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hp 8591 CATV analyzer
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on Nov 24, 2009
on Dec 3, 2009 by MikeM
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I have hp 8591C witch suddenly lost CATV Analyzer option - it doesn't show up after I hit PRESET button. Please let me know how to restore this function. I'm assuming it is a problem with soft. Thanks!
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Aug 21, 2014 6:44 PM
All of the CATV measurements under the Mode key, or when Preset, are from a downloadable program, which is model number 85721A for the 8591Cs. This can standard with all 8591Cs and was loaded into the instruments at the factory. If these are all missing the instrument must have had some sort of a memory issue and deleted them all, or it may be that the memory backup battery has gone dead.
Sometimes when this happens the instrument will also forget things like it being a 75ohm instrument, or that the amplitude units should be dBmV. When you turn the instrument on what are the amplitude units? Also, there should be a sticker on the rear panel with a date that the battery was installed, what does it say? Did the instrument also lose the time and date?
You may need to change the battery before trying to reload the CATV measurements, otherwise they may not last...
To reload the program, all 8591C instruments were also shipped with an 85721C DLP card that can be inserted into the front panel card reader so that it can be reinstalled. Hopefully you still have this card so that you can reload it...
The User's Guide has information on how you can reload this in Chapter 1. The NTSC version of this manual can be found at:
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