Switch between Multiple measuring Points

[AMLEB]

Hallo, 

I need some help concerning my application. I want to measure the resitance across a device however I want to measure more than one point so the I can switch between the measuring points through PC. The measrung device I have is a simple device with 2 wires. Which NI DAQ device will allow me to switch between Inputs using Labview. Can I do it using the USB-6009 ?

[ZYOng]

You can either:

1. Connect all 8 AIs of USB-6009 to all test points, then use DAQmx API to read from one AI at a time.
2. Use DIO of USB-6009 to control an external switch.

[AMLEB]

Hello , 

I attached an image which simplifies the application. I want to be able to switch using Labview program between measuring points (1 & 2 & 3 & 4). So that for example I want to measure first point 1 and then after 30s point 2 and after 30s point 3 and after 30s point 4.  Does it work with USB -6009? Or is there any other interface that can be used between the measuring wires of the measuring device and the wires of the measured points?

[ZYOng]

It depends on how many AIs you can use from USB-6009. If you can use all 4 DIFF AIs from USB-6009, you can read each AI for 30 seconds.

[AMLEB]

I actually have also some sensor data which I should import using the USB 6009 device. Do you have any other suggestion? 

[santo_13]

Folks can recommend a better approach if you can share all the information about your requirements clearly.

[crossrulz]

You could look at using a USB-6525, which has 8 solid-state relays on it that you could use to switch which spot you are measuring.

But I would also like more information on your application.  Seems like something simple like a Keysight DAQ970A with a DAQM900A mux would be a much better solution based on what little information you have given.

[AMLEB]

Thank you for your previous reply. I want to build a test bench. The aim of the test bench is to measure the resistance across electrical connectors after a certain number of connections in order to track the change of the resistance. For resistance measuring, I have a Four wire resistance measuring device called GOM 804. I can control this measuring device using Labview. I want to measure the resistance across the connector in more than one point. The measuring device allows me just to measure one point. My goal is to automate the whole measuring process without changing the measuring cables of the measuring device manually from one point to another after a certain number of connections. I have a straight robot arm where the electrical connector is fixed, and I can control it to do 100 connection cycles, for example. A position sensor is fixed on the robot arm. I want to acquire the data of the position sensor in labview so that for example after 100 connection cycles automatically I can get the value of the resistance on point 1 and then on point 2,etc… And after I get the resistance data, a 100 connection cycle will start again. What I till now achieved is to control the measuring device using labview and I can export measuring data to Excel sheet for one point. What I miss is an interface where I can acquire the signals from the sensor and build a counter for 100 connection cycles on labview and measure automatically the resistance on different points. This interface should allow me to switch between measuring points and should be controlled by labview.

[santo_13 · Accepted solution]

So, you need a multiplexer or switch matrix setup to connect your GOM-804 to different connector pins to measure its resistance over mating-cycles.

[AMLEB]

Thanks you for your suggested solution. Can you suggest for me an NI hardware for this application knowing that I want to measure a maximum of 4 different connector pins?