Keysight Technologies USB data capturing module U2331A Input: 3 MS/s, output: 1 MS/s U2331A OPT 902 + ABD Manuale Utente
Codici prodotto
U2331A OPT 902 + ABD
38
U2300A Series DAQ Service Guide
2
Calibration
A/D Data Conversion
A/D data conversion converts analog voltage into digital
information. The following section illustrates the format of
acquired raw data for the A/D conversion.
information. The following section illustrates the format of
acquired raw data for the A/D conversion.
Below is the illustrated example of the acquired raw data
scan list for CH 101, CH 102, and CH 103.
scan list for CH 101, CH 102, and CH 103.
16-bit Data Format
12-bit Data Format
D - Data bits
X - Unused bits
Raw data conversion
To convert the data into an actual float number, we need
the voltage range and polarity information. Below are the
calculations on the raw data conversion for both bipolar and
unipolar.
the voltage range and polarity information. Below are the
calculations on the raw data conversion for both bipolar and
unipolar.
To perform a sample calculation of the conversion, take
the U2356A as an example. The resolution of U2356A is
16 bits and the range is taken as 10 V. The Int16b value
calculated using conversion algorithm is 12768.
the U2356A as an example. The resolution of U2356A is
16 bits and the range is taken as 10 V. The Int16b value
calculated using conversion algorithm is 12768.
#800000200
<byte>
<byte>
<byte>
<byte>
<byte>
<byte>
<byte>
<byte>
...
Data length indicator, The
next 8 bytes (0000 0200)
specifying the actual data
length only, not actual data.
Data length (200 bytes long)
next 8 bytes (0000 0200)
specifying the actual data
length only, not actual data.
Data length (200 bytes long)
1st data
LSB
1st data
MSB
1st data
LSB
1st data
MSB
1st data
LSB
1st data
MSB
2nd data
LSB
2nd data
MSB
...
CH 101
CH 102
CH 103
CH 101
...
LSB
MSB
DDDD DDDD
DDDD DDDD
LSB
MSB
DDDD XXXX
DDDD DDDD