Varian 990 dCLD II, Operation Manual

Page: 59 / 162

Model 990 dCLD II Component Leak Detector
3-9
MANUAL EXPONENT The MANUAL EXPONENT is the exponent value that you want
Manual Range to display when Manual-Ranging is set to ON.
To set the exponent, use the INIT-EXPONENT<CR> command, or if
the optional front control panel is installed, set the MANUAL
RANGE parameter via the Leak Rate Ranging Set-Up screen (see
Section 4.6.4 “Range Stop and Manual Range Set Up and Control”
on page 4-15).
RANGE STOP The RANGE STOP feature configures the 990 dCLD II so that it
only auto-ranges down to the pre-selected decade entered in the
range stop variable field, as opposed to all four decades beginning
at the TOP RANGE. For example, if RANGE STOP is enabled and
set to
−
07, then the most sensitive range that the leak detector dis-
plays is 10
−
07
.
This feature is useful when a product specification is more than one
decade less stringent than the sensitivity of the leak detection sys-
tem as it is configured. If the configured system is capable of
detecting 10
−
09
atm cc/sec but the test specification is only in the
10
−
07
atm cc/sec range, then setting the RANGE STOP to
−
08
reduces the test cycle time by eliminating the need for the leak
detector to reach its most sensitive decade (10
−
09
) during each test
cycle.
To set the RANGE STOP exponent, issue the INIT-RANG-
ESTOP<CR> command, or if the optional front control panel is
installed, set the RANGE STOP parameter via the Leak Rate Rang-
ing Set-Up screen (see Section 4.6.4 “Range Stop and Manual
Range Set Up and Control” on page 4-15).
ENABLE-IDLE
DISABLE-IDLE The ENABLE-IDLE command allows the control unit to be put into
IDLE or RUN mode. The factory default setting is DISABLE-IDLE.
Issue the ENABLE-IDLE<CR> command to allow the control unit to
be put into RUN or IDLE mode. If IDLE is DISABLEd, the
990 dCLD II will operate without asserting the IDLE/RUN input
(J3/5) in the discrete I/O.