analog output is 0 on 6024E

[PlGM]

Hi,

I got a problem about the analog output from my 6024E connected with SCB-68, which is:

1) The measurement (voltage) between AOGND and DAC0 OUT (or DAC1 OUT) is always 0 now, however, it was right. (I did not change anything.)

2) The measurement (voltage) between AIGND (or DGND) and DAC0 OUT (or DAC1
OUT)
is right now.

3) The measurement (voltage) between AOGND and +5V (Pin 14 or Pin 8 on
6024E)
is always 0 now, however, which is right to DGND.

So, it seems something wrong about AOGND.

Please help me.

Thanks.

[Sean_C.]

Hello,

Open a test panel for your 6024E in Measurement and Automation Explorer and output a value of 4 Volts on either of your AO channels.  Can you measure 4 Volts between the AO channel and AO GND?  If not, then I suspect that your board might need to be repaired.  If this is the case, please call 1-866-ASK-MYNI to set up the repair order.

I hope this helps.  Please let me know if you have any further questions.

Regards,
Sean C.

[PlGM]

I did. ( I did it before I posted this message, and did it again.)

And I executed the E Series self test and passed. (using NI's website).

The issue is, like I mentioned, the output voltage between AO channels and AO GND is always 0, however, the output is what I want when refering to AI GND or DGND.

So, what do you think?

Thanks.

[Sean_C.]

Hello,

It sounds like your board is damaged.  Please call 1-866-ASK-MYNI to set up your repair order.

Regards,
Sean C.

[PlGM]

Hi,

Thank you very much anyway.

However, I am using the AIGND instead of AO GND, then everything is OK now.

So, can I use it? (according to NI's SPC, the AOGND, AIGND, DGND are connected internally).

Or it there anything dangerous to use AIGND for the analog output?

Thanks again.

[Sean_C.]

Hello,

If you are satisfied with using AIGND as a reference for your AO channels, then you do not need to repair this device.  This should not cause any damage to your board.

Regards,
Sean C.

[AnalogKid2DigitalMan]

Could it be a bad ribbon cable or broken connection between the DAQ card and the terminal on the SCB68? You may want to recheck integrity of all connection points. Also, all used screws onthe SCB68 tight?

[PlGM]

Hi,

Thank you very much.

And you are right. I am using the 6024E with SCB 68 Connector Block to control the power supply XFR 20-60, and it worked well. However, one day, it did not work anymore after the OVP (over voltage protection) LED lighted once on the XFR and the behavior was like above.

My first thought was some component on the 6024E may be burnt out, but the analog output channel0/1 still have correct voltage referring to AIGND/DGND, and all of input and DIO are OK. So, never thought about connection.

Today, after checking the pinout of 6024E suggested by you. I found everything is OK on the pinout, so that there must be something wrong on the SCB 68 block, which is, in fact, the AO GND thread on the PCB was burnt out.

Thanks again.

BTW, your poetry about the "wheels" is very beautiful. 

[AnalogKid2DigitalMan]

PIGM:

You are welcome, glad I could help assist in troubleshooting

The wheels poem is actually a piece from the song Natural Science by the band Rush