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A compact 45 kV curve tracer with picoampere current measurement capability
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View: Figures


Image of FIG. 1.
FIG. 1.

Curve tracer system block diagram. The curve tracer features a PIC18F47J53 microcontroller, USB 2.0 communication to a host PC, an LTC2634 DAC for driving an external high voltage dc power supply, DUT voltage measurement, and two DUT current measurement circuits.

Image of FIG. 2.
FIG. 2.

Circuit to drive the external high voltage power supply (Spellman High Voltage SL100PN300).

Image of FIG. 3.
FIG. 3.

DUT's high voltage measurement circuit.

Image of FIG. 4.
FIG. 4.

DUT's internal parallel switched resistor current measurement circuit.

Image of FIG. 5.
FIG. 5.

Circuit used to connect the PocketPico to the curve tracer and measure the DUT's current. 20,21

Image of FIG. 6.
FIG. 6.

High voltage curve tracer board showing the DUT-High, DUT-Low, and HV-In connections. The board is 22.8 cm × 27.9 cm and located on 6.35 cm tall spacers on an insulating HDPE sheet.

Image of FIG. 7.
FIG. 7.

Block diagram of the C# software and its operation. The GUI runs on the main program's thread while an asynchronous thread handles the USB read/write operations to prevent the GUI and IV chart from becoming unresponsive during data transfers.

Image of FIG. 8.
FIG. 8.

Comparison of the leakage current of a low voltage SiC PCSS tested up to 3.5 kV measured with the internal ammeter and the PocketPico ammeter.

Image of FIG. 9.
FIG. 9.

Leakage current of a high voltage SiC PCSS and a ceramic high voltage capacitor tested up to 45 kV. Also shown is the leakage current of a 0.6 m long piece of RG-218 (11 kV rms rating) high voltage coaxial cable tested up to 20 kV. All data were taken at room temperature using the PocketPico ammeter integrated into the curve tracer.


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Scitation: A compact 45 kV curve tracer with picoampere current measurement capability