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I take a look at the Precision Digital Voltage Source by Ian Johnston.

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Learn more about it here:
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FUNCTIONS & FEATURES:-

PDF version of the latest manual here.

- 50mV to 10Vdc user adjustable output (4d.p’s, 5d.p’s extended, i.e. 10’s of uV’s).
- Voltage setting or ramp up/down controls via the 12 button numeric keypad.
- Soft power switch.
- Based on the industry standard LM399AH (0.5 ppm/degC) voltage reference.
- No potentiometers inside or outside.
- 18bit DAC with an accuracy/stability down in the tens of uV’s (using a PLC filter of 1.0 or higher).
- Battery voltage monitor, including low voltage warning and auto-shutdown.
- Output voltage monitor including overload / short circuit protection.
- 3” Graphics LCD (128x64 pixels).
- Atmel 328P micro-controller (uses Arduino bootloader).
- Precision chopper op-amp on final output with extra stability achieved using low tempco resistors.
- Re-calibration by the user possible via keypad/LCD and saved to flash rom.
- Battery powered.
- Battery reverse polarity protection.
- Quality Hammond 1599 case.
- Quality aluminium anodized & engraved front panel.
- Quality 4mm banana sockets.
- Single PCB integrating the analog & digital electronics, LCD, keypad & battery terminals.
- Printed manual including factory calibration/settings record supplied. Unique serial number.
- NEW: Latest software V1.2 includes PLAYBACK mode.

Prior to shipping each unit:

- Hardware assembled and powered-up/tested using a strict procedure.
- Test point check at various places around the circuit for compliance.
- LM399AH aged/burned-in for 48hrs in unit, including numerous power cycles.
- Calibrated against a Keysight 34461a 6.5 digit multimeter (with current calibration certificate).
- Output load tested.
- Calibrated at approx. 23degC ambient.
- Unique serial number assigned.
- Calibration/setting record generated.

SPECIFICATION SUMMARY:-

- Voltage reference IC = LM399AH (0.5 - 1 ppm/degC temperature coefficient).
- Range = 0.05Vdc (50mV) to 10.0Vdc in 38.146uV steps (minimum).
- Load = 5mA (whilst maintaining output within approx. 10uV).
- Accuracy = 0.001% (within 100uV & using a PLC filter of 1.0 or higher).
- Stability = 0.0001Vdc variation max. 4d.p. mode.
Stability = 0.00004Vdc typical variation in extended 5d.p. mode.
- Temperature coefficient (output voltage) = Less than 1 ppm/degC (tested across a temperature variation of 11.5degC - See the project page here for more info).
- Stabilization time = typically 10mins when stored at approx. 23degC. Can be quicker, or longer depending on ambient and storage conditions.
- Output short circuit = indefinite.
- Power Source = Two 9V PP3 batteries.
- Battery life = 14hrs (600mAh batteries) typical continuous operation.
- Current drain = 40mA (after LM399AH stabilizes).
- Dimensions = 158mm x 83mm x 35mm (case size).



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