[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?
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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