On Aug 2, 2009, at 5:00 AM, [email protected] wrote:
Message: 4 Date: Sun, 02 Aug 2009 03:00:06 +0200 From: "Dr. Frank Stellmach" <[email protected]> Subject: [time-nuts] 3458A info To: [email protected] Message-ID: <[email protected]> Content-Type: text/plain; charset=ISO-8859-15; format=flowed Dick, did you already try an ACAL DCV, or ACAL ALL from the front panel? Maybe the false cal constants will be set correctly. In the calibration manual, its explained, which constants are set by atocal (and cured), and which one are set by basic calibration, requiring external standards (10 volt, 10kohm). I think, DAC Vos and 10V gain are set by ACAL. Frank
Yes, tried all that. Last night I gave up and opened the box, which I had been reluctant to do -- DC board had burned components right in the center. There are 2 unrecognizable ICs and a handful of resistors, etc, and a badly charred board. Probably unrepairable. Have no idea what could have happened to make it so bad without also killing the power supplies, which are AOK. Shouldn't have been anything on the input, which is protected against over-voltage/-current. Too bad.
Thanks for all the advice and tips. Dick Moore _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
