AMETEK Ls Series - Manual (Page 69)

User Manual Lx / Ls Series
65
ENTRY DESCRIPTION
should be used.
SYNC Selects the external sync mode if available. Default is internal sync,
which means a free running time base. The timebase can be
synchronized to either the AC line frequency (-LNS option) or an
external sync signal (-EXS option) depending on the installed option.
CLOCK Selects internal or external clock source. The Lx/Ls Series controller
uses an open-air crystal time base with an accuracy of 100 ppm. The
external clock mode is used to support the
–LKS option. For use as
an auxiliary unit in a clock and lock system, this field must be set to
EXT. A unit with
–LKS option can be used stand-alone if needed by
setting the INT clock mode.
INT Default, internal clock.
EXT Auxiliary unit (-LKS) driven by master (-LKM) clock
input.
Note: When selecting EXT mode, make sure the
Clock and Lock BNC cables are connected to the
Master (-LKM) unit. If not, there will be no output on
the
–LKS unit. See section 3.9 for connection
information.
MODE Power on clock mode. The following two modes can be selected.
STAND Power up in INT (internal) clock mode for stand-
alone operation. This is the only mode for Lx/Ls unit
without the
–LKS option.
For units with the –LKM option installed, this field is
fixed to CLK/LOCK.
For units with the
–LKS option installed, this field can
be changed to CLK/LOCK for use as an auxiliary
unit in a clock and lock system or to STAND for use
as a stand alone unit.
CLK/LOCK Fixed on master (-LKM) unit configuration in a clock
and lock system. Power up with EXT (external) clock
mode on unit with
–LKS option. (See OPTION menu
section.).
Note that this field cannot be changed if the
–LKM
option is installed.
The frequency resolution below 81.9 Hz in MAST
clock and lock mode is reduced to 0.1 Hz from the
normal 0.01 Hz.
If the
–HF option is installed, frequency resolution on
the –LKM unit is fixed at 1 Hz.