[volt-nuts] 3458A - calibration constants coding

David C. Partridge david.partridge at perdrix.co.uk
Sat Nov 5 11:11:38 UTC 2011

Just a thought, are you interpreting this with the appropriate "endian-ness" for the processor? 

David Partridge
-----Original Message-----
From: volt-nuts-bounces at febo.com [mailto:volt-nuts-bounces at febo.com] On Behalf Of Frank Stellmach
Sent: 05 November 2011 10:28
To: volt-nuts at febo.com
Subject: [volt-nuts] 3458A - calibration constants coding


One can easily see from the first 5 bytes of each DReal number, that the first bit of each Byte of the DReal number read by MEMREAD is inverted. 
The last three bytes deviate by rounding to 9 decimal places.

So I assume, that HP'encrypted' the constants, either directly in the RAM, or during readout by MEMREAD.



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