The oscilloscope probe is critical to the accuracy and correctness of the measurement. It is the electronic component that connects the circuit under test to the input of the oscilloscope. The simplest probe is a wire that connects the circuit under test to the input of an electronic oscilloscope. The complex probe consists of a RC component and an active device. A simple probe does not take shielding measures and is easily interfered by external electromagnetic fields, and its own equivalent capacitance is large, causing the load of the circuit under test to increase, and the signal to be measured is distorted. This article introduces the active single-ended probe.
Active single-ended probe principleActive single-ended probes typically have high impedance (1 MΩ up and down) and low parasitic capacitance. The front end has a high-bandwidth amplifier, and the active probe is powered primarily for this amplifier. The amplifier drive signal reaches the oscilloscope through a 50Ω transmission line, and the input impedance of the oscilloscope needs to be matched to 50Ω. Due to its low parasitic capacitance and 50 ohm transmission, active single-ended probes offer higher bandwidth than passive probes and are therefore used primarily in the measurement of high frequency signals.
Active single-ended probe schematic
Advantages and disadvantages of active single-ended probesThe advantages and disadvantages are often coexisting, as are active single-ended probes. The ability to measure higher bandwidth signals is an advantage, but because of the need to integrate active amplifiers, the cost is higher than that of passive probes, and an active single-ended probe with a bandwidth of several GHz can cost tens of thousands of renminbi. In addition, because the signal input range of the high-bandwidth amplifier is very limited, its dynamic range is limited. Generally, the dynamic range of the active single-ended probe is only within a few volts, and the maximum voltage that the probe can withstand is only a few dozen. Volt. Active single-ended probes can also be used in measurement environments with low impedance and high frequency signals, and because their input impedance is higher than passive transmission line probes, their load effects are smaller. Not only that, R&S active single-ended probes can also be connected to RT-ZA9 (N-type adapters, USB-powered) accessories for use in RF signal sources and spectrum analyzers to test signals in special environments, such as traditional When the 50 ohm coaxial cable cannot be connected to the probe point, or when a high-impedance probe is needed to detect the signal spectrum of the signal to be measured.
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