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Hardware Used
Making Multimeter
Measurements
MEASure Command
READ? Command
INIT and FETC?
Commands
Chapter 2
486 IBM compatible computer running Windows 3.1. The computer has an
HP 82341 HP-IB interface and HP SICL/Windows 3.1 and Windows NT
for HP-IB software. The VXI modules were loaded in a VXI C-size
mainframe using an HP E1406A or B-size mainframe with HP E1306A
Command Module as resource manager connected to the computer via the
HP 82341 HP-IB card.
This section provides four programs that demonstrate different ways of
making measurements and retrieving the readings. SCPI command
sequences for each program are contained in the boxes. The four programs:
1. Use the
MEASure
2. Make several externally triggered measurements.
3. Maximize measurement speed on multiple measurements.
4. Maximize measurement accuracy on multiple measurements.
NOTE: Review the section titled "Triggering the Multimeter" beginning on
page
45
to fully understand the triggering system.
The simplest measurement method is using the
configures the function to be measured, initiates the measurement(s) and
places the reading(s) directly into the output buffer. You then must provide
the I/O construct to retrieve the readings and enter them into the computer.
One
command will initiate multiple measurements if the trigger
MEASure
count or the sample count is greater than 1. The measurement process stops
when the output buffer fills if readings are not retrieved fast enough. The
measurement process restarts when there is again room to store readings in the
output buffer.
The
command requires that you configure the multimeter for the
READ?
function you want to measure prior to issuing the command. The command
initiates the measurement(s) and places the reading(s) directly into the output
buffer like the
MEASure
to retrieve the readings and enter them into the computer. One
command will initiate multiple measurements if the trigger count or the
sample count is greater than 1. The measurement process stops when the
output buffer fills if readings are not retrieved fast enough. The measurement
process restarts when there is room to store readings in the output buffer.
The
READ?
command is broken down into two operations with the
commands. The
FETC?
configure the multimeter for the function you want to measure prior to
issuing the commands. The
places the reading(s) into the multimeter's RAM memory. This memory will
hold a maximum of 512 readings. You use the
the readings from memory to the output buffer. You then must provide the
I/O construct to retrieve the readings and enter them into the computer. One
command will initiate multiple measurements if the trigger count or the
INIT
sample count is greater than 1. If more than 512 measurements are made,
only the last 512 readings are stored. Use the
than 512 readings since readings are immediately put into the output buffer
and retrieved with an I/O construct you supply. The measurement process
stops when the output buffer fills if readings are not retrieved fast enough.
HP E1312A/E1412A Multimeter Application Information
command to make a single measurement.
MEASure
command. You then must provide the I/O construct
and
commands require that you
INIT
FETC?
INIT
command initiates the measurement(s) and
FETC?
READ?
command which
READ?
INIT
and
command to transfer
command for more
53
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