National Instruments SCC-LP04 用户手册

The SCC-LPXX is calibrated at the factory before shipment. If you want to 
calibrate the SCC-LPXX in your system, you need a voltage source capable 
of providing a DC voltage up to  

±10 V that is several times more accurate 

than the SCC itself.

To calibrate the SCC-LPXX, complete the following steps for each channel 
of the module:

1.

Select the desired SCC-LPXX channel (X or X

+8) on the E Series DAQ 

device.

2.

Set the gain on the E Series DAQ device so that the E Series input 
range is

±5 V.

3.

Connect the voltage source to the screw terminals of the desired 
channel on the SCC-LPXX.

4.

Input 9 VDC to the SCC-LPXX.

5.

Using your software, have the E Series DAQ device read the desired 
channel on the SCC-LPXX. Record the value.

6.

Input 0 VDC to the SCC-LPXX.

7.

Have the E Series DAQ device read the channel again and record the 
new value.

8.

Calculate the difference between the two values you recorded 
(first reading – second reading).

9.

Adjust the appropriate trimpot (X or X

+8) on the top of the SCC-LPXX. 

Repeat steps 4 through 8 until the difference you get in step 8 
equals 9 V.

For example, you connect 9 VDC to the input of CH (X) and the E Series 
DAQ device reads 9.05 V at the SCC output; then you connect 0 VDC to 
the input of CH (X) and the E Series DAQ device reads –0.01 V at the SCC 
output. Subtract the second value from the first (9.05 – (–0.01)) to get a 
difference of 9.06 V. Because the difference is not equal to 9 V, you adjust 
the trimpot until the difference in outputs equals 9 V.

In this example there may be an offset voltage such that the final voltages are 9.01 V 

and 0.01 V for a difference of 9 V. The SCC-LPXX trimpot adjusted in step 9 adjusts only 
for gain errors and does not compensate for this offset voltage.