Capacitance Measurements - Keithley DMM7510 Reference Manual

Section 2: General operation Model DMM7510 7½ Digit Graphical Sampling Multimeter Reference Manual

Capacitance measurements

With a Model DMM7510, you can measure capacitance.
The capacitance function sources a constant I current through the device under test (DUT) while
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measuring voltage (dV) in a fixed time internal (dt). The Capacitance measurement is:
I * dt / dV
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Capacitance measurements have two measurement phases, discharge and charge. During the
discharge phase, the DUT is connected through an internal 13 mA current source and discharged to
approximately 0 V. In the charge phase, the I is sourced while measuring the voltage. If the voltage
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on the DUT exceeds 2.8 V ±10 %, the I is halted and the voltage is held until the discharge phase.
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If the voltage is less than 2.8 V, the resultant capacitance measurement is calculated.
Capacitance supports 1 nF to 1 mF ranges. Each range measures from 0 % to 120 % full scale.
Reading rates vary based on range and the percent of full scale.
The 13 mA discharge and I currents are protected to 1000 V.
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Capacitance has a fixed aperture time.
Do not apply more than 1000 V between INPUT HI and LO. Failure to observe this caution may
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result in instrument damage.
Capacitance measure connections
Figure 86: Front panel connections: Capacitor measurement
2-122 DMM7510-901-01 Rev. B / May 2015