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cdev:
If someone says "for parts or best offer" and then you ask them if it powers up and they tell you it does, but then it doesn't power up when you get it, instead it blows a fuse.. who is right? What to do?

HighVoltage:

--- Quote from: cdev on December 09, 2018, 04:44:03 am ---If someone says "for parts or best offer" and then you ask them if it powers up and they tell you it does but they cant test it further but then it doesn't power up when you get it, instead it blows a fuse.. who is right? What to do?

--- End quote ---
Then you make a claim with the seller and tell him it is not as described and make arrangements for a lower price (partial refund) or return it for a full refund. Most sellers will agree to a partial refund in my experience.

nctnico:

--- Quote from: HighVoltage on December 09, 2018, 10:04:33 am ---
--- Quote from: cdev on December 09, 2018, 04:44:03 am ---If someone says "for parts or best offer" and then you ask them if it powers up and they tell you it does but they cant test it further but then it doesn't power up when you get it, instead it blows a fuse.. who is right? What to do?

--- End quote ---
Then you make a claim with the seller and tell him it is not as described and make arrangements for a lower price (partial refund) or return it for a full refund. Most sellers will agree to a partial refund in my experience.

--- End quote ---
Then you are lucky. 'For parts' means what it means. Unless the description says 'powers up' ofcourse. However 'powers up' doesn't always have to be a good thing. If it powers up then there is usually a more complicated error. A power supply is easy to fix.

rastro:

--- Quote from: Neomys Sapiens on December 09, 2018, 12:50:12 am ---
--- Quote from: rastro on December 08, 2018, 04:26:43 pm ---After fixing the cracked plastic clip that holds the sensor cartage wires to the PCB it zeroed and calibrated fine.  Yes you would need to have it re-characterized if you move or mess with the sensor cartage. 


You may also lean toward the 437 since you can store the calibration coefficients in a frequency lookup table - some added convenience.

--- End quote ---
What is the assumed meaning of 'cartage'?

--- End quote ---

Sorry for the spelling error.  I meant to say 'cartridge'.  The front end after the RF connector that holds the actual sensor/diode in the case of the HP 8484A. 

rastro

rastro:

--- Quote from: cncjerry on December 09, 2018, 04:05:47 am ---I thought the 'D' power sensor models were the diode type?  for instance 8481d, 8482d, etc.

Thanks for all the input.  This is all complicated but I'm starting to understand what I need.

--- End quote ---

The 8484A is diode sensor; so their is at least one 'A' model that is an exception to a "D" naming convention.  It's my understanding that thermocouple sensors don't have sensitivity to reliably measure below -30dBm.  So if the lowest range on the datasheet is significantly below -30dBm (e.g. -70dBm) it's probably a diode sensor.   However, to confuse the issue more, there are some HP sensors that use both both diode and thermocouple to get a much wider range.  I believe this is only on newer models (E-series) that have the correction coefficients stored internally in each sensor.  I don't think these sensors are backward compatible with the HP 436/7/8 power meters.

As a side note the 8484A and 8481D seem almost identical except that the 8481D is smaller.  Maybe some one knows what the differences are?  Again I've had pretty good luck on both models but as they say "your mileage may vary"....

rastro

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