Hello, I'm comparing different "AUTOCAL" techniques, like in the HP3458A, Fluke 5440A, 5720A, and have recently discussed the 34465A/34470A "ACAL" feature with Keysight. The Datron 1281 had a SelfCal feature, which is briefly described as relying on a special SelfCal module inside this instrument. This should enable the instrument to make a complete (?) recalibration possible, between the annual calibration dates, or during room temperature changes, maybe comparable to the 3458A ACAL. The Fluke 8508A is obviously based upon the Datron 1281, but does not have this SelfCAL feature & module. Now, here's my question: Does any volt-nuts here, have an idea, what's hidden behind this 1281 SelfCAL module, and how its capability is, also regarding its specification improvement? Are there any schematics or descriptions available? Thanks - Frank

I recently picked up a 1281 that is throwing a couple of errors. While researching the problem, I looked for the SelfCAL description and did not see anything conclusive. I will pull out my schematics and see if there are any references to a particular module. I was under the impression they were using the second LTZ1000 reference module for this function but was never certain. I have the full repair manuals of the 1281 from Manuals Plus before they stopped selling. I will look up anything I can find this evening. Todd On Thu, Oct 29, 2015 at 11:59 AM, Frank Stellmach < frank.stellmach@freenet.de> wrote: > Hello, > I'm comparing different "AUTOCAL" techniques, like in the HP3458A, Fluke > 5440A, 5720A, and have recently discussed the 34465A/34470A "ACAL" feature > with Keysight. > > The Datron 1281 had a SelfCal feature, which is briefly described as > relying on a special SelfCal module inside this instrument. This should > enable the instrument to make a complete (?) recalibration possible, > between the annual calibration dates, or during room temperature changes, > maybe comparable to the 3458A ACAL. > > The Fluke 8508A is obviously based upon the Datron 1281, but does not have > this SelfCAL feature & module. > > Now, here's my question: > > Does any volt-nuts here, have an idea, what's hidden behind this 1281 > SelfCAL module, and how its capability is, also regarding its specification > improvement? > Are there any schematics or descriptions available? > > Thanks - Frank > _______________________________________________ > volt-nuts mailing list -- volt-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts > and follow the instructions there. >