Keysight Technologies USB data capturing module U2331A Input: 3 MS/s, output: 1 MS/s U2331A OPT 902 + ABD 用户手册

产品代码
U2331A OPT 902 + ABD
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页码 71
32
U2300A Series DAQ Service Guide
2
Calibration
Adjustment Procedures
DAQ on- board 5 V calibration
If in the performance verification procedure is not accurate, 
adjustment procedure is required. The following flowchart 
shows the steps for 5 V calibration.
Figure 2-14 The flowchart showing the steps for 5 V calibration
Step 2: 5 V calibration
Connect the DAQ device to the computer with USB cable.
Monitor the DMM readings.
Tune the 5 V until you get the voltage in between 4.9999 to 5.0001 V.
Send “
CAL:VREF:TUNE MINUS” (to decrease voltage),
Send “
CAL:VREF:TUNE PLUS” (to increase voltage),
Send “
CAL:VREF” (to save to EPROM)
Step 1:
Open the DAQ device metal casing.
Power on DAQ device and warm up for 30 minutes.
Connect the DMM to U37 on the daughter board.
Step 3:
After save to EPROM, 
power cycle the unit.
Step 4:
Reconfirm the 5 V 
reading.