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CALIBRATION 

 

 

 

 

 

 

 
User adjustable / factory calibration: 

Use the ENTER button to advance through the 11 point output calibration as well as the other 
analogue related calibration, as follows: 

 
Counts: 0.00000 

XXXXXXX 

 

 

Counts for 0.00000Vdc output 

Counts: 1.00000 

XXXXXXX 

 

 

Counts for 1.00000Vdc output 

Counts: 2.00000 

XXXXXXX 

 

 

Counts for 2.00000Vdc output 

Counts: 3.00000 

XXXXXXX 

 

 

Counts for 3.00000Vdc output 

Counts: 4.00000 

XXXXXXX 

 

 

Counts for 4.00000Vdc output 

Counts: 5.00000 

XXXXXXX 

 

 

Counts for 5.00000Vdc output 

Counts: 6.00000 

XXXXXXX 

 

 

Counts for 6.00000Vdc output 

Counts: 7.00000 

XXXXXXX 

 

 

Counts for 7.00000Vdc output 

Counts: 8.00000 

XXXXXXX 

 

 

Counts for 8.00000Vdc output 

Counts: 9.00000 

XXXXXXX 

 

 

Counts for 9.00000Vdc output 

Counts: 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 

Calibration of the Battery & external DC supply 
for the main screen.

 

Charge mA XXX 

XXXX   

 

 

Charge current Span counts 

 

 

 

 

Calibration of the battery charging current monitor. 

Use the menu options as detailed at the bottom of the screen to navigate the various entries, and the other 
buttons to make changes. 

UP/DOWN 

 

1 count modify 

RIGHT/LEFT   

100 count modify for DAC, 10 count for all else 

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 
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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