Chapter Two: Installation
146 Set Up
37
New Configuration Warning Code (C11)
Under most circumstances, when there is a configuration change in the 146 unit, a warning code
(C11) is displayed and an alarm audio tone goes off when the unit is powered up again. The
alarm sound is silenced by pressing the [
QUIET
/
CANCEL
] key. This also deletes the C11 code
from the front panel window. The purpose of the warning code and alarm sound is to remind
you that there may be parameter changes within the unit caused by the configuration change. If
there is a change, it will involve resetting of parameters to their default values for one or more
channels.
Note
The beginning of this section describes what happens in most instances
when there is a configuration change in the 146 instrument. The
exceptions to this general description are discussed at the end of this
section under the title Exceptions.
The recommended procedure for installing boards, explained in the previous section, avoids
altering any user-defined parameters. The C11 warning code and alarm are still activated,
however, when a new board is added because this still entails a configuration change. All
parameters associated with the new board are set at default values.
If a board is removed from the unit, and not replaced with the same type board, the code and
alarm are activated upon power up. Also, the user-defined parameters in any transducer boards
installed in higher numbered slots, go to default values. The channel numbers associated with
those boards are also changed if a transducer board (of any type), is not installed to replace the
removed board.
For example, assume the 146 unit has three transducer boards installed. There are Capacitance
Manometer boards in slots one and two (corresponding to channels 1 and 2), and a Cold Cathode
board in slot three (channel 3). If a Capacitance Manometer board is removed from slot two, the
Cold Cathode board (previously channel 3) becomes channel 2, and all user-defined parameters
for the cold cathode change to default values. The parameters associated with channel 1 remain
unchanged because the channel number for that board has remained unchanged.
If a board is not changed, but the gauge attached to the board is replaced, the C11 code and alarm
are not activated, however, there still may be parameter changes within the unit. Whether or not
there are parameter changes depends upon if the gauge is being replaced with another gauge of
the same type (no parameter changes), or if the user-defined parameters are valid and appropriate
for the new type of gauge. For example, replacing a 120 capacitance manometer with a 107
capacitance manometer might entail parameter changes. If the user-defined sensor range entered
for the Type 120 gauge is valid for the Type 107 gauge, then it is preserved. If the user-defined
sensor range is not valid, however, the sensor range changes to the Type 107 default value.
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