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| DMMCheck Plus Multimeter Reference(and other References) - Experiences.. |
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| Martin72:
Hi, Any recommendations for really good "state of the art" test leads/clips ? Except for the set from Probemaster I have found nothing... |
| dmmguy:
--- Quote from: Veteran68 on September 08, 2023, 08:54:16 pm ---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. --- End quote --- They (AD584) take about 3 hours o more to reach an "acceptable stable" status, I always keep them working for more than 72 hours the very first time. I sell those boards with a cal cert measured with a Agilent/Keysight 34461A, it is not the best but may be useful for 4.5 and 5.5 digits and even for 6.5 if used at approx same cal temp. https://www.ebay.ca/itm/155763974742 |
| KungFuJosh:
--- Quote from: Martin72 on September 10, 2023, 10:14:23 pm ---Any recommendations for really good "state of the art" test leads/clips ? Except for the set from Probemaster I have found nothing... --- End quote --- Almost all of my test leads are from probemaster. Their kits/accessories are excellent. Are you looking for something they don't offer? |
| Veteran68:
--- Quote from: dmmguy on September 11, 2023, 01:39:35 pm ---They (AD584) take about 3 hours o more to reach an "acceptable stable" status, I always keep them working for more than 72 hours the very first time. I sell those boards with a cal cert measured with a Agilent/Keysight 34461A, it is not the best but may be useful for 4.5 and 5.5 digits and even for 6.5 if used at approx same cal temp. https://www.ebay.ca/itm/155763974742 --- End quote --- Interesting. Are you building these boards yourself, or reselling imported boards? My understanding as the AD584's in these imported boards are mostly pulls from old equipment, so already at various stages of aging. It would be nice to have some idea of provenance at least. I do wish that particular board was built for a more practical battery, such as the A23 12V battery the purple board has. The 15V square batteries are expensive and hard to find. I bought two of the green Chinese 10F20 batteries on eBay for around $10 and one was flat within a year. The other I haven't bothered unwrapping, it may be dead too. The Exell branded ones are probably better quality but go for $20 each! So I was using it with a DC barrel plug from my bench PS, but since this board had the bogus cal sheet that just about everyone else got, it was pretty much useless for its intended purpose. My favorite among those AD584 variants is the one with the purple board, as it has a practical battery, the option to use a DC plug, and includes reference resistor measurements also. However now that I have a DMMCheckPlus rev6 on order with all options, these will be relegated to backup or consensus/sanity check purposes. |
| Veteran68:
--- Quote from: KungFuJosh on September 11, 2023, 01:57:18 pm --- --- Quote from: Martin72 on September 10, 2023, 10:14:23 pm ---Any recommendations for really good "state of the art" test leads/clips ? Except for the set from Probemaster I have found nothing... --- End quote --- Almost all of my test leads are from probemaster. Their kits/accessories are excellent. Are you looking for something they don't offer? --- End quote --- I second the Probe Master recommendation, at least for bench use. I have 3 sets for my bench meters, including one set of the spring-loaded needle tip variety. I don't like them as much for portable DMM use, as the probes are quite a bit bulkier than the typical slim probes, though they do feel great in the hand. My next favorite have been the Brymen leads. I ordered an extra couple of sets to use in good handheld DMMs that came with shitty leads, like the super stiff TL75 PVC leads that came with the Fluke 117. I even ordered a set of TL71 leads for it which are softer but the probes still feel cheap and had inconsistent contact even after cleaning. BTW, Fluke's website still advertises the 117 as shipping with silicone leads. Lies! (sorry for the OT Fluke rant) |
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