VS Series Helium Mass Spectrometer Leak Detectors
2-26
DRAFT 4/
23/15
Range Stop Configures the leak detector so that it only auto-ranges down to
the pre-selected decade entered in the Range Stop variable field.
For example,
if range stop was enabled and the range stop setting
was 10
07
, the most sensitive range that the leak detector would
displays is full scale 10
7
atm cc/sec. To allow auto-ranging to the
maximum sensitivity of the system, turn Range Stop Off.
This feature is useful when a product specification is more
than one decade less stringent than the actual sensitivity of the
leak detector. If the leak detector is capable of
displaying full
scale < 10
11
atm cc/sec, but the test specification is only in
the 10
7
atm cc/sec range, then setting the range stop to
10
08
atm cc/sec would reduce the test cycle time by eliminating
the need for the leak detector to reach its most sensitive scale
during
each test cycle.
NOTE Activating the range stop extends the sensitivity requirements
for calibration, thus eliminating unnecessary calibration errors
(see Table 2-5).
Table 2-5 Range Stop/Sensitivity Requirements
Range Stop Max Gain MDL
OFF 6.9 5.00E-12
ON at
-11 6.9 5.00E-12
-10 10 5.00E-11
-9 20 5.00E-10
-8 50 5.00E-09
Manual Range Configures the leak detector so that it only displays the pre-selected
decade entered in the manual range variable field. For example,
if the manual range feature was enabled and the manual range
variable was set
to 10
06,
then the leak rate decade displayed on
the LED bar graph during testing would be the 10
06
atm cc/sec
range only. This feature is useful when the concern is only with
monitoring the leak rate measurement within a single decade.
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