Fluke PM6685R Some Basic Commands, CONFigure, INITiate CONTinuous, ABORt, FETCh?, Examples

How to Measure Fast

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:FREQ￿(100)

–Set up to do 100 frequency measurements on the A-channel:

CONF:ARRay:FREQ￿(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:FREQ￿ (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