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Author Topic: HP 856XE Center Frequency Drift  (Read 1313 times)

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Offline Electro FanTopic starter

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HP 856XE Center Frequency Drift
« on: July 03, 2015, 02:10:50 am »
Anyone have an idea about what might cause a HP SA center frequency to drift downward about 10MHz in a couple minutes after being set to a center frequency around 2.5Ghz?  (After the first couple minutes the rate of drift slows but continues downward.) And how to fix it?  Thanks
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Offline Electro FanTopic starter

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Re: HP 856XE Center Frequency Drift
« Reply #1 on: July 03, 2015, 02:48:42 am »
Update:  the center frequency drifts when the SA's input is an antenna designed for Wifi frequencies; when the input is a cable to a signal generator the center frequency remains precisely stable at the set center frequency.   ???
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Offline Electro FanTopic starter

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Re: HP 856XE Center Frequency Drift
« Reply #2 on: July 03, 2015, 04:05:19 am »
Further Update:  after some dial twiddling the whole thing seems to have settled down and no drift occurs with the antenna on the input.  Not sure what happened but it's good now....
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