1. Use USB_DAQ to Complete the Calibration of PGA308 EVM
Iven Xu
Mar. 13th, 2013
Thanks to Ian Williams

2. Agenda USB_DAQ and PGA308 EVM overview
Calibration principle of PGA308 EVM
Three output mode of PGA308 EVM
4-wire voltage output mode
3-wire voltage output mode
Current output mode
Multi-Calibration principle of PGA308

3. a) 4-wire voltage output mode

4. a) 4-wire voltage output mode:
USB_DAQ Board Default Configuration:

5. a) 4-wire voltage output mode:
PGA308 EVM Default Configuration:
T1 and T2 of USB_DAQ need not
to connect anything.
Notice only in current output mode,
we should connect the +-15V to T2
and 24V to T1.

6. a) 4-wire voltage output mode:
Firstly, we should make sure we have selected “Run out of RAM” in “Block Diagram”:
Then, move to “Calibration”. Make sure the step 1 ~ step 3 as the same of below fig:
Thirdly, click “select Cal Preset” in step 4 and select “pre_vout_4p096.csv” for voltage output.
Then, click “Calibrate” in step 6 and follow the prompted window to change the output of sensor.

7. a) 4-wire voltage output mode:
About the OTP Program, note that you only have 4 times. So before your calibration is completed, do not use OTP program.

8. a) 4-wire voltage output mode:

9. b) 3-wire voltage output mode

10. b) 3-wire voltage output mode:
USB_DAQ Board Default Configuration:

11. b) 3-wire voltage output mode:
PGA308 EVM Default Configuration:

12. b) 3-wire voltage output mode:
Pre-cal file : pre_OW_to_vo_4p096.csv

13. c) Current output mode

14. c) Current output mode:
USB DAQ Configuration

15. c) Current output mode:
PGA308 EVM Configuration
* When we want to use current output mode of
XTR117:
* we should make sure the configuration of
PGA308 is in 4-wire voltage output mode;
* Because in 3-wire voltage output mode of PGA308, we should turn on/off the Vs of PGA308. But in 3-wire mode, the one-wire and
Vout is connect in one junction, so we cannot
use one-wire to control the Vs (turn on/off).
* conclusion:
is we should use 4-wire voltage output
for current output.

16. c) Current output mode:

17. c) Current output mode:
Firstly, we should make sure we have selected “Run out of RAM” in “Block Diagram”:
Then, move to “Calibration”. Make sure the step 1 ~ step 3 as the same of below fig:
Thirdly, click “select Cal Preset” in step 4 and select “pre_Iout_4p096.csv” for current output.
Then, click “Calibrate” in step 6 and follow the prompted window to change the output of sensor.

18. c) Current output mode:
We can use
the Graph to
monitor the
output.
Also, we can
use Multi-meter
to monitor the

19. c) Current output mode:
About the OTP Program, note that you only have 4 times. So before your calibration is completed, do not use OTP program.

20. Multi-Calibration principle of PGA308:
Need to update later.

21. Thanks!

22. How to create the model file:
(1), click the “Load Preset From….”, select a exist file like “pre_vout_4p096.csv”

23. How to create the model file:
(2), then you can change the value as you want, for example we change the Vref (V) from to 4.

24. How to create the model file:
(3), then click the “Save Preset to File”, write a name like “pre_cal.csv”, then click “Save”.

25. How to create the model file:
(4), Then re-click the “Load Preset From…”, select the “pre_cal.csv” we saved in the last step (3):

26. How to create the model file:
(5), then the value should be the same as you just changed in step (2) (we changed Vref from to 4).
(6), then click the “OK”, now finished the preset file.
(7), then you can do the calibration in “step 6” of
PGA308 software.