Multi-Cal PGA309 Problem and questions

I want to attach the Multi-Cal files so i write a new thing.

I'll send a link to the latest software on Monday.  I think you already have it though as you said you are using version 2.1.

Hello Daekeon,

Please accept my friend request so I can send you link to software.

Hello^^
I accept your friend request.
but i don't know what's software that you will link.

Daekeon Woo,

I had Pete Semig send you the latest version of the software because of your comment “I want to attach the Multi-Cal files so i write a new thing.” As I mentioned in previous forum postings version 2.1 is the latest software. I assumed your comment meant that you needed the latest software.

Note: I tested the existing software and did not have any issue programing the EEPROM. I do not, however, use the re-run calibration option. This may be your issue.

best regards,

Yes~ I received the latest software(ver. 2.1). Thank you^^

Kay, I have two questions.

First, now i use External Temp Sensing by pressure sensor temperature character and i set the "Temp ADC resolution" 11 bits.

I wonder if 15 bits ADC resolution is better than 11 bits on temperature change.

Second, i calibrate 3-points(-10 / 25 / 80 degrees). After finishing calibration, i check the EEPROM data to know calibration data is saving properly.

I can see the -10 degree Temp ADC value at 'T16' and 80 degree Temp ADC value at 'T0'.

but There isn't 25 degree Temp ADC value from T1 to T15. It is same to every calibrated product. After calibration, I check output by changing temperatures and

the output at -10 and 80 degrees is good but at 25 degree, most of output is bad. Some are improper values compared my pressure sensors accuracy spec(0.5%F.S. in case of DC4-20mA current type, the output value must be 3.920mA ~ 4.080mA at Low pressure and 19.920mA ~ 20.080mA at high pressure)

I want know this issue's cause. Please help me to solve the problem.

I will send you EEPROM data and Temp ADC value each of temperatures tomorrow.

Thank you very much for cooperation^^

 

Question 1:
First, now i use External Temp Sensing by pressure sensor temperature character and i set the "Temp ADC resolution" 11 bits. I wonder if 15 bits ADC resolution is better than 11 bits on temperature change.

Answer 1:

The only disadvantage to using high resolution is that it will slow the temperature conversions. In general, temperature changes very slowly, so it doesn’t matter if the temperature conversion are slow. So, for that reason, most people set the resolution of the A/D converter to the maximum value.

 

Question 2:

Second, i calibrate 3-points(-10 / 25 / 80 degrees). After finishing calibration, i check the EEPROM data to know calibration data is saving properly.
I can see the -10 degree Temp ADC value at 'T16' and 80 degree Temp ADC value at 'T0'. but There isn't 25 degree Temp ADC value from T1 to T15. It is same to every calibrated product. After calibration, I check output by changing temperatures and the output at -10 and 80 degrees is good but at 25 degree, most of output is bad. Some are improper values compared my pressure sensors accuracy spec(0.5%F.S. in case of DC4-20mA current type, the output value must be 3.920mA ~ 4.080mA at Low pressure and 19.920mA ~ 20.080mA at high pressure)

 

Answer 2:

1. You are having this issue with the multi-cal-system. Have you tried calibrating a single sensor module using the PGA309EVM? The EVM and multi-cal use the same calibration methods, but the PGA309evm is much simpler. You should always start with successfully calibrating on the PGA309EVM first.
2. Also, you should test your hardware and pre-cal configuration using a sensor emulator first. This makes sure that the hardware design is correct and your files are structured properly. Have your tried the sensor emulator?
3. Please send me your full schematic.
4. Please send me your sensor output at -10C, 25C, and 80C (in mV/V) for minimum pressure, mid pressure, and maximum pressure.
5. Please send me your pre-cal files.
6. Please send me your temperature sensor output voltage at -10C, 25C, and 80C.
7. With all the information above I can emulate your exact sensor calibration scenario. If there is a problem with your hardware, or your pre-cal file, I will be able to identify the issue.
8. Note that the software has been tested so something is likely wrong with your configuration.
9. Another potential problem is that your sensor output values are not stable. If your sensor has hysteresis, if the chamber temperature is not stable, or if the pressure source is not stable you will not get good calibration results.
10. Important Note: during our last email, I identified that you were exceeding the output swing range. You were trying to output 5V from the PGA309, but you cannot do this. The maximum you can output is 4.9V on a 5V supply.

Hello^^

    I need the new version 2.1.Could you send me? Thank you!

Hello,

Here's a link to version 2.1: txn.box.com/.../pd584yo9l4k6l8l8rwesmbxfeqon1jw9

Please be advised that I am nearly finished with a new version (2.3) that has a number of improvements. It will be posted to the TI website in the next few weeks.

hello,

how can i get the lastest version? I can only find a version www.ti.com/.../sboc401 that published on 2011 August.

hello,

can i get the source code of multi-cal-pga309? i want make some changes.

cause whenever the usb link is break i have to cal again from the beginning.it will cost much of time as change temperature and wait temperature stable.

and sometime the pga309 is caled, when EEPROM is faile, after replace i have to recal the pga309.since the data is already exist, would be better if can download the data into the new EEPROM.

Hello Daekeon,

I will send you a link to Box download the latest software and source code. 

Best,

Errol Leon

Texas Instruments

Precision Op Amp Applications

hello,Errol Leon6

Could you send me a link to download the lastest software and sourcecode? I want to customize the Multi-Cal PGA309.Add a few functions to make it more convenient.

Best regards,

Ma Tianxiang

Seana electric ltd.

Hello,

Here are the links to the latest versions. These links will expire after 7 days.

Source code: txn.box.com/.../rtlfoo28dr6o7ig47056gqgzm7gurz5k
Software: txn.box.com/.../mmsrw5dl5bcrrkqxcv6d5kz21f2lgwvq

Best regards,

Ian Williams
Applications Engineer - Precision Amplifiers

Hello, Ian.

I'm Daekeon Woo in Korea.

Is the same version this download link with multi-cal v2.3i that you sent me by E-mail on January this year?

Or some functions are changed??

Hello Mr. Woo,

The versions are the exact same as the ones from January - no functionality has been changed.

Best regards,

Ian Williams