Agilent Technologies Helium User Manual page 116

Technical Information
Range
Activating the range stop extends the sensitivity requirements for calibration, thus
NOTE
eliminating unnecessary calibration errors (see the following table).
116
Configures Minimum Range (Range Stop) and Only Show Range
(Manual) Leak Rate options
Only Show 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 E-6, then the
leak rate decade displayed on the LED bar graph during testing
would be the E-6 atm cc/sec range only. This feature is useful
when the concern is only with monitoring the leak rate
measurement within a single decade.
For example, if the Only Show Range feature was enabled and
the Only Show Range variable was set to 10
decade displayed on the LED bar graph during testing would be
the 10 -06 atm cc/sec range only.
Minimum Range - Configures the leak detector so that it only

auto-ranges down to the pre-selected decade. To allow auto-
ranging to the maximum sensitivity of the system, turn
Maximum Range 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 <
E-11 atm cc/sec, but the test specification is only in the E-7 atm
cc/sec range, then setting the range stop to E-8 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. Activating the Minimum Range extends the sensitivity
requirements for calibration, thus eliminating unnecessary
calibration errors.
Agilent Helium Leak Detector User Manual
-06 , then the leak rate