User manual

40 U2300A Series DAQ Service Guide
2 Calibration
There are unused bits in the 12- bit data format.
Therefore, there is a need to perform a 4- bit right shift
operation. Hence, the 12 bits binary read back calculation
will be as follows.
Bipolar:
Unipolar:
LSB MSB
<00011110> <00000011>
= 798
NOTE
The raw data provided by U2300A series DAQ devices is in the byte order
of LSB first.
Converted value
2 Int16 value×
2
resolution
--------------------------------------
⎝⎠
⎛⎞
Range×=
Example of converted value
2798×
2
12
------------------
⎝⎠
⎛⎞
10× 3.896 V==
Converted value
Int16 value
2
resolution
----------------------------
0.5+
⎝⎠
⎛⎞
Range×=
Example of converted value
798
2
12
---------
0.5+
⎝⎠
⎛⎞
10× 6.948 V==
NOTE
• The converted value is of float type. As such, you may need to type cast
the Int12 value to float in your programming environment.
• For the U2331A, there is a need to perform a 4-bit right shift operation.
This is because it is equipped with 12-bit ADC, and the last 4 bits are
truncated.