Agilent Technologies E1326B Manual do Utilizador descarregar pdf (Página 208)

Converting Four-Byte

and Two-Byte Readings

Four-byte readings and two-byte readings are converted to voltages and

resistances as follows.

Four-Byte Readings

1. The four-byte reading should be arranged into a single 32-bit

variable. The upper two bytes from the first Data Register read must

be the most significant word, the lower two bytes from the second

Data Register read must be the least significant word.

2. The 32-bit quantity is then shifted 8 bits to the left to remove the

eight reading header bits (effoprrr). Note that this header is used to

determine overrange conditions, and contains the function and range

opcodes.

3. The reading is calculated as:

converted_reading = (range * shifted_reading)/0x7FFFFF00

where range is the multimeter’s voltage or resistance range and

0x7FFFFF00 is the full scale reading for the given range in hexadecimal.

The “Programming Examples” section contains examples for

converting four-byte readings.

Two-Byte Readings

1. After the two-byte reading is retrieved from the Data Register, the

reading is shifted one bit to the right to remove the error bit. Note

that this bit is used to determine overrange conditions.

2. The reading is calculated as:

converted_reading = (range * shifted_reading)/0x3FFF

where range is the multimeter’s voltage or resistance range

and

0x3FFF is the full scale reading for the given range in hexadecimal.

The “Programming Examples” section contains examples for

converting two-byte readings.

Appendix C HP E1326B/E1411B Multimeter Register-Based Programming 209

1 2 ... 203 204 205 206 207 208 209 210 211 212 213 ... 290 291

Sem comentários

Agilent Technologies E1326B Manual do Utilizador Página 208