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A SIMPLE METHOD FOR MEASURING THE OUTPUT RESISTENCE AND OUTPUT CAPACITANCE A PULSE GENERATOR IN SMALL SIGNAL MODE
08.06.2022 15:40
[3. Технические науки]
Автор: Bozhko K. M., National Technical University of Ukraine “Igor Sikorsky Kyiv Polytechnic Institute”, Kyiv; Melkumov A. M., National Technical University of Ukraine “Igor Sikorsky Kyiv Polytechnic Institute”, Kyiv
When measuring the capacitance of a cable segment, it becomes possible to determine the output parameters of the pulse signal source. The capacitance of the cable segment is determine with an E7-14 type device. For a twisted pair cable 1m long, the capacitance is 40.2 pF. The measurement error in this case was 0.1%. To determine the output parameters of the pulse generator, the measurements are twice: the first time without a cable, the second time – with a cable segment (Fig. 1).
Figure 1. – The measuring stand
A G3-111 generator and a TEKTRONIX TDS1002 digital oscilloscope used in the measuring stand. With a direct connection of the oscilloscope probe to the generator output, of a pulsed symmetrical signal with a frequency of 2 MHz and an amplitude of 100 mV is measured (Fig. 2). This amplitude value is the minimum for this generator.
Figure 2. – Signal without a cable
The signal increases exponentially with a negative exponent. The time constant τ = RC is 15 ±0.75 ns. R and C is the output resistance and capacitance of the generator.
When a cable is connected, the capacitance increases by 40.2 pF. The signal front becomes flatter (Fig. 3). The time constant increases to 25 ±0.75 ns.
Figure 3. – Shunt effect: signal a cable 1m long with capacitance 182 pF
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