Boonton 72C Analog Capacitance Meter

The Boonton 72C, 100 kHz analog meter is recommended for series capacitance measurements on very low capacitance junctions where normal series loss can cause the Q of the junction capacitance to fall well below 10 at 1 MHz. In this instance, using 72C takes advantage of the fact that the Q of the cpacitor with series loss is inversely proportional to frequency and therefore ten times higher at 100 kHz then at to 1 MHz.