Frequently Asked Questions isoPods
- 1 Where can I find a driver for my eDAQ hardware?
- 2 Do you happen to have any LabVIEW script for any of our USB-devices (EPU / ER815) which may be helpful to point a LabVIEW user in the right direction ?
- 3 How can I use the isoPod if I have separate ion selective and reference electrodes?
- 4 Some EPU452 Questions
Where can I find a driver for my eDAQ hardware?
The drivers are on the installation software thumb drives and CDs that are sent from eDAQ. When you install the software, the driver will be copied onto the computer.
Have a look at this troubleshooting application note.
Do you happen to have any LabVIEW script for any of our USB-devices (EPU / ER815) which may be helpful to point a LabVIEW user in the right direction ?
Basically any eDAQ product which supports our serial protocol such as the isoPods, HV sequencer, Waveform generator etc can be controlled by NI LabVIEW - and other software like C++. LabVIEW has facilities to access and communicate via a virtual serial port such as used by edaq devices.
File:LabVIEW isoPod.zip is a simple example of a LabVIEW Vi that was written as an example - ( it is not proven). eDAQ can provide advice and support on its serial protocol but eDAQ does not provide NI instruments in support of its devices.
How can I use the isoPod if I have separate ion selective and reference electrodes?
QUESTION: I just bought EPU353 isoPod for pH/ISE from eDAQ. How could I use this isoPod for ISE if I have separate ion selective electrode and reference electrode? The isoPod has only 1 BNC plug connection. Where could I connect the reference electrode? Or do I need to make my new ISE with the build-in reference electrode, similar to a conventional pH electrode probe?
The manual says “Half cell electrodes require the use of a separate reference electrode which can be connected to the shell of the input BNC connector.” This means you need a T-piece . You connect the measuring ISE to the inner pin of the BNC, and the reference electrode to the outer shell of the BNC.
Some EPU452 Questions
QUESTIONS: 1) If I use the EPU452 in the conductivity mode, how does it decide the amplitude and frequency of the applied sine wave for each range?
(2) If I use the EPU452 in the biosensor mode, what is the smallest stable voltage that I can apply? What is the step size of the voltage? Overall, how stable is the applied voltage?
(3) In the voltmeter mode, what is the accuracy and stability of the measurement?
ANSWERS: 1) The ER452 uses a proprietary waveform technique which adapts its frequency and amplitude to the conductivity being measured. Maximum amplitude 200mVpp.
2) Currently 1 mV was chosen as the smallest convenient increment of Poise voltage. The 16 Bit DAC that generates this voltage could produce increments of 0.1mV if required. The smallest voltage that can be applied is 0.0mV with an error of +/- 0.1mV typically 10uV. Stability is better than 10uV.
3) Voltmeter mode: Accuracy 0.1% +/- 1mV. Stability is >10uV