The 72C is a capacitance meter from Boonton. Capacitance meters are used to measure discrete capacitors and come in bench and portable varieties.
- Test Frequency: 100 kHz
- Measurement range: 1 pF to 3000 pF full scale
- DC output response time: 1 ms to full accuracy
- 3 terminal measurement
- 0.5% basic accuracy
- ±600 V external bias capability
- Differential inputs
- 15 mV test level
The Boonton 72C is a 100 kHz analog meter and 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 capacitor with series loss is inversely proportional to frequency and therefore ten times higher at 100 kHz then at to 1 MHz.