Hi all, on my last mouser order I decided to add a REF5010ID 3ppm/C 10V voltage reference figuring it would be handy to embed in a nice case with bananna jacks for testing multimeters and whatnot. (I have a stack of 3478A's I rescued that I am going to supercap-mod to allow easy changing/testing of the battery backup)
I additionally added a 10ppm/C .1% 10k resistor to my order, so my question is, if I add the resistor in series to the REF output, am I hurting it's usefulness as a voltage reference at all? My intuition says no as the multimeter itself has a megaohm or so resistance in voltage mode in it anyway, adding another 10k even if its imprecise should not affect the voltage measurement at all, is that true?
My reason for wanting to add the resistor is both to protect against an accidental short (not sure if the REF can handle that or not, spec sheet doesn't explicitly mention it but it does list 'short circuit current 25mA' in the parameters) but also so I can use it as a semi-precise 1mA reference. 10ppm .1% resistor and 3ppm 0.05% voltage combine to what accuracy of current reference?
Any other advice on how to set this up other than just wire the chip directly to the output for use as a stable lab reference? Is it normal to add a cap to the output? Thanks all!
John