Ian Johnston Engineering PDVS2, Руководство пользователя

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2
FUNCTIONS & FEATURES

True 0 Vdc to 10 Vdc user adjustable output in 10 V mo
de (4d.p’s effective, 38.146uV).

A 2nd mode offering 0.01 Vdc to 2.0 Vdc user adjustable output (5d.p’s effective, 10 uV).

Voltage setting or ramp up/down controls via the 12 button numeric keypad.

Digital Rotary Encoder (potentiometer) allowing quick, on the fly adjustments of the output voltage.

LED backlighting (auto-limiting).

Soft power switch.

Based on the industry standard LM399AH voltage reference.

All digital calibration, no internal potentiometers.

18bit DAC with an accur
acy/stability down in the uV’s.

Battery voltage monitor, including low voltage warning, charging status and auto-shutdown.

Output voltage monitor including overload / short circuit protection.

3” Graphics Monochrome LCD (128x64 pixels).

Atmel Atmega1284 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.

On-board charging for Li-ion batteries (batteries and DC adaptor not supplied).

Battery & DC input reverse polarity protection.

Quality Hammond 1599 case.

Quality aluminium anodized & engraved front panel.

Quality 4mm banana sockets.

Calibration/Settings test record supplied, unique serial number.

Software function- PLAYBACK mode.

Software function- RAMP mode.

Software function- Remote Operation via Windows app (via USB port).

CE Approved.
SPECIFICATION SUMMARY

Voltage reference = LM399AH (0.5 - 1 ppm/degC temperature coefficient).
10V mode = 0.0000Vdc (true zero) to 10.0000Vdc in 38.146uV steps (minimum).
2V mode = 0.01000Vdc to 2.00000Vdc in 10uV steps (minimum).

Load = 3kohm minimum. Example: At 10Vdc output with 3kohm load = 3.3mA (whilst maintaining output
within approx. 10uV).

Accuracy = 0.001% (within 100uV).

Stability = 0.0001Vdc variation max. 10V mode, 0.00004Vdc typical variation in 2V mode.

Drift (long term) = This has not been characterized.

Temperature coefficient (output voltage) = Less than 1 ppm/degC (11.5degC tested variation).

Stabilization time = typically 10mins when stored at approx. 23degC.

Output short circuit = indefinite.

Power Source (batteries) = Two Lithium-Ion/Lipo re-chargeable 9V PP3 batteries (600mAh min. batteries
recommended). Batteries must be match charged prior to use and capable of 250mA charge current.

Power Source (external power) = 18 to 24Vdc input (also charges the batteries) @ 400mA recommended.

Battery life = Approx. 12hrs (using EBL 600mAh batteries) typical continuous operation with backlighting off.

Current drain = ~45mA after the LM399AH reference stabilizes & backlighting turned off.

Dimensions = 158mm x 83mm x 35mm (case size).