Products > Test Equipment
A dream came true Today34401A Digital Multimeter, 6½ Digit DMM
DavidAzulay5000:
--- Quote from: J-R on February 22, 2023, 01:39:22 am ---I don't think the friends-pricing is valid for comparisons!
In my opinion, the 34401A is mostly good for accuracy & stability, but to capitalize on that you need to have it calibrated. Usability is becoming a bit outdated compared to the new stuff on the market Even something as simple as Min/Max is a pain in the neck.
--- End quote ---
Amazing device
In terms of calibration
I tested it compared to my Quadtech 1659 RLC DigiBridge
He is my standard in terms of accuracy
Indeed all the resistance of the resistors exactly
From 5 milli ohms to 100 mega ohms
The only thing I did to 34401A
This is a short calibration
I was surprised that the milliohm resistance measurement was accurate even with 2 wires
NoisyBoy:
Then you are assuming the Quadtech is your reference standard, when did you last check its calibration?
The 34401A is capable of better than 0.01% accuracy in resistance measurement, which far exceeds the Quadtech spec of 0.1%. So while what you do can verify whether it is in the ballpark, it is far from the calibration 3-R suggested. As the full calibration also check on other functions beyond resistance as well.
However, many 34401A hold its accuracy well, perhaps that’s all you need, and that is perfectly acceptable. But if you need a 6.5 digit meter for high precision and accuracy, then I agree with 3-R that a full calibration is a good investment.
I think annual calibration may be excessive for most hobbyists except the volt nuts, I personally would send a used meter for calibration, so i know I can trust its reading. Especially if it has not been calibrated for a few years.
In any event, congratulations on your new meter. I have a couple, I love their silent operation and fast boot time. But if you need to see MIN-MAX, then I think newer meters definitely have an advantage.
Enjoy your new meter. Outside of a calibration,I would also suggest a new VFD if you want the ultimate readability.
DavidAzulay5000:
--- Quote from: NoisyBoy on February 22, 2023, 06:16:13 am ---Then you are assuming the Quadtech is your reference standard, when did you last check its calibration?
The 34401A is capable of better than 0.01% accuracy in resistance measurement, which far exceeds the Quadtech spec of 0.1%. So while what you do can verify whether it is in the ballpark, it is far from the calibration 3-R suggested. As the full calibration also check on other functions beyond resistance as well.
However, many 34401A hold its accuracy well, perhaps that’s all you need, and that is perfectly acceptable. But if you need a 6.5 digit meter for high precision and accuracy, then I agree with 3-R that a full calibration is a good investment.
I think annual calibration may be excessive for most hobbyists except the volt nuts, I personally would send a used meter for calibration, so i know I can trust its reading. Especially if it has not been calibrated for a few years.
In any event, congratulations on your new meter. I have a couple, I love their silent operation and fast boot time. But if you need to see MIN-MAX, then I think newer meters definitely have an advantage.
Enjoy your new meter. Outside of a calibration,I would also suggest a new VFD if you want the ultimate readability.
--- End quote ---
this is all i need dont use MIN-MAX
coromonadalix:
i had some of my 3x 34401a meters checked and 2 of them ended being calibrated, but the cal facility said they where on par / within the specs 10-15 years later ....
i recapped 2 of them, and 1 of them had an clone vfd installed in it ........
now upped the game with an 34410a, who got a new cloned vfd tooo
you have some software here on eevblog if you want to do some logging ....
DavidAzulay5000:
--- Quote from: coromonadalix on February 22, 2023, 11:16:51 am ---i had some of my 3x 34401a meters checked and 2 of them ended being calibrated, but the cal facility said they where on par / within the specs 10-15 years later ....
i recapped 2 of them, and 1 of them had an clone vfd installed in it ........
now upped the game with an 34410a, who got a new cloned vfd tooo
you have some software here on eevblog if you want to do some logging ....
--- End quote ---
I know the software
Later I will install it on one of my computers that has a GPIB connection.
I am very pleased with the purchase
Usually all my measuring equipment I bought broken and repaired and calibrated after that.
This is one of the only devices I've purchased that is completely working.
He had another 34401A that I could have purchased much cheaper because it had a problem measuring resistor values less than 2 ohms and I did not purchase it even though it is very easy to fix it in the future I might purchase it as well because I really liked the performance of the 34401A .
I tested the 34401A today
in a 4 wire connection
for measuring resistances
of my VISHAY precision resistor collection
0.01%
And all the measurements were exact
I'm going to use it mostly for measuring short circuits.
That's why the milliohm resistor measurements were most important to me
On a daily basis I use my Quadtech 1659 RLC DigiBridge project
which is an amazing measuring device .
Its only problem is that the measurements are made on the 4-wire Digibridge fixture connector on the device
That means to measure anything you have to connect the component directly to 1659
Do you know how pleased I was that the 34401A
Gave me the same results as the 1659
that the 1659 I calibrated.
It is very easy to calibrate, you only need 4 precision resistors with specific values
24.895 ohms and 15 ppm
374.06 ohm 5ppm
5.9581 kilohms 22ppm
94.986 kilohms 280ppm
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