desired
value to access
its keypad
Set the parameters to enable or disable.
Display or change the value of the four reject set points and the audio set point.
0 1 2 3 4
REJECT AND AUDIO SET POINTS
LEAK RATE #1
LEAK RATE #2
LEAK RATE #3
PRESSURE #4
AUDIO SET POINT
Figure 2-10 Reject and Audio Setpoints
5 6 7 8 9
1.0E-08
✕
2.0E-08
✕
3.0E-08
✕
5.0E+00
✕
5.0E-08
✕
10
Toggles these
options on/off.
<
Activates the reject
set point if below
<
the programmed
value
<
Activates the reject
set point if above
the programmed
value
<
DONE
DONE
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