Products > Test Equipment
Video Teardown, Analysis and Repair of an Agilent E4407B ESA-E Spectrum Analyzer
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Shock:
Thanks for the video, I was cheering you on there in the middle when you faltered, but you came through in the end and nailed it, well done.

Often when we sleep on it things become clearer. I think you have got the gear and the knowledge to never back down from a challenge now.

Don't worry about the length of the videos you can always throw some quick ones in. There is no harm in making them episodic, as long as we don't have to wait.  :)

Hugoneus:

--- Quote from: electronic_eel on October 06, 2014, 05:03:07 pm ---
--- Quote from: Hugoneus on October 06, 2014, 02:34:02 pm ---Very high performance spectrum analyzers are actually DC coupled and can measure down to 3Hz.

--- End quote ---
But they usually have a big downside: you have to be very careful when measuring with such an instrument as the input stage will be destroyed if you input a dc signal.

--- End quote ---

Yes, these instrument have a big label at the input connector warning the user that only 0-VDC is allowed.
G0HZU:
If the 10dB (or more)  attenuator is selected I think the DC tolerance goes up to several volts but it isn't wise to chance this!

For my old 22GHz HP8566B I bought a high quality DC block (N type) that works from about 100kHz to 18GHz. It wasn't cheap but it does prevent damage from external DC.

At my place of work, the most common way that uW spectrum analysers get damaged is from external DC rather than from high RF power.

all_repair:
When the content is there, length is not a problem.  Each and every video of yours, no skip or fast forward when I was watching with full attention.
Hugoneus:

--- Quote from: G0HZU on October 06, 2014, 11:20:26 pm ---If the 10dB (or more)  attenuator is selected I think the DC tolerance goes up to several volts but it isn't wise to chance this!

For my old 22GHz HP8566B I bought a high quality DC block (N type) that works from about 100kHz to 18GHz. It wasn't cheap but it does prevent damage from external DC.

At my place of work, the most common way that uW spectrum analysers get damaged is from external DC rather than from high RF power.

--- End quote ---

Yes, this is indeed a problem in many places. While I was doing my Ph.D., another graduate student accidentally screwed an SMA into a V connector on a VNA. It was a thread-on-thread mess and the whole connector needed to be replaced. Another time, a student put 8V on the input of a 70GHz sub-sampling scope module, killing it instantly.
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