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Some Basic
Commands
Here follows a description of some basic
CNT-8X commands that control the mea
-
surement sequence.
CONFigure
The CONFigure command sets up the
counter to do the measurement specified
by the parameters of the command. The
command gives a limited number of pa
-
rameter options such as:
–
Measurement function
–
Measurement channel
–
Number of measurements and sometimes
also the following:
–
Measuring time
–
Trigger level
The counter sets up the rest of its func-
tions in the best way for the requested
measurement. This means that any instru-
ment setting may be changed by this
command.
Examples:
–
Set up to measure frequency:
CONF:FREQ
–
Set up to do 100 frequency measurements:
CONF:ARRay:FREQ8(100)
–
Set up to do 100 frequency measurements
on the A-channel:
CONF:ARRay:FREQ8(100),(@1)
–
Set up to do 100 frequency measurements
on the A-channel. Expected frequency 10
MHz that should be measured with a reso
-
lution of 1 Hz.
CONF:ARRay:FREQ8
(100),10e6,1,(@1)
INITiate
The INITiate command will normally
start a measurement or measurement se
-
quence and store the result internally in
the CNT-8X. However the actual action
is to change the state of the trigger sub
-
system from “idle” to
“wait_for_bus_arming”. The result of
changing the state of the trigger subsys
-
tem depends on the programming of this
subsystem. For example it could be pro
-
grammed to do the following:
–
Make 1000 measurements.
–
Wait for a GET/*TRG and then start a
measurement.
–
Wait for a GET and then make 534 mea
-
surements.
–
Wait for an arming pulse and make one
measurement.
–
Wait for an arming pulse and make 234
measurements.
INITiate :CONTinuous
This command sets the counter in a mode
where it continues with a new measure-
ment immediately after it has finished the
previous one. This is done by not return
-
ing the trigger subsystem to the “idle”
state.
ABORt
This command stops the current measure
-
ment (if any), and sets the trigger subsys
-
tem to the “idle” state. This means that
the counter is only waiting for new com
-
mands.
FETCh?
The FETCh query retrieves measurement
data. It could either be a single value
(SCALar) or a series of values (ARRay).
7-4 Some Basic Commands
How to Measure Fast