conducting electrochemistry for corrosion testing , HOW??

[najat from bahrain]

I am a lecturer teaching and conducting research as a part of PhD degree on Electrochemistry measurement for corrosion potentiol and current measurement. Briefly, to measure corrosion we connect an anode (which will be sacrified) and a cathode ( that to be protected) of different materials then a continuous monitoring of both cureent and potential to be meassured in order to control corrosion. I have a digital multimeter and EG&G E-logi device.... I have not used labVIEW before in corrosion experiments, please guide and assisst .. i may attend an online course to enhance my understanding...Thanks

[Emilie S.]

Hi najat:

How are you connected from this instrument to the computer? Are you using GPIB, serial...? What version of LabVIEW do you have?

Thank you,

Emilie S.
Applications Engineer
National Instruments

[najat from bahrain]

Hello Emilie;
It was nice of you to reply. I am using labVIEW 6.1. what do you mean by serial and GPIB?? So far i have EG&G (E-logi) measuring device- but it is quite ols (10yrs back), i am not sure about its working system- i tried to contact the company but i had no reply . Please, advice if you know how to start the experimental setup and all the required parts...thanks again

[Emilie S.]

Hi najat:

Is there a model number on your instrument? Do you know how it communicates to the computer? As in, is it connected to your serial port? Do you have the manual for the instrument? If not, do you know the commands you need to send the instrument? It will be hard to continue on without this information, however, if you want to a basic example program to show you how this works, you can find an example called Serial Communication in NI Example Finder. The NI Example Finder can be accessed by going to Help->Find Examples.

Emilie S.
Applications Engineer
National Instruments

[najat from bahrain]

Hi Emilie;
Yes i do have catalogue for the instruments that i am going to use...let me go back to office tomorrow and read the manuuals or i may refer to you for the details you had requested... please be patient with me , i may ask selly questions to an expert person like you..

[Emilie S.]

Hi najat:

Don't worry about it at all. Just post here when you get some more information and we can work through it.

Emilie S.
Applications Engineer
National Instruments

[najat from bahrain]

Hello Emilie;
The informations below are just copied from operating instrument manuuals;

1- Potentiostat/Galvanostat (model 273):
- electrochemical instrumentaion
- allow 100V and 1A output
- interfaced to computer both GPIB and RS232C ports provided
- allow cyclic staircase voltammetry
- internal storage and arithmatic data manipulation
- equipped with;
* 14-bit digital-to-analog convertors for versatile waveform generation
* 12-bit analog-to-digital convertor to measure current and potential
* An on-board microprocessor to perform the experiment defined by the command set.
* on-board memory to store the programmed parameters and data point values.


2-HAMEG system Multimeter HM8112
- True RMS measurement capability (DC-couples)
- 10 meausrements per seconds;programmable measuring time
- IEEE-488-Bus standard - Built self test function
- High input resistance: 1Gohm (0.2V and 2V range)
- Electronic calibration via keyboard or via IEEE-488-Bus

[Emilie S.]

Hi najat:

I'm still not familiar with these instruments, but you should still be able to communicate with them through VISA. I am going to assume that for the first instrument you are connected to the computer using an RS232 cable to a serial port. If so, in LabVIEW please go to Help-Find Examples and search for serial. This should bring up three good serial communication examples. Also, I have included a very basic VISA serial example that I wrote for you to look at. In addition to LabVIEW you need NI-VISA to run these programs. NI-VISA should have been included in the device drivers CD that ships with LabVIEW.

Based upon your description of the second instrument it sounds to me like you must use GPIB for communication. If so you would need a GPIB board and a GPIB cable, but ultimately you could still use VISA for the programming so it will be very similar to the serial communication.

For both of these you will have to know the specific commands for your instrument which should be found in the manuals.

Regards,

Emilie S.
Applications Engineer
National Instruments