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Question asked by DoctorT on Apr 6, 2010
Latest reply on Apr 7, 2010 by DoctorT

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Apologies for the stupid question, but...

I am using an 8753ES with an 85046A S Parameter Test Set. After calibration using Full 2-Port, and using a 50 ohm coaxial air line as a DUT, the instrument is reading out S Parameters with units such as 850 mV for S21. I don't understand the units; shouldn't these parameters be dimensionless? I would have expected to see the values expressed as some percentage of the generator power. What am I missing? The calculated Transmission coefficient is larger than unity, which suggests I am missing normalization somewhere.

Again, apologies for the stupid question, but I'm not finding any answers in the manual or searching this forum.

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Dr_joel

Apr 7, 2010 7:29 AM

A bit odd. Is it an 8753ES option 011? that's the option that deletes the test set, otherwise you should not need a test set.

What's your format? Put it in LogMag and the values will be in dB, which is a relative measurement. To my knowledge, the units cannot be mV in the '53. is it really saying mU (as in milli-units?). This is the linear value where a unit is dimensionless (just like dB).

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DoctorT Apr 7, 2010 1:53 PM

"
A bit odd. Is it an 8753ES option 011? that's the option that deletes the test set, otherwise you should not need a test set.

What's your format? Put it in LogMag and the values will be in dB, which is a relative measurement. To my knowledge, the units cannot be mV in the '53. is it really saying mU (as in milli-units?). This is the linear value where a unit is dimensionless (just like dB).
"

Yes, we do have an Opt 011 instrument.

Yes, closer reading of the display indicates that the units may be milli-units; and that would make a lot of sense. In fact, I believe it answers my question, thank you very much.

I had just never heard of the SI designation for "Dimensionless Units," but appreciate the learning. Thanks very much for the reply!

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Dr_joel Apr 7, 2010 7:29 AM
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A bit odd. Is it an 8753ES option 011? that's the option that deletes the test set, otherwise you should not need a test set.

What's your format? Put it in LogMag and the values will be in dB, which is a relative measurement. To my knowledge, the units cannot be mV in the '53. is it really saying mU (as in milli-units?). This is the linear value where a unit is dimensionless (just like dB).
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DoctorT Apr 7, 2010 1:53 PM
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Correct Answer
"
A bit odd. Is it an 8753ES option 011? that's the option that deletes the test set, otherwise you should not need a test set.

What's your format? Put it in LogMag and the values will be in dB, which is a relative measurement. To my knowledge, the units cannot be mV in the '53. is it really saying mU (as in milli-units?). This is the linear value where a unit is dimensionless (just like dB).
"

Yes, we do have an Opt 011 instrument.

Yes, closer reading of the display indicates that the units may be milli-units; and that would make a lot of sense. In fact, I believe it answers my question, thank you very much.

I had just never heard of the SI designation for "Dimensionless Units," but appreciate the learning. Thanks very much for the reply!
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