Equipment List
1. High precision digital voltmeter (I use FLUKE 179);
2. High-precision audio signal sounder (I use Hangzhou Aihua AWA1650, or software with sound card);
3. High-precision automatic digital distortion measuring instrument (I use Changzhou Zhongce ZC4116, or other brands with this measurement function);
4. High power digital regulated power supply;
5. High precision and high power linear load resistance;
Measuring step method
Connect the measuring power amplifier to the output of the high-power regulated power supply, and adjust the output voltage to stabilize at 220V. If the input voltage of the power amplifier is a special requirement, it needs to be adjusted to the required voltage. This is the basis for measuring the accurate parameters and must be strictly implemented. It is very important. (The power of the regulated power supply is greater than 30% of the power consumption of the power supply when the dual-channel drive 4 ohm linear load is fully loaded.)
Connect a high-power linear load resistor to the power output of the amplifier. (Select the standard 4 ohm or 8 ohm linear load according to the required measurement parameters. Note! Connect the wire diameter and length, select the connecting wire with short diameter and long length as much as possible, and reduce the resistance of the connection position as much as possible. Numerical accuracy!)
Connect the audio signal generator to the amplifier signal input. (Need to adjust the voltage gain of the amplifier to the maximum value, turn off all output protection settings of the amplifier, such as limiter, high and low pass, DSP processing, etc. Otherwise it will affect the accuracy of the measured value!)
The detection line of the high-precision fully automatic digital distortion measuring instrument is connected in parallel to both ends of the linear load. (Turn on the meter and select to fully measure the total harmonic distortion position. The connection position is firm and stable.)
The high-precision digital voltmeter detects the alligator clips in parallel to the ends of the linear load. (Turn on the voltmeter and adjust to the full-scale AC voltage position. The connection position is firm and stable).
Send a 1KHz sine wave through the signal generator, slowly increase the output voltage. When the voltmeter displays the voltage value corresponding to 1W power, observe the total harmonic reading, which is the total harmonic distortion in the 1W state. Continue to increase the output voltage and observe the maximum output voltage reading with the total harmonic reading within 0.1%. After calculation, the maximum output power within 0.1% of the total harmonic distortion can be calculated. (It is necessary to observe whether the input voltage of the power amplifier meets 220V or special requirements, otherwise the measurement parameters will lose accuracy and the deviation is large).
It is worth noting that:
The quality of the measuring device determines the accuracy of the measured values.
The measurement must use two channels to simultaneously drive the linear load, and the output power needs to be synchronized.
To quickly measure two-channel parameters, two channels need to be performed simultaneously, and two sets of measuring equipment are required.
Consistent specification of operational details is the basis for ensuring fair and equitable measurement results.
The auxiliary digital filtering of the automatic digital distortion measuring instrument is selected in the range of 400Hz-30KHz.
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