Author Topic: NEW PDVS2mini DC Voltage Reference from Ian Johnston - Reviewed.  (Read 43906 times)

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Offline Paul_txl

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Re: NEW PDVS2mini DC Voltage Reference from Ian Johnston - Reviewed.
« Reply #50 on: February 08, 2024, 09:46:40 am »
I've been looking at buying one for a couple of years but I thought you had stopped selling them post covid. I should have used the "email when available" link, my bad. Glad its nothing too serious thats stopped you and hope you enjoy your other interests.
 
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Offline flo.b

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Re: NEW PDVS2mini DC Voltage Reference from Ian Johnston - Reviewed.
« Reply #51 on: February 14, 2024, 12:03:02 am »
Woah, all the best Mr. Johnston!

Absolute bummer though, this product is amazing and deserves to be continued! And I was waiting for the new production.. ;)

Wish I could help with this, but I'm afraid I lack the experience. Hopefully a new partner can be found soon!
 
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Offline J-R

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Re: NEW PDVS2mini DC Voltage Reference from Ian Johnston - Reviewed.
« Reply #52 on: March 21, 2024, 03:02:04 am »
Just saw this:
"The design rights to the PDVS2mini has been SOLD.
Forwarding information for the new manufacturer will be published soon."
 
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Online IanJ

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Re: NEW PDVS2mini DC Voltage Reference from Ian Johnston - Reviewed.
« Reply #53 on: March 23, 2024, 01:43:05 pm »
Just saw this:
"The design rights to the PDVS2mini has been SOLD.
Forwarding information for the new manufacturer will be published soon."

Nearly 5 years of home production of the PDVS2mini and 40yrs in the oil industry (mostly electronics related) it's time to retire, part health issues and part "it's time".
The demand for the PDVS2mini has never been higher and I think it will be in great hands, so please give them some time to get their ducks in a row, keep your eye on my website for updates.

For me, I am still doing a couple days a week in oil just for a wee while so the folks taking over my work can make good.......so lets, for the moment, call it semi-retirement.
Meanwhile I am forging ahead having fun with my YouTube channel and test instrument repairs.......so if you have any faulty gear you don't need then please contact me.

Ian.

Ian Johnston - Original designer of the PDVS2mini || Author of the free WinGPIB app.
Website - www.ianjohnston.com
YT Channel (electronics repairs & projects): www.youtube.com/user/IanScottJohnston, Twitter (X): https://twitter.com/IanSJohnston
 
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Offline donlisms

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Re: NEW PDVS2mini DC Voltage Reference from Ian Johnston - Reviewed.
« Reply #54 on: March 23, 2024, 06:26:51 pm »
Ian, this enhanced picture of what's going on with you is encouraging for those of us who tend to assume the worst.  Thanks for the update. All the best!
 
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Offline p.larner

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Re: NEW PDVS2mini DC Voltage Reference from Ian Johnston - Reviewed.
« Reply #55 on: March 31, 2024, 06:40:55 am »
why not release this as an open source project?.
 

Offline 2N3055

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Re: NEW PDVS2mini DC Voltage Reference from Ian Johnston - Reviewed.
« Reply #56 on: March 31, 2024, 08:33:49 am »
why not release this as an open source project?.

And why would he?

It is a low cost calibrator. Apart from Ian making a nice and elegant design, for users of device 99% of utility of buying it was fact that Ian kept calibrated KS3458 that he calibrated devices with. And he did a top notch job, too.
You were buying calibration, mostly, not device per se.
Without proper calibration it's not very useful...
Without proper calibration it is just a source of stable voltage.

And also, people that do the hard work should get paid for it.
 
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Offline TheDefpomTopic starter

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Re: NEW PDVS2mini DC Voltage Reference from Ian Johnston - Reviewed.
« Reply #57 on: March 31, 2024, 08:45:31 am »
Ian deserved to earn some money by selling his design to someone that was willing to continue the work and ensure that people could still buy the units, and as mentioned, building the thing is only half of it, a decent calibration of the PDVS2mini is the critical bit there.
Cheers Scott

Check out my Electronics Repair, Mailbag, or Review Videos at https://www.youtube.com/TheDefpom
 
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Offline Kean

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Re: NEW PDVS2mini DC Voltage Reference from Ian Johnston - Reviewed.
« Reply #58 on: March 31, 2024, 10:56:14 am »
why not release this as an open source project?.

If he was shutting his business down completely, then that would be ideal.  It benefits the community and allows existing owners to maintain their units.
But as 2N3055 explains, a large part of the value of such a device is in the calibration which your average DIY builder would not have access to.

For as long as it is a viable product, it makes much more sense to sell the business/IP as a going concern and have someone continue the manufacture and calibration.  While the market is somewhat limited, there was clearly demand as Ian would quickly sell out of each production batch.  It took me a few in-stock notifications before I had an opportunity to grab one for myself.  His pricing was very fair, and I don't think anyone reputable could provide them significantly cheaper.
 
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Online skander36

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Re: NEW PDVS2mini DC Voltage Reference from Ian Johnston - Reviewed.
« Reply #59 on: March 31, 2024, 11:25:44 am »
why not release this as an open source project?.

There are other projects as open sources.
One of them is here - https://www.elektormagazine.de/labs/voltage-current-calibrator-0-to-10v-and-0-to-40ma-0001
with atempts to replicate here : - https://www.eevblog.com/forum/testgear/elektor-voltage-current-calibrator-project/
But as you can see and guys here explain before me, the main issue is the calibration of such device, even the methodology for aquiring repetable results is not easy.
 
« Last Edit: May 11, 2024, 08:51:31 pm by skander36 »
 
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Offline J-R

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Re: NEW PDVS2mini DC Voltage Reference from Ian Johnston - Reviewed.
« Reply #60 on: May 11, 2024, 08:43:25 pm »
Ian starts talking a bit about his now sold PDVS2mini design in this podcast starting here:
https://youtu.be/kTpmiK5p_Wc?t=1152

New owners are making some improvements:
https://youtu.be/kTpmiK5p_Wc?t=1923
 
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Offline Svgeesus

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Re: NEW PDVS2mini DC Voltage Reference from Ian Johnston - Reviewed.
« Reply #61 on: May 13, 2024, 10:15:19 am »
For the (now discontinued) PDVS2, the manual says that there is a simple ascii protocol available on request. I have one of these, and would like to be able to program a fairly complex sequence of voltage steps far beyond the 5 steps provided by the windows electable. Is that still available or would I need to contact the new owners of the PDVS2mini?

I'm very happy with this as a manually-programmable voltage source, but (in contrast to the observation in the podcast that "everyone was just using it for it's basic functionality" I also want to use it in an automated test setup to examine the performance of voltage-controlled oscillators; this requires around 100 steps for a full test.
« Last Edit: May 13, 2024, 10:22:52 am by Svgeesus »
 

Online IanJ

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Re: NEW PDVS2mini DC Voltage Reference from Ian Johnston - Reviewed.
« Reply #62 on: May 13, 2024, 10:23:32 am »
Go to my website, online shop and look up the manual for the PDVS2mini, the comms protocol is published there……which is almost identical to the PDVS2.
I will provide the actual protocol for the PDVS2 on this thread later today.
Ian Johnston - Original designer of the PDVS2mini || Author of the free WinGPIB app.
Website - www.ianjohnston.com
YT Channel (electronics repairs & projects): www.youtube.com/user/IanScottJohnston, Twitter (X): https://twitter.com/IanSJohnston
 
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Offline Svgeesus

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Re: NEW PDVS2mini DC Voltage Reference from Ian Johnston - Reviewed.
« Reply #63 on: May 13, 2024, 10:46:41 am »
Perfect, so <KeyVoltage,0,1.23456> is all it takes in terms of commands(!) wonderful
 

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Re: NEW PDVS2mini DC Voltage Reference from Ian Johnston - Reviewed.
« Reply #64 on: May 13, 2024, 05:38:29 pm »
Perfect, so <KeyVoltage,0,1.23456> is all it takes in terms of commands(!) wonderful

There are slight changes depending on firmware version, but here's the protocol text doc for the PDVS2.

Code: [Select]
PDVS2 Serial Protocol (PVDS2 firmware 3.00)
===========================================

INTERFACE = USB (FTDI USB Drivers - http://www.ftdichip/Drivers/VCP.htm)
BAUD: 250k,N,8,1
A simple bi-directional ascii based serial data protocol
Rate = Data from PDVS2 to PC is sent every 110mS

Format to PC:- VR0,0,12345
Format from PC:- <KeyVoltage, 12, 1.23456>

The following details all the data being sent from the PDVS2, and only a partial listing of the data from the PC.


PDVS2 OUTPUTS TO PC:
========================
KV,0, Output Voltage of PDVS2
BV,0, Battery Voltage or DC Input Voltage
BVFM,0, Battery Voltage Feed Mult
OVF,0, Output Voltage Feedback
OVFM,0, Output Voltage Feedback
dacZ,0, DAC Zero Cal
dacS,0, DAC Span Cal
BC,0, Message = DC Input - Charging, DC Input, DC Input - Full, Running on Batteries, Battery Charge high mA!
BLI,0, Message = Status - Low, Status - Ok
Mode,0, Message = Main Menu, Normal, Calibration, Settings, Playback, Ramp

VA0,0, Volts Auto Set[0]
VA1,0, Volts Auto Set[1]
VA2,0, Volts Auto Set[2]
VA3,0, Volts Auto Set[3]
VA4,0, Volts Auto Set[4]

TA0,0, Time Auto Set[0]
TA1,0, Time Auto Set[1]
TA2,0, Time Auto Set[2]
TA3,0, Time Auto Set[3]
TA4,0, Time Auto Set[4]
AC,0, Autocount
AMR,0, Message = Running, Stopped

VR0,0, Volts Ramp Set[0]
VR1,0, Volts Ramp Set[1]
VR2,0, Volts Ramp Set[2]
VR3,0, Volts Ramp Set[3]
VR4,0, Volts Ramp Set[4]

TR0,0, Time Ramp Set[0]
TR1,0, Time Ramp Set[1]
TR2,0, Time Ramp Set[2]
TR3,0, Time Ramp Set[3]
TR4,0, Time Ramp Set[4]
RC,0, Ramp count
RMR,0, Message = Running, Stopped

BMIM,0, Battery Monitor IC Mult
BI,0, Battery current
AL,0, Autoloop
RL,0, Ramploop
SC2,0, Seconds2
dacZ2,0, DAC Zero Cal Dac2
dacS2,0, DAC Span Cal Dac2
VRS,0, Vref Switch
CMS,0, Cal Mode Sub


OUTPUT FROM PC TO PDVS2:
========================
<KeyVoltage,0,1.23456> Voltage requested to output from PDVS2
<VrefSet,0> Vref setting, 0=10v mode, 1=2v mode


Ian Johnston
Ian Johnston - Original designer of the PDVS2mini || Author of the free WinGPIB app.
Website - www.ianjohnston.com
YT Channel (electronics repairs & projects): www.youtube.com/user/IanScottJohnston, Twitter (X): https://twitter.com/IanSJohnston
 
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Offline ComradeXavier

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Re: NEW PDVS2mini DC Voltage Reference from Ian Johnston - Reviewed.
« Reply #65 on: May 19, 2024, 02:38:37 pm »
I fumbled my PDVS2mini taking it off the shelf and dropped it onto my bench. Thankfully, it seems to have survived undamaged. I decided its front panel needed some protection from me (and also from the dust that settles on anything I don't touch twice a day).

This case has a nice close fit, a satisfying magnetic closure, and a storage slot so I don't lose the charging cable. (I should find where I stashed the cal sheet and stick that in there, too.) I used PETG for impact resistance and strong layer bonding.

2223637-0

2223643-1

If anyone has the same butterfingers problem and wants to make their own, I've attached the .step file.

Hardware is:
  • M2.5x25 with nylon lock nut, qty 2 (for hinge pins)
  • 6x2.7 mm magnet, qty 4 (commonly sold as 6x3 mm, I designed for the actual thickness of the ones I have)
 
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Offline wrytech

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Re: NEW PDVS2mini DC Voltage Reference from Ian Johnston - Reviewed.
« Reply #66 on: June 18, 2024, 09:52:18 pm »
Time for an official update on the PDVS 2 Mini!

In the past weeks and months since I have taken over the design from Ian a lot of things happened and thus the PDVS 2 Mini is on a good way to make a return under the newly created wrytech brand.

The tasks at hand always alternated between the technical things to ensure that my version will be up to the standards set by Ian and managing all things business related and bureaucratic - with the latter being a lot more involved than expected (who would have thought?).

Today I picked my 3458A back up from calibration at ab-precision and it is very comfortably within the 90-day spec for DCV and with that the last open thing from a technical side is taken care of. The first 50 boards of the version 1.6 have been here with me for a couple weeks with everything working smoothly, also thanks to the constant exchange with and inputs from Ian.

Changes for the new version 1.6 include:
  • Maximum output voltage increased to 10.22222V from 10.00000V with additional calibration point
  • Addition of an internal temperature sensor
  • Updated optics on the front panel and slight changes on the PCBs for improved manufacturability (reverse mount LED for the comms indicator for example), all critical analogue circuitry remains completly unchanged

Other than that, everything stays the same; all remaining stocked parts, test jigs, etc. have been taken over and as stated already the goal is to continue seamlessly where Ian has left off.

For now, one official matter is outstanding, but should be done in the upcoming weeks and the units can go on sale then.

To sign up for the newsletter head over to wrytech.eu. Updates will be posted here as well and any questions are more than welcome, of course.

Thanks again to Ian for the continued support and feedback provided,
Johannes

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Re: NEW PDVS2mini DC Voltage Reference from Ian Johnston - Reviewed.
« Reply #67 on: June 19, 2024, 06:49:41 am »
All the best Johannes and Wrytech going forward. The PDVS2mini is in good hands.

Ian
Ian Johnston - Original designer of the PDVS2mini || Author of the free WinGPIB app.
Website - www.ianjohnston.com
YT Channel (electronics repairs & projects): www.youtube.com/user/IanScottJohnston, Twitter (X): https://twitter.com/IanSJohnston
 
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Online skander36

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Re: NEW PDVS2mini DC Voltage Reference from Ian Johnston - Reviewed.
« Reply #68 on: June 19, 2024, 07:12:16 am »
Hi! Alll the best in the start of this takeover of an already success product!
My question is if you will take care of the support for the old ver.(calibration, repairs)?
Thank you!
 

Offline aronake

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Re: NEW PDVS2mini DC Voltage Reference from Ian Johnston - Reviewed.
« Reply #69 on: June 19, 2024, 01:36:36 pm »
10.2222 Volt is a nice upgrade!

How is the temperature sensor implemented?

If digital readout by the software, then that opens up for the idea of having say 3 calibration curves, one at 17C, one at 23C and one at 29C then interpolate between these to eliminate much of temperature coefficient of that output. That would be a super cool feature and should not be too difficult to implement if digital temperature sensor is there.
 

Offline aronake

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Re: NEW PDVS2mini DC Voltage Reference from Ian Johnston - Reviewed.
« Reply #70 on: June 19, 2024, 01:39:31 pm »
ah, looking at the pictures i see now that there is digital readout on the display. great!
 

Offline tatel

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Re: NEW PDVS2mini DC Voltage Reference from Ian Johnston - Reviewed.
« Reply #71 on: June 19, 2024, 01:51:11 pm »
Looking forward to get one of these. Having to send it out of the EU to calibrate, etc, was the bump in the road for me. But if it can be done within the EU, then I want one...

Best wishes
 
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Offline J-R

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Re: NEW PDVS2mini DC Voltage Reference from Ian Johnston - Reviewed.
« Reply #72 on: June 20, 2024, 10:20:28 pm »
I also would like to know about obtaining calibrations for the previous model.  It also would be nice to have a US-based option.
 

Offline wrytech

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Re: NEW PDVS2mini DC Voltage Reference from Ian Johnston - Reviewed.
« Reply #73 on: June 23, 2024, 09:51:55 am »
Thanks for all the feedback and input provided already, very nice to see!

To answer the questions and open points brought up:
  • I will of course also provide (re)calibration and adjustment if needed / wanted for the PDVS 2 Mini and its predecessors.
    I can also do a firmware update in the process to extend the output of earlier versions to 10.22222V with the additional calibration point as well if wanted, leaving the temperature sensor then as only difference to v1.6.
  • Same goes for repairs for the PDVS 2 Mini - as stated, I have taken over the complete stock of parts from Ian, so I can do exact repairs for previous versions even if components are different now
  • The temperature sensor used is a TI TMP112A, with the current value shown on the display. Have not gotten around to add the temperature value to the serial communication protocol, but will do so going forward. Another thing might be a small indicator to show when the unit should have warmed up, as there is around a 10 K temperature difference to ambient once fully warmed up, which takes about 30 mins to settle if the unit was turned off before.

Thanks and Best,
Johannes
 
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Online cmu2017

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Re: NEW PDVS2mini DC Voltage Reference from Ian Johnston - Reviewed.
« Reply #74 on: July 10, 2024, 12:25:02 pm »
Hi Johannes,
And when can we expect the first ones for sale?
 


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