Other Subsystems
In addition to the major functions (sub
-
systems), there are several other subsys
-
tems in the instrument model.
The different blocks have the following
functions.
n
CALibration
This subsystem controls the calibration of
the interpolators used to increase the res
-
olution of the counter.
n
DISPlay
Commands in this subsystem control
what data is to be present on the display
and whether the display is on or off.
n
FORMat
The FORMat block converts the internal
data representation to the data transferred
over the external GPIB interface. Com-
mands in this block control the data type
to be sent over the external interface.
n
MEMory
The MEMory block holds macro and in
-
strument state data inside the counter.
n
STATus
This subsystem can be used to get infor
-
mation about what is happening in the in
-
strument at the moment.
n
Synchronization
This subsystem can be used to synchro
-
nize the measurements with the control
-
ler.
n
SYSTem
This subsystem controls some system pa
-
rameters like timeout.
n
TEST
This subsystem tests the hardware and
software of the counter and reports er
-
rors.
n
TRIGger
The trigger block provides the counter
with synchronization capability with ex
-
ternal events. Commands in this block
control the trigger and arming functions
of the Timer/ Counter.
Order of Execution
–
All commands in the counters are sequen-
tial, i.e., they are executed in the same or-
der as they are received.
–
If a new measurement command is re-
ceived when a measurement is already in
progress, the measurement in progress will
be aborted unless XWAI is used before the
command.
5-4 Other Subsystems
Instrument Model
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