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PXI-4110
Wunder
09-18-2008 09:29 PM
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Utilizing the PXI-4110 during calibration the current measurement mode either reads 0A or .9999xxxA value no matter what the resistive load is. It does not allow me to put in a voltage less than 13.25V on the input terminals with the auxilary power supply so I cannot use the voltages called out in Table 9 when I am applying different loads. The fuse is not blown. All other functions operate as spec'd. Any ideas as to waht the isuue may be?
Thanks
Corby_B
09-19-2008 04:53 PM
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Hello Wunder,
Thanks for your post!
I see that you are calibrating your 4110 and you are getting some railed current readings. You mention that It does not allow you to put in a voltage less than 13.25V on the input terminals of the aux power supply? The voltage of the AUX cable is 12 VDC at 5A so the voltage at the input of the AUX connection should not exceed that voltage. Where are you trying to input this 13.25 V? I don't know what would happen if a voltage larger than 12 V was sent into the aux connection of the 4110. If you use the NI-DC power soft front panel are you able to set the voltages according to Page 9 of the calibration manual for channels 0, 1 and 2? Do you see the 0A or .9999A on every channel? If you could let us know the answers to these questions that would be great!
Cheers!
Corby_B
http://www.ni.com/support
09-19-2008 07:29 PM
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We are applying an EXTernal power supply at the AUX Power Input on the front panel. The test equipment called for to perform the calibration is spec'd for 11V-15.5V, 5A. We are using a power supply capable of 120V @ 20A. All channels on the 1A range read either 0A or .9999xxA and 0mA or 20mA on the 20mA range. Using the soft front panel yeilded the same results. All I know is using ohms law with a 5 ohm load and 1.25V 1A or something close to that should not be the result. Whatever the resistive load is does not seem to affect the result.
The performance report shows for example:
As found/As left Test Value L limit Read High Limit Pass/Fail
.998248/.998248A 0.25A .99350A .9992A 1.00300A Pass
The program is applying 1.25V across a 5 ohm resistor Those numbers don't jive:) Hence the question
Cheers
Corby_B
09-22-2008 05:27 PM
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Hello Wunder,
Thanks for your post back and for the information!
I am sorry to hear that you are still seeing railed current values under any load. If you have a 10 Ohm resistor available could you do a test on channel 0 and then compare it to the test I ran using the soft front panel. Please see the picture attached. Do you have a DMM to actually measure the current that is being supplied by the Power Supply? As I am sure that it is obvious that you should not be seeing a railed current value like that. What version of NI-DCpower do you have on your system?
Cheers!
Corby_B
http://www.ni.com/support
09-23-2008 07:20 PM
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Corby:
We have the unit functioning correctly now using the front panel to manipulate everytning. The question now is the printed performance table. Exactly what is that telling me? As a calibration technicain who is trying to do a verification with QA I have to be able to explain why the performance table looks like it does. When you look at it it appears to have incorrect data as "pass" elements.
Thanks for your time
Corby_B
09-24-2008 05:42 PM
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Hello Wunder,
Thanks for your post back! I am glad to hear that things seem to be working correctly in your soft front panel. I was wondering what version of Calibration Executive you are using to calibrate your 4110? What DMM are you using as well? I have done a Performance test recently on a 4110 using an NI-PXI-4072 to calibrate. I feel like:
The performance report shows for example:
As found/As left Test Value L limit Read High Limit Pass/Fail
.998248/.998248A 0.25A .99350A .9992A 1.00300A Pass
the 0.25 A Test Value should not be what is read. In this situation the Test value should be 1.00A and then the results are yeilded. Take a look at the attached picture for the calibration test I ran on a PXI-4110. I know its a lengthy process but if you run the test again does it yield the same results now that your soft front panel is working correctly? I would like to recreate your exact situation here to see if the results are similar with the DMM you used. Thanks for the information Wunder!
Cheers!
Corby_B
http://www.ni.com/support
09-25-2008 03:49 PM
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Calibration Results
Current Measurement Accuracy (1A Range)
Calibration As Found As LeftChannel As FoundDMM ReadingAs Left DMM
ReadingTest Value Low Limit Reading High Limit PassFail Low Limit Reading High Limit PassFail
0 0.000000 A 0.000000 A 0.00000 A -0.00400 A 0.00007 A 0.00400 A Passed -0.00200 A 0.00007 A 0.00200 A Passed
0 0.998475 A 0.998475 A 0.25000 A 0.99410 A 0.99916 A 1.00285 A Passed 0.99642 A 0.99916 A 1.00052 A Passed
0 0.998338 A 0.998338 A 0.50000 A 0.99359 A 0.99931 A 1.00309 A Passed 0.99584 A 0.99931 A 1.00084 A Passed
0 0.998137 A 0.998137 A 0.75000 A 0.99207 A 0.99901 A 1.00420 A Passed 0.99414 A 0.99901 A 1.00214 A Passed
0 0.998037 A 0.998037 A 1.00000 A 0.99004 A 0.99902 A 1.00604 A Passed 0.99254 A 0.99902 A 1.00354 A Passed
1 0.000000 A 0.000000 A 0.00000 A -0.00400 A 0.00103 A 0.00400 A Passed -0.00200 A 0.00103 A 0.00200 A Passed
1 0.999017 A 0.999017 A 0.25000 A 0.99464 A 0.99932 A 1.00339 A Passed 0.99697 A 0.99932 A 1.00107 A Passed
1 0.998954 A 0.998954 A 0.50000 A 0.99420 A 0.99933 A 1.00370 A Passed 0.99645 A 0.99933 A 1.00145 A Passed
1 0.998905 A 0.998905 A 0.75000 A 0.99284 A 0.99936 A 1.00497 A Passed 0.99490 A 0.99936 A 1.00290 A Passed
1 0.998900 A 0.998900 A 1.00000 A 0.99090 A 0.99939 A 1.00690 A Passed 0.99340 A 0.99939 A 1.00440 A Passed
2 0.000000 A 0.000000 A 0.00000 A -0.00400 A 0.00019 A 0.00400 A Passed -0.00200 A 0.00019 A 0.00200 A Passed
2 0.999510 A 0.999510 A 0.25000 A 0.99513 A 0.99870 A 1.00388 A Passed 0.99746 A 0.99870 A 1.00156 A Passed
2 0.999214 A 0.999214 A 0.50000 A 0.99446 A 0.99873 A 1.00396 A Passed 0.99671 A 0.99873 A 1.00171 A Passed
2 0.998840 A 0.998840 A 0.75000 A 0.99278 A 0.99878 A 1.00490 A Passed 0.99484 A 0.99878 A 1.00284 A Passed
2 0.998798 A 0.998798 A 1.00000 A 0.99080 A 0.99879 A 1.00680 A Passed 0.99330 A 0.99879 A 1.00430 A Passed
PXI-4110 Serial Number: E6925E
Monday, September 22, 2008 19:57:34 Page 2 of 7
09-25-2008 03:49 PM
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Calibration Results
Current Measurement Accuracy (1A Range)
Calibration As Found As LeftChannel As FoundDMM ReadingAs Left DMM
ReadingTest Value Low Limit Reading High Limit PassFail Low Limit Reading High Limit PassFail
0 0.000000 A 0.000000 A 0.00000 A -0.00400 A 0.00007 A 0.00400 A Passed -0.00200 A 0.00007 A 0.00200 A Passed
0 0.998475 A 0.998475 A 0.25000 A 0.99410 A 0.99916 A 1.00285 A Passed 0.99642 A 0.99916 A 1.00052 A Passed
0 0.998338 A 0.998338 A 0.50000 A 0.99359 A 0.99931 A 1.00309 A Passed 0.99584 A 0.99931 A 1.00084 A Passed
0 0.998137 A 0.998137 A 0.75000 A 0.99207 A 0.99901 A 1.00420 A Passed 0.99414 A 0.99901 A 1.00214 A Passed
0 0.998037 A 0.998037 A 1.00000 A 0.99004 A 0.99902 A 1.00604 A Passed 0.99254 A 0.99902 A 1.00354 A Passed
1 0.000000 A 0.000000 A 0.00000 A -0.00400 A 0.00103 A 0.00400 A Passed -0.00200 A 0.00103 A 0.00200 A Passed
1 0.999017 A 0.999017 A 0.25000 A 0.99464 A 0.99932 A 1.00339 A Passed 0.99697 A 0.99932 A 1.00107 A Passed
1 0.998954 A 0.998954 A 0.50000 A 0.99420 A 0.99933 A 1.00370 A Passed 0.99645 A 0.99933 A 1.00145 A Passed
1 0.998905 A 0.998905 A 0.75000 A 0.99284 A 0.99936 A 1.00497 A Passed 0.99490 A 0.99936 A 1.00290 A Passed
1 0.998900 A 0.998900 A 1.00000 A 0.99090 A 0.99939 A 1.00690 A Passed 0.99340 A 0.99939 A 1.00440 A Passed
2 0.000000 A 0.000000 A 0.00000 A -0.00400 A 0.00019 A 0.00400 A Passed -0.00200 A 0.00019 A 0.00200 A Passed
2 0.999510 A 0.999510 A 0.25000 A 0.99513 A 0.99870 A 1.00388 A Passed 0.99746 A 0.99870 A 1.00156 A Passed
2 0.999214 A 0.999214 A 0.50000 A 0.99446 A 0.99873 A 1.00396 A Passed 0.99671 A 0.99873 A 1.00171 A Passed
2 0.998840 A 0.998840 A 0.75000 A 0.99278 A 0.99878 A 1.00490 A Passed 0.99484 A 0.99878 A 1.00284 A Passed
2 0.998798 A 0.998798 A 1.00000 A 0.99080 A 0.99879 A 1.00680 A Passed 0.99330 A 0.99879 A 1.00430 A Passed
PXI-4110 Serial Number: E6925E
Monday, September 22, 2008 19:57:34 Page 2 of 7
Corby_B
09-25-2008 04:01 PM - edited 09-25-2008 04:02 PM
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Hello Wunder,
Thanks for your post back!
I see now what you mean by incorrect data. What DMM are you using to calibrate your 4110? I want and see if I can reproduce what you are seeing here. Thanks for taking the time to post Wunder and I hope to find a answer for you soon.
Cheers!
Corby_B
09-25-2008 04:11 PM
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Calibration Results
Current Measurement Accuracy (1A Range)
Calibration As Found As Left
Channel As FoundDMM Reading As Left DMM Reading Test Value Low Limit Reading High Limit PassFail Low Limit Reading High Limit PassFail
0 0.000000 A 0.000000 A 0.00000 A -0.00400 A 0.00007 A 0.00400 A Passed -0.00200 A 0.00007 A 0.00200 A Passed
0 0.998475 A 0.998475 A 0.25000 A 0.99410 A 0.99916 A 1.00285 A Passed 0.99642 A 0.99916 A 1.00052 A Passed
0 0.998338 A 0.998338 A 0.50000 A 0.99350 A 0.99922A 1.00309 A Passed 0.99584 A 0.99931 A 1.00084 A Passed
0 0.998137 A 0.998137 A 0.75000 A 0.99207 A 0.99901 A 1.00420 A Passed 0.99414 A 0.99901 A 1.00214 Passed
0 0.998037 A 0.998037 A 1.00000 A 0.99004 A 0.99902 A 1.00604 A Passed 0.99254 A 0.99902 A 1.00354 Passed
1 0.000000 A 0.000000 A 0.00000 A -0.00400 A 0.00103 A 0.00400 A Passed -0.00200 A 0.00103 A 0.00200 Passed
1 0.999017 A 0.999017 A 0.25000 A 0.99464 A 0.99932 A 1.00339 A Passed 0.99697 A 0.99932 A 1.00107 Passed
1 0.998954 A 0.998954 A 0.50000 A 0.99420 A 0.99933 A 1.00370 A Passed 0.99645 A 0.99933 A 1.00145 Passed
1 0.998905 A 0.998905 A 0.75000 A 0.99284 A 0.99936 A 1.00497 A Passed 0.99490 A 0.99936 A 1.00290 Passed
1 0.998900 A 0.998900 A 1.00000 A 0.99090 A 0.99939 A 1.00690 A Passed 0.99340 A 0.99939 A 1.00440 Passed
PXI-4110 Serial Number: E6925E
Monday, September 22, 2008 19:57:34 Page 2 of 7
I have attached our results calibrating the PXI-4110 using Cal Exec 3.2.2 and a PXI-4071 DMM. We are using an auxilary power supply and the 240C Clarostat to apply our loads. Unit doesn't look good on the report even though it says passed, but functions correctly from the front panels. So any suggestions as to what is up?
Cheers
