Speaking of the 03458-66529 reference board added to the HP 3458A by Fluke
(before Fluke offered the 8508A), has anyone ever seen a schematic of that
board or how Fluke could rate that reference at 2 ppm? One person on this
forum theorized that by lowering the operating temperature of the LTZ1000A to
around 70 degrees C, which is what the LTC device specification note
recommends, this might have what was done to achieve the better drift
specification. It was noted that HP was running the LTZ1000A at around 105
degrees C which might accelerate the aging rate. I lowered my references to
around 70 C and they have seemed to be a little more stable when checked
against the Fluke 732A DC Reference Standard. But I never started a project to
follow up on this theory. Just another project to play with when I "get a
round toit"
Bill
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