Fluke PM-3380B, PM-3390B Making automatic measurements, Application summary, FETChNWIDth?

A - 2 APPLICATION PROGRAM EXAMPLES

A.1 Measuring Signal Characteristics

Measuring signal characteristics can be done in either of the following ways:

1)Using the measurement instructions. Example A.1.1 shows how to do that automatically by letting the CombiScope instrument select the best possible settings. Example A.1.2 shows how to do that after programming your own instrument settings.

2)Using the DISPlay:WINDow:TEXT<n>:DATA? query to read signal values as measured by the MEAS1 & MEAS2 features of the CombiScope instrument (refer to example A.1.3).

A.1.1 Making automatic measurements

In the following example the frequency, amplitude, period, positive and negative pulse width of the Probe Adjust signal are measured and displayed 10 times. This is done automatically by using the CONFigure, READ?, and FETCh? measurement instructions.

Application summary:

•Connect a 10:1 probe between channel 1 and the Probe Adjust signal (2000 Hz, 600 mV).

•Configure for measuring the Probe Adjust voltage of 600 mV and frequency of about 2000 Hz by sending:

CONFigure:VOLTage:FREQuency (0.6),2000,(@1)

•Send the following queries 10 times and read the corresponding responses:

READ:FREQuency? Initiates and fetches a frequency measurement.

FETCh:AMPLitude?	Fetches the measured amplitude.
FETCh:PERiod?	Fetches the measured period.
FETCh:PWIDth?	Fetches the measured positive pulse width.
FETCh:NWIDth?	Fetches the measured negative pulse width.

•Print the received signal characteristics. Notice that the sum of the positive and negative pulse width equals the period, and that the inverse period equals the frequency.

Application program:

Note: The program is also supplied on floppy under file name EXAPPA11.BAS.

REM $INCLUDE: ’QBDECL.BAS’
DECLARE		SUB errorcheck ()
DIM	res	AS STRING * 100	’Dimension response string
DIM	cmd	AS STRING	’Declare command string
EndEOI%		= 1	’Termination Send on LineFeed & EOI