VXi VT1422A 사용자 설명서

3.  Next, create a custom linear EU conversion for the excitation voltage 
channel. This EU will create the ratio of the newly measured value divided 
by the original value. The first channel’s pre-INITiate excitation value 
measured by the MEAS:VOLT:EXC? query above will be used to create 
this EU. For this example, assume that this initial value was 5.60 V.

DIAG:CUST:MXB 1.0/5.60,0.0,(@10006)

SENS:FUNC:CUST:HVOL (@10006)

4.  Use the ratio inside the algorithm to adjust the DSP-computed value. 
After computing the corrected reading, the writefifo(), writecvt() or 
writeboth() algorithm calls can be used to send the corrected data to the 
FIFO and/or CVT. This is a code segment from the algorithm:

{
  float ratio;
  float chan0, chan1, chan2;

  /* get the ratio of new to initial excitation voltages */
  ratio = I10006;

  /* read and correct channel data */
  chan0 = I10000 * ratio;
  chan1 = I10001 * ratio;
  chan2 = I10002 * ratio;

  /* write corrected values to FIFO and the normal
     position in CVT for this channel */
  writeboth(chan0,

 

10);

  writeboth(chan1,

 

11);

  writeboth(chan2,

 

12);

  writeboth(chan3,

 

13);

} /* end of code segment */

5.  Download the algorithm and start scanning.

6.  Read the data with SENS:DATA:FIFO? This data will be corrected strain 
readings. Note that the data order in the FIFO will be channel 10006, 10000, 
10001, 10002.

Doing these corrections in an algorithm will increase the duration of the 
Execute Algorithm phase of the VT1422A operational cycle (see 
Figure 6-2 on page 195) and can slow down the frequency at which the 
VT1422A can scan channels. For this reason, this method should be limited 
to only those channels needed for the algorithms.