Re: GPIB board for calibrating AM503B, or alternatives?


 

Hi Rico,
I think screen shots would be great. A picture is worth 1K words.
Dennis

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of Rico Sonderegger
Sent: Monday, May 10, 2021 4:01 AM
To: TekScopes@groups.io
Subject: Re: [TekScopes] GPIB board for calibrating AM503B, or alternatives?

Hello Dennis,

With the AM503B, without a GPIB interface, no write processes (except for everything that concerns the operation of the device) can be triggered on the SRAM (PCF8570).
I started by recording the data when "booting" the device and then looking for the value "25000".
This is the "default" value for the calibration data. This is how I found the addresses for these values.
The serial number is in a different area of the SRAM.
In addition, each time a button is pressed on the front panel, this information is saved in the SRAM.
After a "power-up" this information is read back again.

If you want, I can add some screenshots of the data transfer and the connection with the logic analyzer to the "PHOTOS" folder.

Best regards
Rico







--
Dennis Tillman W7pF
TekScopes Moderator

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