Keysight E1412A Digital Multimeter User Guide
cxxxix
READ?
Multimeter Command Reference
READ?
The
READ?
command is most commonly used with
CONFigure
to:
–
Place the multimeter in the wait-for-trigger state (executes the
INITiate
command).
–
Transfer the readings directly to the output buffer when the trigger is
received (same action as
FETCh?
but the readings are not stored in
internal memory as with the
FETCh?
command).
Subsystem Syntax
READ?
Comments
–
The
READ?
command is slower than the
INITiate
command since readings
are formatted and sent to the output buffer as they are taken. However, the
sample count and trigger count are not limited with
READ?
since memory
is not used.
–
This command causes the multimeter to start taking readings as soon as
its trigger requirements are met (same as the
INIT
command).
–
Each reading sent to the output buffer is terminated with a Line Feed (
LF
).
The GPIB End-or-Identify (EOI) signal is sent with the last byte transferred.
If multiple readings are returned, the readings are separated by commas
and EOI is sent only with the last byte.
–
The output buffer capacity is 128 bytes. The multimeter remains “busy”
with a full buffer until you begin removing readings from it.
–
Readings are placed directly in the output buffer and are not stored in
internal memory as with an
INIT
command. With
INIT
, a
FETCh?
command
is required to transfer readings from internal memory to the output buffer.
You may want to use the
READ?
mode of operation when readings need to
be taken at a continuous rate.
–
The rate the controller removes the readings from the multimeter needs to
match the rate the multimeter puts them into the output buffer to keep
from filling the output buffer. The multimeter will quit making
measurements until you remove readings from the output buffer and make
room in the output buffer for more readings.
–
Related Commands:
CONFigure
,
FETCh?
,
INITiate
Example
Transfer Readings Directly to Output Buffer
dimension array
Dimension computer array to store 100
readings.
Summary of Contents for E1412A
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