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User Manual
ENTRY
ALC STATE
VOLT REF
California Instruments
DESCRIPTION
STAN
Power up in INT (internal) clock mode for stand-
alone operation. This is the only mode for models
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 cloc
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.
Sets the Auto Level Control (ALC) mode. This mode uses the
internal measurement system to zero regulate the output. There are
three modes of operation:
OFF
No measurement based output regulation.
REG Output regulation is enabled. AC source will continuously
regulate output but will not trip off output.
ON
Output regulation is enabled and output will fault (trip off)
with Error 801 "Output Voltage fault" if regulation cannot be
maintained and the programmed output voltage is 10Vrms
or higher. No error is generated for settings below 10 volt.
In most situations, the ALC mode should be set to REG or ON for
optimal performance.
Note: The ALC mode only functions for programmed output
voltages above 10 Vrms.
Selects internal or external voltage programming. Select INT for
programming of voltage from the front panel or over the bus. Select
EXT to use the RPV (remote programming voltage). Note that the
ALC mode must be set to OFF to change to external input/rpv input
mode. The RPV input expects a 0-10 Vdc signal for 0 to full-scale
voltage. Only one RPV input signal is available to drive all three
phases if the 2253 is in three phase mode. Thus, all three-phase
output amplitudes will track the same RPV input DC signal. The –
RPV option must be installed for this mode of operation.
This field should also be set to EXT for models that have the –EXT
(external input signal) option installed.
2253i / 2253iX
k
62
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