AshParticipantAsh March 15, 2016 at 1:49 am
I am using SA124B spectrum analyzer for power measurement of a specific frequency in my project. Initially it was doing wonderful job and providing accurate reading. However, now i am facing issue of inaccurate power measurement by my device. A signal of -15 dBm at 6 GHz freq is being measured by my device as -70 dBm/6GHz. I have checked it with the latest version of spike (3.22), problem still persists. second thing which i observed is the value of amplitude is dependent on the ref offset level. for example with 0 dB offset amplitude is -70 and with 50 dB offset amplituse is -20dBm. Is there anything i am missing?
Dr DomParticipantDr Dom March 15, 2016 at 1:58 am
Sounds like a problem I just had, which I think is down to the input connector centre pin. I applied a bit of sideways pressure and the signal shot off. Sent it off to my local retailer for repair last week and waiting for some feedback.
AshParticipantAsh March 15, 2016 at 8:34 am
Thanx Dr Dom,but i dnt think so there is any issue with connector … as i dnt remember any such incedent which would have damaged the connector. How to check it actually?
Justin CrooksModeratorJustin Crooks March 15, 2016 at 9:01 am
It sounds like we may need to look at your SA124B. If you have the equipment, generate a CW signal at 25 MHz, 1 Ghz, 3 GHz, 6 GHz, and 10 GHz, around -10 dBm with a 0 dBm reference level and 100 kHz span. If any of them read more than a few dB off, we will need to repair your SA124B. Email support @ signalhound.com for details.
Dr DomParticipantDr Dom March 18, 2016 at 5:57 am
I tested my unit in a similar way to what Justin has described, I used a swept source and put the SA124B on max hold and let it build up a picture. If it is cracked/open circuit input pin you will see an increasing signal level with frequency. Foltronics in Holland did a great job quickly fixing my unit and it is already back with me – thanks guys! 🙂
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