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Appendix A: Glossary
Common Mode Voltage
voltage swings. When this is measured on the SDAIBB it is calculated
with all voltage readings taken in reference to GND of the SDAIBB as
IN
IN
. Note that when one of the inputs is connected to GND of
2
the SDAIBB the common mode voltage changes as the differential voltage
changes.
Differential Voltage
such as the two leads on a thermocouple. When this is measured on the
SDAIBB it is calculated with all voltage readings taken in reference to
GND of the SDAIBB as
Gain G : The amount by which the input is multiplied before it is output.
V
out
Gain
IN
IN
Impedance Mismatch: When the output impedance of sensor is different
enough from the input impedance of the data acquisition device to cause
improper sensor readings.
Negative Input Differential: When the voltage and IN- is higher than the
voltage at IN-.
IN
Negative Rail: The lowest possible voltage that can be output. For the
SDAIBB there is a negative rail internal to the buffer and a negative rail on
the output of the buffer.
Positive Rail: The highest possible voltage that can be output. For the
SDAIBB there is a positive rail internal to the buffer and a positive rail on
the output of the buffer.
SDAIBB3599 Manual
B&B Electronics Mfg Co Inc – 707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax 815-433-5104
V
: The voltage about which a differential
CM
V
: The difference in voltage across two points
DIFF
IN
IN
.
IN
0
A-1
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