Products > Test Equipment
DMMCheck Plus Multimeter Reference(and other References) - Experiences..
KungFuJosh:
I got one of these AD584JH voltage refs in, and it seems to work fine. It was advertised as an AD584L, which I'm not surprised was a lie. They didn't bother to include the fake calibration either.
On my SDM3055X-E I got:
10.0009V
07.5013V
05.0004V
02.5001V
That seems pretty good. The 7.5V and 10V takes a while to get up to their voltage range. After that it seems like it takes some time for the voltages to settle on their targets. Once settled, the voltage is stable.
Anybody else have the same behavior with their similar reference?
Right now I'm leaving the 7.5V test on to see if it gets any closer to 7.5000. 7.5013 was still stable after an hour.
Thanks,
Josh
Veteran68:
My Agilent 34401A and SDM3065X all get to a stable voltage within a second or two. If you continue to hold the probes, they will creep up very slowly, like one count every 4-5 seconds.
I just tested against the following standards consisting of 3x AD584s (2x LH and 1x KH), a LM399, and a LB02A process calibrator. The AD584LH that looks like yours (that takes the funky 15V battery) came with the fake cal sheet that everyone else has seen. The others seem to have genuine values that measure within about 1mV on both meters.
KungFuJosh:
--- Quote from: Veteran68 on September 08, 2023, 08:54:16 pm ---If you continue to hold the probes, they will creep up very slowly, like one count every 4-5 seconds.
--- End quote ---
Ah, weird! I was using probes clipped to the ref, and it took a minute or two to get to 10V. I turned it on without probes connected this time, then tested and it got to the voltage in a few seconds. 🙄
Where did you get that purple AD584LH board from?
Veteran68:
--- Quote from: KungFuJosh on September 08, 2023, 09:37:07 pm ---Where did you get that purple AD584LH board from?
--- End quote ---
https://www.aliexpress.us/item/3256804431053626.html
Veteran68:
--- Quote from: Veteran68 on September 05, 2023, 12:41:39 pm ---Not sure, but I hope it's the improved model. I didn't see where they actually say anything about the new model on their site. They just changed the banner to say they're now taking pre-orders, and changed the product order page to not charge extra for the add-ons (even though they still have the drop-down selection controls for them as if they're optional). I added everything including dual frequencies and the price didn't change.
--- End quote ---
So I sent them an email today asking for any details about this "new" version and when pre-orders would ship. Russ responded this evening:
"This is the Rev 6 version with all the options, meaning the new LC daughter board introduced last year (installed), dual frequencies of 100 Hz and 10 kHz, the enclosure with acrylic top and a free calibration if you send it back within two years. Shipping will commence after their 250 hour burn-in, which improves the stability of the voltage reference."
So other than all options included, nothing about any design changes or improvements.
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