1. What is a graphical tester for spectrum analyzer to analyze signals in the frequency domain. Graphically displays the distribution of signal amplitude according to frequency, that is, the X-axis represents the frequency, and the Y-axis represents the signal amplitude. 2. Principle: Use a narrowband bandpass filter to gate the signal. 3. Main function: display the spectrum, amplitude and frequency of the signal under test. It can be displayed in a panoramic view, or you can select a graphical tester with a spectrum analyzer that analyzes the signal in the frequency domain. Graphically displays the distribution of signal amplitude according to frequency, that is, the X-axis represents the frequency, and the Y-axis represents the signal amplitude. 2. Principle: Use a narrowband bandpass filter to gate the signal. 3. Main function: display the spectrum, amplitude and frequency of the signal under test. It can be displayed in a panoramic view, or a bandwidth test can be selected. 4. Measurement mechanism: 1. Compare the measured signal with the reference frequency and reference level in the instrument. Because many measurements are essentially level tests, such as carrier level, A/V, frequency response, C/N, CSO, CTB, HM, CM, and average power of digital channels. 2. Waveform analysis: Analyze the line waveform of the TV through the 107 option and the corresponding analysis software to test the video index. Such as DG, DP, CLDI, modulation depth, frequency offset, etc. 5. Operation: (1) Hard keys, soft keys and knobs: These are the basic operation methods of the instrument. 1. Three big hard keys and one big knob: The function of the big knob is set by three big hard keys. Press the frequency hard key, the knob can fine-tune the center frequency displayed by the instrument; press the sweep width hard key, the knob can adjust the frequency width of the instrument sweep; press the amplitude hard key, the knob can adjust the signal amplitude. When you turn the knob, the center frequency, sweep width (start, stop frequency), and amplitude in dB are displayed on the screen at the same time. 2. Soft keys: On the right side of the screen, there is a row of unmarked keys arranged vertically. Its function varies with the item. What is displayed on the right side of the screen corresponding to the key is the key. 3. Other hard keys: There are ten hard keys in the INSTRUMNT STATE control area: RESET reset, CANFIG configuration, CAL calibration, AUX CTRL auxiliary control, COPY printing, MODE mode, SAVE storage, RECALL recall, MEAS/USER Measurement/user-defined, SGL SWP signal scanning. There are four hard keys in the MARKER area: MKR cursor, MKR cursor movement, RKR FCTN cursor function, PEAK SEARCH peak search. There are six hard keys in the control (CONTRL) area: SWEEP scan, BW bandwidth, TRIG trigger, AUTO COVPLE automatic coupling, TRACE tracking, DISPLAY display. There is a BKSP back in the numeric keypad. On the right side of the numeric keypad is a vertical row of four ENTER keys, which are also unit keys. The three hard keys above the large knob are window keys: ON, NEXT, and ZOOM. The two keys with arrows, STEP under the big knob, can be used to adjust up and down in conjunction with the big knob. (2) Input and output ports: located in a row under the same panel. TV IN signal input port for measuring video indicators; VOL INTEN is a set of internal and external knobs to control and adjust the volume and screen brightness of the built-in speaker; CAL OUT instrument self-test signal output; 300Mhz 29dBmv instrument standard signal output port; PROBE PWR instrument probe power supply ; IN 75Ω1M—1.8G test signal total input port. (3) Test preparation: 1. Restrictive protection: stipulate the highest input radio frequency level and the highest voltage value that can cause permanent damage: DC 25V, AC peak-to-peak value 100V. 2. Warm-up: The test must wait until the OVER COLD disappears. 3. Self-calibration: use for three months, or before important measurement
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