Keysight Technologies 3458A Guide D'utilisation page 146

4 Making Measurements
Overload indication
The multimeter indicates an overload condition (input greater than the present
range can measure) by storing the value ± 1E+38 in reading memory instead of a
reading. When overload values are recalled to the display, the value ± lE+38 is
displayed. When overload values are transferred from reading memory to the
GPIB output buffer, they are converted to the overload numbers for the specified
output format. Refer to
more information.
Recalling readings
You can recall readings from memory using the reading number or by a method
called "implied read". Regardless of the specified reading memory format, recalled
readings are output in the format specified in the OFORMAT command (refer to
Sending Readings Across the Bus
Before recalling readings, you may want to determine the number of readings
stored. This can be done using the MCOUNT? query command. The following
program returns the total number of stored readings.
10 OUTPUT 722;"MCOUNT?"
20 ENTER 722;A
30 PRINT A
40 END
Using reading numbers
The multimeter assigns a number to each reading in reading memory. The most
recent reading is assigned the lowest number (1) and the oldest reading is
assigned the highest number. Reading numbers are always assigned in this
manner regardless of whether the LIFO or FIFO mode is used. The RMEM
command allows you to use the reading number(s) to copy a reading or group of
readings from memory to the output buffer. The RMEM command does not
destroy readings in memory: it merely copies the reading(s) to the output buffer.
The RMEM command turns reading memory OFF. This means all previously stored
readings remain intact and new readings are not stored. The first parameter in the
RMEM command specifies the beginning reading (first parameter). The second
parameter (count) specifies the number of readings to be recalled, starting with
first. The third parameter (record) specifies the record from which to recall
readings. Records correspond to the number of readings specified in the NRDGS
or SWEEP command. For example, if you have specified four readings in the
146
Sending Readings Across the Bus
later in this chapter for more information).
later in this chapter for
Keysight 3458A User's Guide