I Can't Get Current Reading with Probes of myDAQ

[Glnd]

I purchased a myDAQ a few weeks ago for an online course I'm taking. Using DMM tool in Elvis I've never been able to measure current through the Digital Multimeter. I can measure voltage but when I switch the position of the red lead to the A position and try to measure current I get all zeros. Nothing. I have the DMM setting to Specific range and set to 20mA. My circuit consists of a single 9V battery and a 2.2kohm resistor. I can't get any simpler than that.

[Dennis_Knutson]

To get simple, is the meter in series with the circuit?

[crossrulz]

Electrical Engineering 101.  Voltage is measured in parallel of the circuit.  Current is measured in series of the circuit.

[Glnd]

   No I had it in series. I actually Skyped with an assistant to my Professor and he watch me build the circuit and made sure everything was setup correctly and I still got no value at all on the ELVIS DMM.

   It appears from the logic diagram on the top of the myDAQ that the DMM may be a separate circuit that feeds inputs into a controller. I'm think that there is something wrong with the A port of my myDAQ that is not allowing the signal to go through. Like I said I have no trouble reading voltage

[Glnd]

Sorry but I DID describe my issue. My issue is this: when using the myDAQ red and black probes to read current I get no current reading. Yes I have placed the probes in series with the one 9V battery and one 2.2k ohm resistor. No reading. It's the simplest circuit I could make to test my equipment. I even had an assistant to my Professor watch me build the circuit on Skype to verify I was had everything setup right and using the probe correctly. Is there an internal fuse that could have been blown if I hooked it up incorrectly?? Something I can replace?

[Glnd]

  The "A" port of my myDAQ says"1 A MAX". Does that mean that inside there is a 1A fuse protecting that circuit? If so can I open the back up and replace it? What kind of warranty (if any) comes with my myDAQ and would it be void if I open up the back to replace it the fuse? I assume that because the my DAQ is used by students for learning purposes that the fuses would be replaceable and NOT board mounted for obvious reasons.

   Let me know! Thanks!

[Aaron_W.]

Glnd,

Here are a couple of things that will help you out.

1) There is a video demonstration on how to check to see if the fuse is good on your device.

https://decibel.ni.com/content/docs/DOC-12879

2) If you look at the Safety and User Guide for myDAQ then you will find the instructions on removing the fuse. (Bottom of Page 2)

www.ni.com/pdf/manuals/375745.pdf#page=2

Hope this helps.

[Glnd]

THANK YOU!  I ran the test to check the internal fuse and it indicates that indeed the fuse is blown! I will buy one and replace it today!