PDVS 2 Mini v1.6

PDVS 2 Mini v1.6

Precision Digital Voltage Source. The well known and proven PDVS 2 Mini with overhauled design and incremental improvements for v1.6:

• Addition of 2% overrange on Output to 10.22222 V 
• Integrated digital temperature sensor for internal temperature readout with 0.1°C resolution
• Software updated to include 10.22222 V calibration point and temperature readout  via serial connection
  
• Analogue circutiry, main components used and routing remains unchanged from previous versions made by Ian Johnston, all changes to the design made in coordination with Ian
  
  
• All units are calibrated and adjusted with a Keithley 2002 8.5 digit multimeter, last calibration and adjustment done in  October 2024 against 24-hour specifications by xDevs.com. The calibration report is available via the resources tab
  
• Units include full calibration report. See resources tab for sample

Functions and Features: 

• True 0 to 10 V DC user adjustable output in approx. 10 µV steps
• Fully remote controllable via serial connection
• Based on the industry standard LM399AH (0.5 ppm/K) precision shunt voltage reference
• All digital calibration
• 20bit DAC with an accuracy/stability down in the uV’s (using a PLC filter of 1.0 or higher)
  
• Precision chopper op-amp on final output with extra stability achieved using low tempco resistors; output voltage is monitored constantly and includes short circuit protection
• Recalibration and adjustment possible by the user
• Charging PCB with socket for Li-ion batteries using a battery management IC, battery voltage monitor, including low voltage warning, autoshutdown, charging status and battery reverse polarity protection
• 2.4” Graphics Monochrome LCD
• Enclosure custom aluminum CNC machined and anodised
  

Specification Summary

• Voltage reference: LM399AH (0.5 - 1 ppm/K temperature coefficient)
• 0.00000 V to 10.22222 V in 10 µV (0.00001 V) steps
• Load = 10mA max; internally protected against indefinite short circuiting of output
• Accuracy = Within 50uV. Typically 0.0005% at 10V output
• Stability = 0.00005Vdc variation worst case. Orientation of the unit may effect output (calibrated horizontally), as will powering from external DC source
• Temperature coefficient (whole unit) = Typically < 3 ppm across a 10K temperature change 
• INL (Integral Non-Linearity) per DAC datasheet = Typical +/- 1bit, Max./Min. = +/- 64bit across 20bit range; considerably reduced by 12 setpoint calibration system used
  
• Stabilization time: around 20 minutes depending on ambient temperature, coming off battery charge and last use
  
• Power (batteries) = Two Lithium-Ion re-chargeable 9V PP3 batteries (Not supplied, 600mAh batteries recommended)
• Charging (external power)  = 18 to 20V DC. For battery charging, 250mA max. charge current. Uses a 1.4mm barrel jack connector, supplied.
• Battery consumption = ~100mA at power up, reducing to ~50mA when LM399AH heater has stabilized (a few minutes)
• Battery quiescent current (unit switched off) ~4uA.
• Battery = Approx. 12 hours typical continuous operation with recommended EBL 6F22 Li-ion 600mAh batteries . Any rechargeable Lithium-Ion 6F22 batteries will do, ranging from 500mAh to 1000mAh
• Dimensions = 105 x 65x 52 mm

Included Items

• PDVS 2 Mini 
• Charging cable (50 cm) with barrel plug and unterminated end
• Certificate of calibration