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Thread: Operator's check on PNA


Permlink Replies: 2 - Pages: 1 - Last Post: Nov 8, 2011 7:21 PM Last Post By: cmwong
cmwong

Posts: 32
Registered: 06/28/09
Operator's check on PNA
Posted: Sep 12, 2011 12:41 AM
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Hi, I have recently done an Operator's check on my PNA and found out that the Receiver A value is 11.29 dB while Receiver B value is 3.52 dB. Is there a problem with my PNA, it seems that the noise floor is quite high. How will this affect my measurements?

What can I do to resolve it? Deos it need fixing?

Attached is a report of the Operator's Check.

Any inputs is deeply appreciated. Thank you in advance.

regards,
cmwong
jvall

Posts: 491
Registered: 12/08/05
Re: Operator's check on PNA
Posted: Sep 12, 2011 11:45 AM   in response to: cmwong in response to: cmwong
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The first question I always have to ask regarding OpCheck is: Was there a Short or Open Standard attached to each port?
Leaving the port completely open is not valid. The unterminated connector will radiate and will produce poor reflection at some higher frequencies...and we depend upon a full reflection to make any decent measurement.

If you did have an open/short connected, can you try a different one....just to make sure it is not a defective open/short (and yes I have seen several of these.)
And I assume the open/short was connected directly to the port...no intervening cable used.
Are the ports and/or standards clean?
Let me know.

JV
cmwong

Posts: 32
Registered: 06/28/09
Re: Operator's check on PNA
Posted: Nov 8, 2011 7:21 PM   in response to: cmwong in response to: cmwong
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Hi,

Apologise for the late reply. Ya I have forgotten to attach the Open standard to the PNA while performing the Operator's check. Thanks for the reminder!

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