D/A Reference Voltage; Ao Data Format - Agilent Technologies U2300A Series User Manual

D/A reference voltage

AO data format

#800000200
Data length indicator, The next 8 bytes
(0000 0200) specifying the actual data
length only, not actual data. Data length
(200 bytes long)
U2300A Series USB DAQ User's Guide
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.
Data format for single channels arbitrary AO (when either
one channel is enabled and USER mode)
<byte> <byte> <byte> <byte> <byte> <byte> <byte> <byte> ...
1st data 1st data 2nd data
LSB MSB LSB
CH 201/202 CH 201/202
Features and Functions
2nd data 3rd data 3rd data
MSB LSB MSB
CH 201/202
3
4th data 4th data ...
LSB MSB
...
CH 201/202
55