Output Termination; Using The Sint Or Dint Output Format; Overload Indication; Sint Example - Agilent Technologies 3458A User Manual

Overload Indication

Output Termination

Using the SINT or
DINT Output Format

SINT Example

Note
When using the SINT or DINT memory/output format, the multimeter
applies a scale factor to the readings. The scale factor is based on the
multimeter's measurement function, range, A/D converter setup, and
enabled math operations. You should not use the SINT or DINT format for
frequency or period measurements; when a real-time or post-process math
operation is enabled (except STAT or PFAIL); or when autorange is
enabled.
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Single Real (SREAL) or Double Real (DREAL) Unlike the SINT and
DINT formats, readings output in SREAL or DREAL format are not scaled
and can be used with any measurement function/multimeter configuration.
(Since there is no scale factor, the SREAL and DREAL formats are ideal
when autoranging and/or a math function is enabled.) The DREAL format
has the added advantage that no conversion is necessary by the controller.
Use the SREAL, format for measurements with £6.5 digits of resolution.
Use the DREAL format for measurements with >6.5 digits of resolution.
The OFORMAT command specifies the output format for readings (the
power on and default format is ASCII). For example, to select the double
integer format, send:
OUTPUT 722;"OFORMAT DINT"
The multimeter indicates an overload condition (input greater than the
present range can measure) by outputting the largest number possible for the
particular output format as follows.
SINT format: +32767 or -32768 (unscaled)
DINT format: +2.147483647E+9 or -2.l47483648E+9 (unscaled)
ASCII, SREAL, DREAL: +/-l.OE+38
Each reading output to the GPIB in ASCII format is normally followed by
cr lf (carriage return, line feed). The cr lf indicates the end of transmission
to most controllers. Readings output in any other format do not have the cr
lf end of line sequence. With any output format, you can enable the GPIB
EOI (End Or Identify) function to mark the end of transmission. Refer to the
END command in Chapter 6 for more information.
The ISCALE? command returns the scale factor (in ASCII format) for
readings output in the SINT or DINT format. (After the controller retrieves
the scale factor, the output format returns to the specified SINT or DINT
format.) You can retrieve the scale factor after the multimeter is configured
but before readings are triggered, or after all readings are completed and
transferred to the controller. (If a reading is in the output buffer when the
ISCALE? command is executed, the reading will be overwritten by the scale
factor.)
The following program outputs 10 readings in SINT format, retrieves the
scale factor and multiplies the scale factor times each reading. The readings
are transfcrred to the controller using the TRANSFER statement (this
Chapter 4 Making Measurements 99