Applicable Model: 820
The external power adapter, model BC 28, that may be used to supply power to the B&K Precision 820 capacitance meter is specified by the illustration below. It supplies a 6V DC output, with maximum output current at 300 mA. The size of the tip is 3.2mm, and the outer part (contact away from the tip) has negative polarity while the tip has positive polarity.
A comparable adapter with same type and output specifications may be used. Please use the illustration for reference.