2018-06-07 RF test 1 ：TX Power test
Test item：
1.Output power：
The radio circuitry, generally referred to as the Device Under Test (DUT) and the spectrum analyzer are connected with a coaxial or COAX cable. The spectrum analyzer must cover the frequency range you want to measure. The frequency range depends on the operation frequency of the radio you want to measure.
• Center frequency: Equal to the RF frequency configured in the DUT.
中心频率一般与TX模块谐振频率决定，如433.92M，820Mhz，920MhZ，2.4G 等
• Frequency span: 1-10 MHz (depending on the DUT).
频带宽度由频率偏移量决定，选的越小，测量范围越窄，数据越集中准确。
• Amplitude: Must be set higher than the maximum output power of the DUT.
幅值由TX功率决定，要设置一定的余量，因为功率会因个体而有差异，Power会显著影响功率
• Resolution Bandwidth (RBW): 30kHz- 300kHz depending on the frequency span used. Generally,
设置为Outo可自动适应，
it is best to set the spectrum analyzer RBW to auto so that it follows the span.
Note：
1 射频产品要等常温冷却后测量。
Rf products should be measured at room temperature before test。
2 同轴线不能出现开裂，折断等不良。
高于2.4G 选用 SMA COAX
低于2.4G用BNC COAX
3屏蔽房不能带入通信产品，不能打开门窗。
The shielding room is not allowed to bring in the RF products,forbited to open the door and Windows.
4 必须针对一批样品进行10X10测量，以获取足够数据，用于确定最低-最高功率范围。
确定一个 “Strong enough power”
A «strong enough» signal is not easy to define precisely. This is because it depends on a lot of factors, such as the distance of measurement, the antenna on the spectrum analyser, the angle of the antenna on the spectrum analyser, the angle of the control unit’s antenna related to the other antenna, the room/shielded space the measurement is performed in, etc.
We suggest that you make a reference measurement in your test setup with a control unit with radio that you know works ok, and then use this reference (measured in dBm) as the standard that the measured radio signal must match to pass the test. To know that your reference card is ok, you can e.g. test radio communication with this over a certain distance。
5针对不同的RF电路，需要寻找影响其功率的因素。
通常需要取上中下三个等级各3pcs做重复性测试。
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