The oscilloscope also has some more complex functions, such as delayed sweep, trigger delay, XY mode, etc., which are not introduced here. Getting started with an oscilloscope is easy, and a Fluke-based handheld oscilloscope is really proficient in the application. It is worth pointing out that although the oscilloscope has many functions, it is better to use other instruments and instruments in many cases. For example, in a digital circuit experiment, it is much simpler to use a logic pen to determine whether a single pulse with a narrow pulse width occurs. When measuring a single pulse width, it is better to use a logic analyzer. 1. Obtain a baseline: When an operator uses an oscilloscope without a manual, first obtain a finest horizontal baseline before using the probe for other measurements, as follows:

(1) Preset panel switches and knobs.

When the brightness is set, the focus and auxiliary focus are moderate. The vertical input coupling is set to “AC,,, the vertical voltage range is set to “5mv/div”, the vertical operation mode is set to “CHl”, and the vertical sensitivity fine adjustment calibration position is set to “CAL”. The vertical channel synchronization source selects the middle position, the vertical position is set to the middle position, the A and B scan time factors are preset together at "0.5ms/div", the A scan time is fine-tuned to set the calibration position "CAL", and the horizontal displacement is set to the middle position. The scan mode is set to "A", the trigger synchronization mode is set to "AUTO", the slope switch is set to "+", the trigger coupling switch is set to "AC", and the trigger source is set to "INT".

(2) Press the power switch and the power indicator will light.

(3) Adjust the A-brightness focus and other related control knobs, and the slim and bright scan baseline can appear, and the baseline is adjusted so that the position is substantially coincident with the horizontal coordinate scale in the middle of the screen.

(4) Adjusting the trajectory parallelism control makes the baseline parallel to the horizontal coordinates.

2. Display signal: Under normal circumstances, the oscilloscope itself has a 0.5Vp-p standard square wave signal output port. When the baseline is obtained, the probe can be connected here. At this time, the screen should have a series of square wave signals. The voltage range and the scan time factor knob, the amplitude and width of the square wave should be changed. This means that the basic adjustment of the oscilloscope can be put into use.

3. Measurement signal: Connect the test line to the CHl or CH2 input socket, and the test probe touches the test point to observe the waveform on the oscilloscope. If the waveform amplitude is too large or too small, adjust the voltage range knob; if the waveform period display is not suitable, adjust the scan speed knob.

Special use method

1. AC peak voltage measurement

(1) Obtain a baseline.

(2) Adjust the V/div knob so that the waveform displays 5 div in the vertical direction (ie 5 grids).

(3) Adjust the "A trigger level" to obtain a stable display.

(4) Calculate the peak voltage using the following formula.

Voltage (p-p): vertical deflection amplitude / degree x (VOLTS / div) / switching gear pole x probe attenuation ratio.

For example, the upper peak to the lower peak deflection is 5.6 degrees, the VOLTS/dir switch is set to 0.5, and the x10 probe attenuation ratio is used to replace the data: voltage two 5.6X0.5 X 10 two 28 V.

2. Rise time measurement

Rise time: horizontal distance (degrees) x time / degree (gear) / expansion factor.

For example, the distance between two points of the waveform is 5 degrees, the time/degree level is 1Us, and the extension of x10 is extended (ie, x1), and the given value is substituted: I Division when rising; 5X1/1; 51xs.

3. Phase difference measurement

Phase difference: horizontal difference (degrees) x horizontal scale calibration value (degrees/degrees).

For example, the horizontal difference is 0.6 degrees, and each degree is calibrated to 45 degrees. The formula for the given value will be given: phase difference: 0.6x45:27.

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