Author Topic: HP 34401A, Error 602  (Read 1138 times)

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Offline diewindowsdie

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HP 34401A, Error 602
« on: October 22, 2015, 05:26:16 am »
Hi guys!

Received my HP 34401A from ebay seller today. Full self-test reports error 602, which is RAM read/write error. I have also checked main functions - DC voltage/current, AC voltage, continuity test, frequency, resistance - and everything seems to work fine (except for out of calibration maybe, can't check that). So my question is - why a multimeter actually needs a RAM? It is only for programming-related stuff? What is the consequences on leaving it as-is in terms of being able to perform basic measurements?


Offline bitseeker

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Re: HP 34401A, Error 602
« Reply #1 on: October 22, 2015, 09:48:22 am »
The logging function likely uses the RAM. Also, any temporary settings would go into RAM. The calibration values would be stored in non-volatile memory, so no worries there.

For basic measurements, you're probably fine. I'm not sure about the math functions, though. Give them a try.
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Offline free_electron

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Re: HP 34401A, Error 602
« Reply #2 on: October 22, 2015, 12:13:46 pm »
the 34401 has like half a megabyte of ram. you have to remeber there are 3 CPU's in that thing ... plus 3 asics plus 2 flash roms plus an eeprom ...
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