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……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. 

 
RUNNING WITHOUT BATTERIES FITTED: 
To run the unit without any batteries fitted then turn 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 the higher voltage of the 
two is used to power the unit. Highest voltage wins. 

Most Lithium-Ion PP3 batteries have a built in protection circuit and can shut 
themselves down if over-discharged. Brands can differ so you may have to adjust the 
low battery warning and auto-shutdown voltages accordingly. 

On disconnecting the ext. DC socket after fully charging the batteries the battery 
voltage should display approx. 16.8Vdc. This is two 8.4V PP3 Li-ion batteries in 
series.

 

 

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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