1. Extensive electronic measurement instruments
Measurement of the wave shape of the telecommunications signal (voltage versus time relationship)
3. Parameters such as range, periodicity, frequency and phase of measurement
4. In conjunction with sensors, measure all parameters that can be converted to voltage (e. G. Current, resistance, temperature magnetism, etc.)
Ii. Rationale
1. Composition:
Electronic deflection: electronics are subject to electric field power in a horizontal/vertical direction。
E-scanning: sawn cortex volts on the horizontal deflector plate, electronic beams cyclically sweep in horizontal direction, and horizontal light on screens called "scanning"。
Scan by auto/norm。
Wave display principle: uy on the y-rotation plate, and ux on the x-rotation plate, allowing electrons to move in the y direction by the sine and evenly in the x direction. If tx=nty. And there's a steady sine wave on the screen. Trigger sync: the wave shape on the screen can be stabilized only if tx is several times the integer of ty。
In order to achieve a stable wave shape, trigger sync can be used: i. E., a part of the signal is introduced from the trigger source (e. G., the y-axis voltage) to control the sawn-tooth generator, and tx=nty is mandatory。
Sync: select the trigger source - trigger level。
Double-trace display: the two signal wave shapes of channels 1 (ch1) and 2 (ch2) are rotated using electronic switches。
Channel selected: ch1, ch2, ch1+ch2, ch1-ch2
Select display: alternating (alt)/interrupted (chop)
Lisa rutu, measuring the frequency of signals
Adding two sine signals to the input end of the x-axis (ch1) and y-axis (ch2) respectively, the motion track of the light point on the screen is a synthesis of two vertical vibrations. When the frequency ratio of the two sines is integer, the trajectory is a stable closed curve. This curve is referred to as leeza, as shown in figures 3-6。
Iii. Methods of use of oscillators
1. Panel
Use methods
1) select the scanning method (sweep mode): auto to generate horizontal light when no signal is entered. (normal/single)。
The buttons are in the middle: the usual buttons, such as “inten” (wave brightness), “read out” (char brightness) and “positon” (vertical shift), “←→positon” (horizontal shift), are in the middle。
2) channel selection: ch1/ch2
Select display method: alt exchange (ac) coupling: generally, press dc/ac keys to make ch1 and ch2 input signal coupling an ac。
3) sync
Select the trigger source (source): press the source (trigger source)-vert (vertical) trigger so that a stable wave-shaped display can be obtained regardless of whether the signal is entered from ch1 or ch2。
Exchange (ac) coupling: press the couple key to trigger a signal coupling to the ac。
Twisted stability: trig level (trigger level)
4) resize
The x-axis "time/div (scan rate) " spiral is adjusted to show 1-2 periodic waves in the x-ray direction。
The y-axis “volts/div (distortion factor)” spiral is regulated, resulting in a peak of 3-5 cells for the y-direction signal。
The oscilloscope uses a summary:
Scan - channel - show - trigger - sync
Oral: auto (auto) scans-centres-communicating (ac) coupling-vertitudinal (vert) trigger-trading。
3. Measurement of signal ranges, periodicity (frequency) and phase
1) “language measurements” - basic methods
Peak upp = y(cm) x deviation factor k (v/cm)
Exchange validity:
Periodic t=x(cm)x scan speed p(ms/cm)
Frequency f=1/t (hz)
Phase = x (cm) x 3600/xt
2) "radiometry" - most oscilloscopes do not
The phase differential of the two-frequency voltage is measured using the "two-trace function"。
Phase difference: =d(div)x2π/dt
(2) "radiometry" - most oscilloscopes do not have this function。
