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

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

a) 4-wire voltage output mode

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

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.

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.

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.

a) 4-wire voltage output mode:

b) 3-wire voltage output mode

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

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

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

c) Current output mode

c) Current output mode: USB DAQ Configuration

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.

c) Current output mode:

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.

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

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.

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

Thanks!

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

How to create the model file: (2), then you can change the value as you want, for example we change the Vref (V) from 4.096 to 4.

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

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):

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 4.096 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.