Re: [volt-nuts] HP-3458A Zero Reading
You talked about after an hour of warm up... I never turn mine off unless I have to... Like to move it, ship it or power outage. That said do not do anything like this until it has been on for 4 hours Then run auto cal Do not take any reading for 5 minutes after you change wiring or switches. Consider 1000 plc and or stats mode. Hope that helps On Sun, Jul 26, 2015 at 7:15 PM, Randy Evans wrote: > A bit of a false lead. I took the readings after an hour of warmup. > However, after about two hours, the zero reading went to less thatn 0.2 uV, > which seems just fine to me. I guess i just needed to get a really good > warmup time. > > However, the 752 readings are varying over several uV when doing the CAL > procedure. I am currently using unshielded leads so I suspect I am getting > a lot of noise. Time to invest in some really good cables I guess. I was > hoping to build my own cables as Bill Gold had suggested in a previous > thread. > > Randy AE6YG > ___ > 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. > -- *John Phillips* ___ 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.
[volt-nuts] HP-3458A Zero Reading
A bit of a false lead. I took the readings after an hour of warmup. However, after about two hours, the zero reading went to less thatn 0.2 uV, which seems just fine to me. I guess i just needed to get a really good warmup time. However, the 752 readings are varying over several uV when doing the CAL procedure. I am currently using unshielded leads so I suspect I am getting a lot of noise. Time to invest in some really good cables I guess. I was hoping to build my own cables as Bill Gold had suggested in a previous thread. Randy AE6YG ___ 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.
[volt-nuts] HP-3458A Zero Reading
I shorted the input terminals of my HP-3458A with a short lead of copper wire, Bell telephone wire as recommended in the manual. The reading I get is around 000.00070 mV, or 0.7 uV with NLPC set to 100. I was trying to evaluate it's use as a null meter for my Fluke 752A divider. This seems a little higher than I would expect but no amount of running AUTOCAL or ZERO changes this amount. Is this considered acceptable? Randy AE6YG ___ 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.
