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Ian Johnston Engineering PDVS2mini Manual

Handheld precision digital voltage source
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HANDHELD
PRECISION DIGITAL VOLTAGE SOURCE
Model PDVS2mini
A multitude of uses as a calibrator, reference and
fully adjustable precision voltage source.
Handmade in Great Britain by Ian Johnston
Manual Version 1.0 (19/10/19)
Ian Johnston Engineering Ltd. | www.ianjohnston.com | ian@ianj.net

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Summary of Contents for Ian Johnston Engineering PDVS2mini

  • Page 1 HANDHELD PRECISION DIGITAL VOLTAGE SOURCE Model PDVS2mini A multitude of uses as a calibrator, reference and fully adjustable precision voltage source. Handmade in Great Britain by Ian Johnston Manual Version 1.0 (19/10/19) Ian Johnston Engineering Ltd. | www.ianjohnston.com | ian@ianj.net...
  • Page 2 INDEX FUNCTIONS & FEATURES SPECIFICATION SUMMARY OPERATION OF INSTRUMENT MAIN COMMS SETTINGS CALIBRATION FIRMWARE UPGRADE 9, 10 WINDOWS PC APPLICATION HARDWARE FREQUENTLY ASKED QUESTIONS PRODUCT DISCLAIMER & WARRANTY CE CERTIFICATE & DECLARATION CALIBRATION RECORD (BLANK) The screenshots & photos in this manual may not necessarily 100% reflect the actual hardware and/or firmware version and are as a guide only.

  • Page 3: Functions And Features

    FUNCTIONS & FEATURES  True 0 Vdc to 10 Vdc user adjustable output (5d.p’s, approx. 10uV steps)  Voltage setting via up/down pcb pushbuttons  Soft power switch  Based on the industry standard LM399AH (0.5 ppm/degC) voltage reference  All digital calibration, no internal potentiometers ...
  • Page 4 The batteries are charged in-place using the DC socket on the top. The PDVS2mini must be powered up for charging to take place. This is so the PDVS2mini can actively monitor the charging process. The batteries won’t charge with the PDVS2mini turned off.
  • Page 5 ……cont. When the batteries are fully charged charging is auto-disabled. To re-enable this unplug the external DC input and reconnect it, or re-enable “Charge Enable” under Settings. This is to help avoid trickle charging the Lithium-Ion batteries. MANUALLY DISABLE CHARGING: To run the unit off external DC power but without charging the batteries turn off charging via the SETTINGS menu.
  • Page 6 MAIN Setting an output: Use the LEFT & RIGHT buttons to select the digit you want to change then press the UP or DOWN to change the digit. The digit selected is indicated with an underscore underneath. Output Protection: The voltage monitor detects when the output has been overloaded or subject to a short circuit.
  • Page 7 Format to PC VR0,0,12345 Format from PC <KeyVoltage, 0, 1.23456> The following details all the data being sent from the PDVS2mini, and only a partial listing of the data from the PC. PDVS2mini OUTPUTS TO PC: KV,0, Output Voltage of PDVS2mini...
  • Page 8 Use the ENTER button to advance through the various entries, and the other buttons to make changes. See the Calibration record as supplied with your PDVS2mini for the original factory settings. Any changes to settings are saved to EEprom.
  • Page 9 HOLD RIGHT/LEFT - 1000 count modify for DAC, 100 count for all else See the Calibration record as supplied with your PDVS2mini for the original factory settings. Any changes to settings are saved to EEprom. Note: If you decide to make any adjustments to the above settings/calibration then please record the...
  • Page 10 The upgrade process I have tested with Win7 & Win10 only, however I cannot guarantee it will work for you. If the process fails your PDVS2mini may become inoperable until you are able complete the upgrade process successfully. Important: You do this at your own risk.
  • Page 11 Connect the AVR Dragon to a USB port of your PC. On the PDVS2mini bridge J1 (this selects 3.3V for ICSP). It is bridged by default. On PDVS2mini (fresh batteries only, do NOT use DC power) fit a jumper to JP1 power bypass, the PDVS2mini will power up.
  • Page 12 TTL-USB comms adaptor. See page 6 (COMMS). Operation: - Download the zip file containing the install files for the PDVS2mini app. Extract the files to a folder on your PC then double click on SETUP.EXE. Follow the on-screen prompts to install the app.
  • Page 13 HARDWARE The following relate to items on the Pcb (printed circuit board): FUSE 1 1A time delay fuse (Schurter UMZ 250 series). 3.3Vdc supply to ICSP header. Default = shorted. ICSP In Circuit Serial Programming header, used for uploading new firmware. Linking this bypasses the (soft) power switch.

  • Page 14: Frequently Asked Questions

    PDVS2mini that it suddenly stops charging and the charge current drops to 0mA. To fix this, remove the batteries from the PDVS2mini and charge them separately in a standalone charger. This will match them again and you can return them to the PDVS2mini.
  • Page 15 Customer's exclusive remedy under this Limited Warranty shall be the repair or replacement, at Company's sole option, of the Product, or any part of the Product, determined by Ian Johnston Engineering Ltd to be defective. In order to exercise its warranty rights, Customer must notify Company.
  • Page 17 PDVS2mini – TEST / CALIBRATION RECORD FUNCTION COUNTS VOLTAGE OUTPUT 0.00000 1.00000 2.00000 3.00000 4.00000 5.00000 6.00000 7.00000 8.00000 9.00000 10.00000 FUNCTION COUNTS Out.Vdc Batt.Vdc Charge mA Batt.Low Shutdown Charge Enable Charge Overload mA Charge Full mA TEST Serial Comms...