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Decent benchtop multimeter for beginner?
Kleinstein:
There is a good chance they took the specs of an existing 5.5 digit meter as the design goal and the design team was spot on.
The sigilent meter has more detailed specs on different DC ranges - so not absolutely the same, but very close and possible matching a different DS version.
How good the meter will actually perform, especially over the longer time is a thing that only time will tell.
Anway a 5.5 digit meter is usually not bought because of it's accuracy - it is more for PC control, the noise, the ability to measure small voltages and have 4 wire ohms. If accuracy matters one often directly goes to 6 digits.
coromonadalix:
--- Quote from: live2fish88 on August 12, 2024, 01:52:05 pm ---It's too bad nobody offers a modular multimeter yet..
--- End quote ---
well you do have pci pxi pxie meter card loll not modular enough loll
J-R:
--- Quote from: Fungus on August 20, 2024, 07:21:21 am ---
--- Quote from: J-R on August 20, 2024, 03:58:23 am ---The BM857 has over 50 calibration points, for example, covering every function and range. So one photo at 5V is not showing much of anything.
--- End quote ---
FWIW my BM857s and Fluke 187 agree within a digit or so on every range except small currents*.
Both meters have laser trimmed precision resistor arrays which basically don't drift. All measurements are derived internally from voltage measurements so if the voltage ranges are good then the rest of the meter probably is, too.
--- End quote ---
There is absolutely plenty of opportunity for drift. Checking one point is just not a valid method for this. If those two DMMs haven't drifted, then that is great, but what you're saying is not something that can be applied and the photo isn't proof of the method.
Some DMMs DO follow a principle adjacent to this where they know which components are leveraged for each measurement path. So a performance verification procedure will heavily leverage that in order to reduce the number of tests that need to be performed by the operator.
The protection circuits can also make an impact depending on the voltage you are applying, so each range will still need to be checked.
Edit:
Link to the Fluke 187 calibration guide: https://www.tonyplaza.nl/download/YT251/187cal.pdf
There are 64 performance verification test steps.
There are 38 calibration inputs required.
Fungus:
--- Quote from: J-R on August 21, 2024, 10:22:37 pm ---There is absolutely plenty of opportunity for drift. Checking one point is just not a valid method for this. If those two DMMs haven't drifted, then that is great, but what you're saying is not something that can be applied and the photo isn't proof of the method.
--- End quote ---
I didn't check just one point, I checked many, but I only uploaded one photo, OK?
The only point I was making is that if two good quality meters from completely different backgrounds agree with other to within a digit, it makes a very strong case for trusting those meters.
W4HBM:
Hello Sir or Madam,
Some years ago YAESU introduced its FT-5000 series radio that had two small OLED displays in addition to the main display. The OLED displays were crapping out very fast, and many people returned their DOA transceivers. Then, Agilent came out with a hanheld portable DMM with an OLED display, and guess what? Even those displays were turning into cheese too soon. You can find an Agilent DMM with an OLED display pretty regularly, here and there, but that doesn't make up for the inherent lack of quality to make these displays bulletproof.
The Rigol DM858 display seems relatively trouble-free, but I'm sure if there's a smelly one in the pile I'm about to get it when UPS gets here with it.
Or maybe not. It would be wonderful to kickstart a new '858 and find the main display clear and concise, and for it to stay that way for a long while.
<My decades-old Fluke Handhelds are drifting apart, and their readings can't be trusted, and according to Fluke, there are no repairs! (89-IV, 279)
And I've sure come to despise LCD B&W displays that need me to be within 6 inches to read.
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