| Electronics > Metrology |
| NEW PDVS2mini DC Voltage Reference from Ian Johnston - Reviewed. |
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| tonyalbus:
--- Quote from: J-R on December 19, 2024, 09:49:56 am ---I suppose there will need to be an update to the software to support the 10.22222V output and perhaps some other aspects? But you could try Ian's Windows software: https://web.archive.org/web/20240617223338/https://www.ianjohnston.com/images/stories/IanJ/VoltageSourcePrecision/PDVS2mini/PDVS2mini.zip --- End quote --- Thanks! Yes the intrnet archive, i forgot. Great that was what i was looking for. Ian made some great software for GPIB and just watched an old video how he automated the whole bulk calibration for the PDVS, very impressive stuff. |
| Cyclotron:
I received my unit yesterday. I regularly get things from mainland China faster. I'm not lodging a complaint; it's just an observation. I highly suspect that the holidays and maybe even Canadian post being offline have impacted global shipping. I ordered a KWeld board out of Toronto that should take 2-3 days to Virginia, and it took 2.5 weeks via FedEx. Okay, what a nice device! I immediately did what most people, I figure, will do: I hooked it up to every meter I had to check its accuracy. I'm happy to say my primary two bench meters are perfect or thereabouts. That means the recent calibrations I've made are likely good. I have noticed a behavior I haven't seen reported, and I wanted to mention it here for WRY TECH and others. I charged mine overnight, and this morning, I was nerding around with it (definitely not fondling). I turned it off and set it aside when I realized I wanted to check the firmware version. I clicked the power button, and the display showed the images in the attached photos. My stomach sank a bit. I think I clicked the button for more time, and it came to life normally. In the end, I can reproduce the results easily. If you just tap the power button the display will pop up some lines and slowly clear. I suspect there's some logic in there that prevents bumping the device and changing the power state. But I'm not sure. |
| IanJ:
--- Quote from: Cyclotron on December 24, 2024, 05:41:09 pm ---I received my unit yesterday. I regularly get things from mainland China faster. I'm not lodging a complaint; it's just an observation. I highly suspect that the holidays and maybe even Canadian post being offline have impacted global shipping. I ordered a KWeld board out of Toronto that should take 2-3 days to Virginia, and it took 2.5 weeks via FedEx. Okay, what a nice device! I immediately did what most people, I figure, will do: I hooked it up to every meter I had to check its accuracy. I'm happy to say my primary two bench meters are perfect or thereabouts. That means the recent calibrations I've made are likely good. I have noticed a behavior I haven't seen reported, and I wanted to mention it here for WRY TECH and others. I charged mine overnight, and this morning, I was nerding around with it (definitely not fondling). I turned it off and set it aside when I realized I wanted to check the firmware version. I clicked the power button, and the display showed the images in the attached photos. My stomach sank a bit. I think I clicked the button for more time, and it came to life normally. In the end, I can reproduce the results easily. If you just tap the power button the display will pop up some lines and slowly clear. I suspect there's some logic in there that prevents bumping the device and changing the power state. But I'm not sure. --- End quote --- This is caused by not holding the power button down long enough when you want to power it up. The soft power circuit is integrated into the software, so when you just quickly jab the power button it does send 3.3Vdc to the display & uController but not long enough for the software to run and interact with the soft power switch hardware in order to hold the power on permanently. The proper way to power up is to hold the power button for a second or so.....then release. There's nothing wrong with your PDVS2mini. Ian. |
| glitchcatcher:
--- Quote from: Cyclotron on December 24, 2024, 05:41:09 pm ---In the end, I can reproduce the results easily. If you just tap the power button the display will pop up some lines and slowly clear. I suspect there's some logic in there that prevents bumping the device and changing the power state. But I'm not sure. --- End quote --- It's perfectly normal behavior. IIRC it's written in the manual that you have to hold the power button to turn it on. It's either against accidental power on as you say, or the µC is disconnected from the battery by that push button, and holding it down energizes the circuit and it takes some time to initialize and bypass that button electronically so the device stays on. That would be a power saving feature then which is just a guess. Wondering if that's still necessary with todays µCs standby/sleep currents. |
| Cyclotron:
--- Quote from: IanJ on December 24, 2024, 05:55:01 pm --- The proper way to power up is to hold the power button for a second or so.....then release. There's nothing wrong with your PDVS2mini. Ian. --- End quote --- Yup, that's what I figured, and I just didn't communicate well in my post. I only posted about it in case others saw it, and, as I did, a mild panic attack. I prefer it like it is; as you said, there is nothing wrong with it. |
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