B&B Electronics SDAIBB 사용자 설명서

 

SDAIBB1300 Manual 

 

9 

 
The output offset is the amount by which the output is shifted.  

Equation 1 shows how the output offset affects the output of the buffer.  
The negative output rail will clip any reading that has a negative input 
differential unless the buffer’s output offset is raised.  For this purpose, 
output offsets of 0 V and 2.5 V are individually jumper selectable for each 
channel on the SDAIBB when mated with a compatible data acquisition 
model.  JP5 corresponds to channel A, JP6 corresponds with channel B, 
JP7 corresponds with channel C, and JP8 corresponds with channel D.   

 
An output offset of 0 V is always available.  See Table 4 for a list 

of models that support the 2.5 V output offset.  An output offset of 0 V is 
used for positive only differentials, and an output offset of 2.5 V provides 
the maximum input range for signals that run equally positive and negative.   

 
A different output offset may be brought in on the terminal blocks 

with the output offset jumper removed on the corresponding channel. 

The gain is individually selectable on each buffer with a two-

position jumper.  Gains of 1 and 22.28 are conveniently provided on the 
unit for each buffer.  JP1 controls the gain on channel A, JP2 controls B, 
JP3 controls C, and JP4 controls D.  Unity gain is ideal for eliminating the 
impedance mismatch between input devices and the data acquisition 
module.  Table 5 shows the maximum voltage ranges that can be amplified 
by the provided gain of 22.28.  To change the gain, leave the jumper in the 
User/22.28 gain position, remove the through-hole 4.7 k

Ω

 resistor, and 

replace it with the appropriate value.  See Table 6 for some standard inputs, 
gains, and appropriate resistor values to achieve the expected gain.   

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