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D/A reference voltage
By default, the internal reference voltage is 10 V. However, external reference can
be supplied through the external reference input pin (AO_EXT_REF). The range of
the DAC output is directly related to the reference. The analog output voltage can
be generated by multiplying the digital codes that are updated with the 10 V as
internal reference. Therefore, when 10 V is taken as the internal reference, the full
range would be –10 V to +9.9951 V in bipolar output mode, while 0 V to 9.9976 V
in unipolar output mode.
While using an external reference, the different output voltage ranges can be
achieved by connecting different reference voltage. For example, if connecting a 5
VDC with the external reference (AO_EXT_REF), then the range from –4.9976 V to
+5 V in the bipolar output can be achieved. The tables below illustrates the
relationship between digital code and output voltages.
AO data format
Data format for single channels arbitrary AO (when either one channel is enabled
and USER mode)
#800000200
Data length indicator, The next 8 bytes
(0000 0200) specifying the actual data
length only, not actual data. Data
length (200 bytes long)
Data format for two channels arbitrary AO (when two channels are enabled and
USER mode)
#800000200
Data length indicator, The next 8 bytes
(0000 0200) specifying the actual data
length only, not actual data. Data
length (200 bytes long)
Keysight U2300A Series User's Guide
<byte> <byte> <byte> <byte> <byte> <byte> <byte> <byte> ...
1st data
1st data
2nd data
LSB
LSB
MSB
CH 201/202
CH 201/202
<byte> <byte> <byte> <byte> <byte> <byte> <byte> <byte> ...
1st data
1st data
1st data
LSB
MSB
LSB
CH 201
Features and Functions
2nd data
3rd data
MSB
LSB
CH 201/202
1st data
2nd data
MSB
LSB
CH 202
CH 201
3rd data
4th data
4th data
MSB
LSB
MSB
CH 201/202
2nd data
2nd data
2nd data
MSB
LSB
MSB
CH 202
3
...
...
...
...
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