Circuits & Schematics Measurement: oscilloscope - 3

21. Test Setup Checks Transistors' hFEs When Tight Control Is Important
    Circuits Measurement
    .. test current to the DUT. U2 then raises V CE(DUT) to 2 V and regulates it. Figure 3. The falling edge of Q A triggers an oscilloscope, which uses V RB1 (trace A) and V RC1 (trace B) to calculate h FE (trace D). The high-to-low ...
    31-05-2016

22. Transient load gives power systems a workout
    Circuits Measurement Power Linear Technology LT1935ES5
    .. high bandwidth means for measuring the pulsing current. A straight 50 Ω coax can be connected directly to an oscilloscope input for monitoring current with a scale of 1 mV/A. The voltage measurement should also be made ...
    04-11-2015

23. High-impedance FET probe extends RF-spectrum analyzer's usable range
    Circuits Analogue Design Measurement Texas Instruments OPA656
    .. an alternative: an inexpensive and well-protected unity-gain probe that presents the same input impedance as a basic bench oscilloscope and can drive the spectrum analyzer's 50 Ω input impedance. The probe has a gain of 0 ...
    14-02-2016
24. Build your own bypass-capacitor tester
    Circuits Analogue Design Measurement Fairchild PN2222A 2N3904 2N3906
    .. are as short as possible and as close as possible to the copper-clad board. The layout is such that you don't need the oscilloscope probe's ground lead; the ground on the probe contacts a ground post on the pc board. The ...
    01-12-2016
25. Simple circuit turns scope, function generator into JFET curve tracer
    Circuits Measurement Texas Instruments LM358
    .. existed for decades. But designers without access to one can create a simple circuit that uses a function generator and oscilloscope to generate JFET transfer and characteristic curves. The circuit can also be computer-driven, ...
    20-06-2018
26. 1-Hz to 100-MHz VFC features 160-dB dynamic range
    Circuits Measurement Linear Technology LT1460 LTC1150 LTC6943
    .. C 1 resets IC 2A 's output to its high state, and the ramp-and-reset action continues. Figure 2. On a 700-MHz real-time oscilloscope, the oscillator-core waveforms at a 40-MHz operating frequency show the ramp-and-reset waveform ...
    19-01-2017
27. Power Meter is ±1% Accurate
    Circuits Measurement Maxim MAX427 MAX4372
    .. offset adjustment : Connect a 1-kHz, 5 V p-p sinusoidal signal to the Y input, and connect the X input to ground. Using an oscilloscope to monitor the output, adjust R X for an ac null (zero amplitude) in the sinusoidal signal. ...
    31-05-2017
28. Passive circuit monitors AES data
    Circuits Audio Measurement
    .. ground by using signal transformers or capacitors. Several other data-transmission standards use a similar data format. An oscilloscope does not reliably trigger on such a waveform; thus, troubleshooting and signal tracing such ...
    10-05-2018
29. High-speed op amp enables IR-proximity sensing
    Circuits Analogue Design Measurement Everlight IR11-21C PD15-22C
    .. at three nodes for objects at 1.2 and 1.4 in. from the IR transceiver. The circled numbers in Figure 2 refer to the oscilloscope traces in Figure 3. Materials on the topic Datasheet Everlight IR11-21C Datasheet Everlight ...
    30-09-2020
30. Circuit folds back current during fault conditions
    Circuits Measurement Supply Microchip LM4041 MIC5159 MIC7221
    .. limit re-engages. Figure 2. The circuit in Figure 1 cycles current in the event of a fault condition. Figure 2 is an oscilloscope photo of this circuit in operation. This cycling of current, although periodically delivering ...
    03-11-2021

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