Abstract
This paper presents a new method for the cut-off frequency measurement of a picoammeter. The discharged current flows through the recommended picoammeter, when the charged condenser in constant voltage is connected to the picoammeter under test. The output voltage during the discharging process is amplified by use of a logalithmic amplifier, and displayed on the C.R.T. A reading of the cut-off frequency provides by the template, which is attached on a C.R.T. oscilloscope. The cut-off frequency can be measured in the range of 0.01Hz∼10kHz with conventional C.R.T, oscilloscope. The method has errors less than 10%.
