Just a quick report on my 8840A.
Compared to my 87-IV both meters read the same on DC volts from my lab supply. My 77 was reading a bit high so I tweaked the adjustment pot at 3.0000 V according to the 8840 and now it seems accurate as well.
The calibration sheet for my voltage standard says the DCv is 5.0000v and by golly all of my Flukes agree.
This is not a calibrator or any provable true standard, just a "pretty damn accurate" standard measured with a really calibrated meter at time of build.
I was going to set up a photo of all 3 flukes, a Micronta and a 1 hung low DMM and 2 Micronta analog meters all measuring the same voltage, but I don't have the time or patience to get all of that happening on my very messy bench, so here are the 3 Flukes connected to the voltage standard.
DC milliamps also look pretty accurate on the 8840 and the 87. Looks like my 77 has a blown fuse (who knew?)
Resistance is off by .0002k or so, but I didn't spend any time waiting for settling or writing down accurate readings, nor do I know what the ambient temp is. My calibration sheet on the resistances was at 69F.
Suffice it so say, for my purposes any of my Flukes are accurate enough and then some.
Compared to my 87-IV both meters read the same on DC volts from my lab supply. My 77 was reading a bit high so I tweaked the adjustment pot at 3.0000 V according to the 8840 and now it seems accurate as well.
The calibration sheet for my voltage standard says the DCv is 5.0000v and by golly all of my Flukes agree.
This is not a calibrator or any provable true standard, just a "pretty damn accurate" standard measured with a really calibrated meter at time of build.
I was going to set up a photo of all 3 flukes, a Micronta and a 1 hung low DMM and 2 Micronta analog meters all measuring the same voltage, but I don't have the time or patience to get all of that happening on my very messy bench, so here are the 3 Flukes connected to the voltage standard.
DC milliamps also look pretty accurate on the 8840 and the 87. Looks like my 77 has a blown fuse (who knew?)
Resistance is off by .0002k or so, but I didn't spend any time waiting for settling or writing down accurate readings, nor do I know what the ambient temp is. My calibration sheet on the resistances was at 69F.
Suffice it so say, for my purposes any of my Flukes are accurate enough and then some.
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