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N5182A I/Q differential output ...

Question asked by debugasm on Sep 30, 2013
Latest reply on Oct 4, 2013 by debugasm

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Hi,

I have one Agilent N5182A with option "1EL" Differential I/Q output. Until now I have never used these outputs because I did not need, but today I noticed that they have some problems, but I'm not sure.

The signal on BNC output Ip and Qp are within specifications, but signal on BNC In and Qn are not.

I connected the 4 outputs Ip / In / Qp / Qn on oscilloscope and the relationship between Ip and In is 10:1 (Ip = 1Vpp / In = 100mVpp). The phase of p/n is ok (180° offset) but the amplitude is not the same.

Is a hardware problem ? It broke something ? Or should it be so ?

I have made Full Internal test and Generator report all ok.

What can I check ?

What do you recommend ?

Trace 1 = I positive signal
Trace 2 = I negative signal

!http://postimg.org/image/v435egi8h/!

Trace 1 = Q positive signal
Trace 2 = Q negative signal

!http://postimg.org/image/uxmbox19d/!

Thanks very much

debugasm

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1-Ip 2-In.png26.3 KB
1-Qp 2-Qn.png25.3 KB

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tabbott

Oct 1, 2013 1:38 PM

Hi debugasm -

I recently had a customer who had option 1EL and they weren’t getting anything out of the I not and Q not.

A good way to check this it to load up the SINE_TEST_WFM waveform into the Dual Arb and play it.

You should see a sine wave with an amplitude of 800 mVpp on all four ports, I, Q, I not, and Q not.

The customer that wasn’t getting the correct output on the I not and Q not needed to upgrade their firmware to 1.86.

If you have old firmware, I suggest you upgrade and then look at the outputs.

Regards -

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debugasm @ tabbott on Oct 4, 2013 12:36 AM

Hi tabbott,

> I recently had a customer who had option 1EL and they weren’t getting anything out of the I not and Q not.

My generator has the latest firmware installed and also the license 1EL.

> A good way to check this it to load up the SINE_TEST_WFM waveform into the Dual Arb and play it.

I did as you said, the signals Ip and Qp are perfect but the signals In and Qn are 1/10 lower as if someone attenuate this.

I'll do a few more tests, the generator is out of warranty and not working, but no fault of mine.

Thanks very much.

Gabriele

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debugasm @ tabbott on Oct 4, 2013 12:49 AM

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debugasm @ tabbott on Oct 4, 2013 12:51 AM

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debugasm @ tabbott on Oct 4, 2013 2:14 AM

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debugasm @ tabbott on Oct 4, 2013 8:13 AM

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6 Replies

tabbott Oct 1, 2013 1:38 PM
Mark Correct
Correct Answer
Hi debugasm -

I recently had a customer who had option 1EL and they weren’t getting anything out of the I not and Q not.

A good way to check this it to load up the SINE_TEST_WFM waveform into the Dual Arb and play it.

You should see a sine wave with an amplitude of 800 mVpp on all four ports, I, Q, I not, and Q not.

The customer that wasn’t getting the correct output on the I not and Q not needed to upgrade their firmware to 1.86.

If you have old firmware, I suggest you upgrade and then look at the outputs.

Regards -
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- debugasm @ tabbott on Oct 4, 2013 12:36 AM
  Mark Correct
  Correct Answer
  Hi tabbott,
  
  > I recently had a customer who had option 1EL and they weren’t getting anything out of the I not and Q not.
  
  My generator has the latest firmware installed and also the license 1EL.
  
  > A good way to check this it to load up the SINE_TEST_WFM waveform into the Dual Arb and play it.
  
  I did as you said, the signals Ip and Qp are perfect but the signals In and Qn are 1/10 lower as if someone attenuate this.
  
  I'll do a few more tests, the generator is out of warranty and not working, but no fault of mine.
  
  Thanks very much.
  
  Gabriele
  Like • Show 0 Likes0
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- debugasm @ tabbott on Oct 4, 2013 12:49 AM
  Mark Correct
  Correct Answer
  Hi tabbott,
  
  > I recently had a customer who had option 1EL and they weren’t getting anything out of the I not and Q not.
  
  My generator has the latest firmware installed and also the license 1EL.
  
  > A good way to check this it to load up the SINE_TEST_WFM waveform into the Dual Arb and play it.
  
  I did as you said, the signals Ip and Qp are perfect but the signals In and Qn are 1/10 lower as if someone attenuate this.
  
  I'll do a few more tests, the generator is out of warranty and not working, but no fault of mine.
  
  Thanks very much.
  
  Gabriele
  Like • Show 0 Likes0
  Actions
- debugasm @ tabbott on Oct 4, 2013 12:51 AM
  Mark Correct
  Correct Answer
  Hi tabbott,
  
  > I recently had a customer who had option 1EL and they weren’t getting anything out of the I not and Q not.
  
  My generator has the latest firmware installed and also the license 1EL.
  
  > A good way to check this it to load up the SINE_TEST_WFM waveform into the Dual Arb and play it.
  
  I did as you said, the signals Ip and Qp are perfect but the signals In and Qn are 1/10 lower as if someone attenuate this.
  
  I'll do a few more tests, the generator is out of warranty and not working, but no fault of mine.
  
  Thanks very much.
  
  Gabriele
  Like • Show 0 Likes0
  Actions
- debugasm @ tabbott on Oct 4, 2013 2:14 AM
  Mark Correct
  Correct Answer
  Hi tabbott,
  
  > I recently had a customer who had option 1EL and they weren’t getting anything out of the I not and Q not.
  
  My generator has the latest firmware installed and also the license 1EL.
  
  > A good way to check this it to load up the SINE_TEST_WFM waveform into the Dual Arb and play it.
  
  I did as you said, the signals Ip and Qp are perfect but the signals In and Qn are 1/10 lower as if someone attenuate this.
  
  I'll do a few more tests, the generator is out of warranty and not working, but no fault of mine.
  
  Thanks very much.
  
  debugasm
  Like • Show 0 Likes0
  Actions
- debugasm @ tabbott on Oct 4, 2013 8:13 AM
  Mark Correct
  Correct Answer
  Hi tabbott,
  
  > I recently had a customer who had option 1EL and they weren’t getting anything out of the I not and Q not.
  
  My generator has the latest firmware installed and also the license 1EL.
  
  > A good way to check this it to load up the SINE_TEST_WFM waveform into the Dual Arb and play it.
  
  I did as you said, the signals Ip and Qp are perfect but the signals In and Qn are 1/10 lower as if someone attenuate this.
  
  I'll do a few more tests, the generator is out of warranty and not working, but no fault of mine.
  
  Thanks very much.
  
  debugasm
  Like • Show 0 Likes0
  Actions

N5182A I/Q differential output ...

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