Ian Johnston Engineering PDVS2mini, Manual

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FUNCTIONS & FEATURES
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True 0 Vdc to 10 Vdc user adjustable output (5d.p’s, approx. 10uV steps)
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Voltage setting via up/down pcb pushbuttons
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Soft power switch
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Based on the industry standard LM399AH (0.5 ppm/degC) voltage reference
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All digital calibration, no internal potentiometers
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20bit DAC with an accuracy/stability down in the uV’s (using a PLC filter of 1.0 or higher)
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Battery voltage monitor, including low voltage warning, auto-shutdown and charging status
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Output voltage monitor including short circuit protection
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2.4” Graphics Monochrome LCD (128x64 pixels)
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Atmel Atmega1284 micro-controller (uses Arduino bootloader)
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Precision chopper op-amp on final output with extra stability achieved using low tempco resistors
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Re-calibration by the user possible, and saved to flash rom
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Charging pcb/socket for Li-ion batteries using a battery management IC. Batteries and DC adaptor are not
supplied
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Battery reverse polarity protection
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ABS Hammond enclosure
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Manual including factory calibration/settings test record. Unique serial number
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CE approved
SPECIFICATION SUMMARY
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Voltage reference = Uses an LM399AH (0.5 - 1 ppm/degC temperature coefficient)
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0.00000 Vdc to 10.00000 Vdc in 10 uV (0.00001 Vdc) steps
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Load = 3kohm minimum. Example: At 10Vdc output with 3kohm load = 3.3mA (whilst maintaining output
within approx. 10uV)
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Accuracy = Within 100uV. Typically 0.001% at 10V output
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Stability = 0.0001Vdc typical variation. Orientation of the unit may effect output (calibrated horizontally), as will
powering from external DC
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Temperature coefficient (unit) = Typically < 3 ppm across a 10degC temperature change (see product
webpage for tempco test)
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Drift (12 months typical) = tba - SPEC TO BE CONFIRMED
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Stabilization time = 10mins to 1hr depending on ambient temperature, coming off battery charge and last use
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Output short circuit = indefinite (20mA)
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Power (batteries) = Two Lithium-Ion re-chargeable 9V PP3 batteries (Not supplied, 600mAh batteries
recommended)
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Power (external power) = 18 to 24Vdc input (also charges the batteries) @ 400mA min recommended

Battery consumption = 100mA approx. at power up, reducing to 50mA approx. when LM399AH heater has
stabilized (a few minutes)
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Battery quiescent current (unit switched off) = 4uA approx.
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Battery = Approx. 12hrs (EBL 600mAh re-chargeable batteries) typical continuous operation
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Dimensions = 106mm x 66mm x 47mm
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Contains 3D printed & laser cut parts.