​Programmable DC power supplies is also called DC stabilized power supply. Its service voltage is mostly alternating voltage, when the alternating current or output load resistance change, the direct output voltage of the voltage stabilizer can still keep stable.

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​Programmable DC power supply can protects itself by warning and cutting off output once the controlling module gets faults, transistor over-heating, and internal bus gets faults.

​The signal generator has the function of signal modulation. What is the signal modulation? The signal modulation refers to the in the modulating signal, frequency change inset the LF signal into the HF carrier signal.

The signal generator is also called signal source or oscillator, which is widely used in the production practice and science and technology field. Various waveform curve can be represented by trigonometric function equation. It can also generate many waveform, such as triangular wave, sawtooth wave, rectangular wave, sine wave, etc.

Spectrum analyzer is used to study signal distortion, modulation, spectral purity, frequency measurement stability and inter modulation distortion signal parameters.