1. Restrictive protection: stipulate the maximum input radio frequency level and the maximum voltage value causing permanent damage: DC 25V, AC peak 100V.
2. Preheating: The test must wait until OVER COLD disappears.
3. Self-calibration: Self-calibration should be carried out before use for three months or important measurements.
4. System Measurement Configuration: Configuration is to input some parameters of measurement before measurement, eliminating the need to input parameters once for each measurement. Contents: Test items, signal input mode (frequency or channel), display unit, format, noise measurement bandwidth and sampling point, CTB, CSO frequency point, test pass, etc. Configuration steps: Press the MODE key - CABLE TV Analysis YZER soft key - Setup soft key to enter the setting state. Details are tune config tuning configuration: including frequency, channel, format, level unit. Analyr input configuration: Whether to add a preamplifier or not. Beats set up beat frequency setting, measuring CTB, CSO frequency (frequency offset CTB FRQ offset, CSO FRQ offset). Whether GATING YES NO passes the test line or not. C/N setup carrier-to-noise ratio setting: frequency point (frequency offset C/N FRQ offset), bandwidth.
The principle of spectrum analyzer extending input signal frequency by local oscillating harmonic signal can be realized. However, it may correspond to multiple input signal frequencies. To eliminate this phenomenon, a frequency preselector is added in front of the attenuator to enhance the dynamic range of the spectrum analyzer, while the output results can eliminate other unnecessary frequencies and truly reflect the frequency of the input signal.