User`s manual

Using Combined Unsigned Data
The Combined Segment Lists transfers both the arbitrary waveform
segment data and marker pulses to the AFG (see Chapter 6 for information
on marker pulses). You can use either the Signed or Unsigned number
format for the list.
The Combined Segment List can be sent as a comma separated list (see “Using
Signed Data to Generate Waveforms” on page 225), or as Definite Length or
Indefinite Length Arbitrary Block Data (see “Using Definite Length Arbitrary
Blocks to Transfer Data” on page 231 and “Using Indefinite Length Arbitrary
Blocks to Transfer Data” on page 235, respectively).
This section shows how to transfer the lists as DAC codes using the
Unsigned number format.
Note The AFG can only accept a single number format at a time. Thus, if the
AFG currently contains Signed data and you wish to send Unsigned data,
you MUST delete the data in memory first before enabling the AFG to
receive Unsigned data.
Using the
Combined List with
the Unsigned
Number Format
This section shows how to setup the AFG to receive a combined list in the
Unsigned number format and how to generate the list from voltage values.
Transferring the List in
the Unsigned Number
Format
With the AFG set to receive codes in the Unsigned number format, it receives
the codes as unsigned or offset binary numbers. Use the
[SOURce:]ARBitrary:DAC:FORMat UNSigned command to select the format.
Determining the Codes
in the Unsigned
Number Format
For outputs into matched loads and with the amplitude set to maximum
(+5.11875V), the following DAC codes generate the following outputs:
Code -32768 outputs 0 V
Code 0 outputs -5.12 V or negative full scale voltage
Code -8 outputs +5.11875 V or positive full scale voltage
Chapter 7 High Speed Operation 245