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SETTINGS 

 

 

 

 

 

 

User adjustable settings: 

Batt Low Indication.   

Battery voltage at which the unit displays BATTERY LOW. 

Batt Low Shutdown   

Battery voltage at which the unit will auto-shutdown. 

Charge Enable 

Enable / disable battery charging. 

This setting is useful when an external DC source is used but the user 
doesn’t want the batteries to charge. 

Charge Overload mA 

Charge overload current setting. 

The charging circuit is self-contained, but as a safety setting to protect the 
batteries & electronics if the charge current goes too high (a faulty battery 
perhaps). The charging will be shutdown. 
The maximum current should be approx. 250mA, so the default setting here 
of 400mA gives some margin. 

Charge Full mA 

Current (mA) at which the battery is determined to be near full. 

The charging circuit is self-contained, but as an added extra the software can 
shutdown charging if the battery is approaching near full capacity. This is 
done by monitoring the charge current and if it drops below a specific level 
then the charger is shutdown. 

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. 
 
Note: If you decide to make any adjustments to the above settings then please record the original settings 
before you start.

 

 

Summary of Contents for PDVS2mini

Page 1: ...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 Engineer...

Page 2: ...FIRMWARE UPGRADE 9 10 WINDOWS PC APPLICATION 11 HARDWARE 12 FREQUENTLY ASKED QUESTIONS 13 PRODUCT DISCLAIMER WARRANTY 14 CE CERTIFICATE DECLARATION 15 CALIBRATION RECORD BLANK 16 The screenshots phot...

Page 3: ...oltage reference Uses an LM399AH 0 5 1 ppm degC temperature coefficient 0 00000 Vdc to 10 00000 Vdc in 10 uV 0 00001 Vdc steps Load 3kohm minimum Example At 10Vdc output with 3kohm load 3 3mA whilst m...

Page 4: ...is the batteries The best performance of the unit is when the batteries are being used to supply power without any external power External DC input cable wiring Red Blk The battery terminals and the e...

Page 5: ...n off charging via the SETTINGS menu Without this you may get OVER on the display Please observe the minimum external DC supply voltage NOTES When running with batteries and also an external DC input...

Page 6: ...l Best Stability For the most accurate and stable output it is highly recommended to run the unit from the batteries with no external DC power input This helps avoids any ground loop noise entering th...

Page 7: ...col BAUD 250k N 8 1 Rate Data from PDVS2mini to PC is sent every 100mS 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...

Page 8: ...imum current should be approx 250mA so the default setting here of 400mA gives some margin Charge Full mA Current mA at which the battery is determined to be near full The charging circuit is self con...

Page 9: ...10 00000 XXXXXXX Counts for 10 00000Vdc output Out Vdc XX X XXXX Output monitor counts Calibration of the output DC voltage monitor Batt DC Vdc XX X XXXX Battery Ext power supply Vdc Span counts Cali...

Page 10: ...le co uk avrdudess a gui for avrdude A HEX file will be supplied for the upgrade The current calibration settings will not be overwritten but it is advisable to have them written down Please refer to...

Page 11: ...oth ends type from the PDVS2mini ICSP header to the AVR Dragon ISP header note orientation and pin1 On Atmel Studio Select AVR DRAGON ATmega1284 ISP then hit APPLY The PDVS2mini will be interrogated y...

Page 12: ...PC then double click on SETUP EXE Follow the on screen prompts to install the app If the app install fails then see below Turn on COMMS on the PDVS2mini by holding down the LEFT RIGHT buttons Start th...

Page 13: ...e Pcb printed circuit board FUSE 1 1A time delay fuse Schurter UMZ 250 series J1 3 3Vdc supply to ICSP header Default shorted ICSP In Circuit Serial Programming header used for uploading new firmware...

Page 14: ...d charge them separately in a standalone charger This will match them again and you can return them to the PDVS2mini If this problem persists then you may have a faulty weak battery Q Can I run the PD...

Page 15: ...product may directly threaten life or injury The user of Ian Johnston Engineering Ltd products in life support aircraft applications or other such critical activities assumes all risks of such use an...

Page 16: ...15...

Page 17: ...00 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 Soak Test Dur...

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