A power amplifier ("power amplifier") is an amplifier that produces a maximum power output to drive a load at a given distortion rate. The high voltage power amplifier is a very versatile test instrument, but how do you choose a suitable power amplifier?
The following indicators should be noted when selecting a high voltage power amplifier :
Bandwidth: Usually the manufacturer's amplifier bandwidth is defined by a sine wave. For example, the power amplifier 100KHz refers to the sine wave signal, the highest frequency that can be achieved, not the square wave or triangle wave. These waveforms are affected by their higher harmonics. Can not be reached, usually manufacturers will give small signal bandwidth or large signal bandwidth, customers need to communicate with manufacturers according to their own applications.
Voltage: The highest voltage value of the signal needs to be amplified. Customers should usually pay attention to whether the voltage required for their test application is the effective value Vrms or the peak-to-peak value Vpp. Generally, the manufacturer gives the peak-to-peak value.
Current: The power output of the power amplifier is usually constant, so that P=U*I, that is, the voltage and current are inversely proportional to the constant power. Usually, the current value given by the manufacturer is the maximum value, especially when under DC. When the voltage output is at its maximum, the current must be minimal.
Power: Power represents the drive capability of the amplifier, P = U * I, usually the power selection is related to the voltage and current on the device that the customer expects to load and the device under test, but if the load is pure resistive load is convenient to calculate, if It is a capacitive or inductive load that requires the customer to communicate with the manufacturer's engineers to obtain an accurate demand after performing certain simulations.
Channel: According to the application of the test, the number of channels is selected. At present, the mainstream of the manufacturer is single channel or dual channel. However, some manufacturers can customize the channel according to the user's needs, and can reach up to 8 channels. At the same time, the channel synchronization can be guaranteed, and different phases can be output. The poor signal is convenient for the user.
Gain?: Divided into analog gain and digital gain, analog gain is adjusted by potentiometer, analog gain can not be accurately amplified, can be read by external observation oscilloscope, gradually eliminated by the manufacturer, digital gain control, high adjustment precision, intuitive and convenient It is the gain amplification method adopted by mainstream amplifiers.
Input and output impedance matching: The amplifier is usually used with a signal source. Usually, the signal source has a 50 ohm and high-impedance output. The amplifier has a matching impedance at the input impedance to ensure the safety of the input. Output impedance matching requires a more flexible matching resistor due to the variety of customer-driven loads.
Protection: Since the power amplifier drives the load, many of them are dynamically changed, and higher requirements are imposed on the power amplifier. In order to prevent damage to the power amplifier, overvoltage protection, overcurrent protection, overheat protection, and short circuit protection are usually required.
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FAQ:
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Answer: We are a factory.
Question 2: Payment term?
Answer: 30% TT deposit + 70% TT before shipment,50% TT deposit + 50% LC balance, Flexible payment
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