1. RF power meter, the instrument is operated by buttons. Advantages: simple structure, convenient use, stable performance, reliability, high sensitivity and fast measurement speed. 2. Add different RF attenuators, the user sets the relevant attenuation value, and the RF power meter can read the correct power parameters. 3.dB is a counting unit, if used in power, dB = 10*lg(). Use it for voltage or current, dB = 20*lg(). dB is used to simply and briefly display very or very small numbers(for example: a number with many 0's like 10000000.... or 0.00000001). example: X=1000000000000000 (15 x 0) can be displayed as 10lgX= 150dB X=0.000000000000001 (15 x 0)can be displayed as 10lgX= -150dB dBm is used to define milliwatts, 0 dBm=1mW dBw is used to determine Watts, 0 dBW = 10lg1 W = 10lg1000 mw = 30 dBm 4. Whether in of process control or signal processing, dB is usually used to define the power unit and counted in units of 101g. Although in some cases signal amplitude is used to describe power, in these cases it is measured in units of 201g. 5.Power measurement range: -50~+0 dBm (can be extended to 100dBm with RF attenuator), Power measurement accuracy: 0.1dBm, Frequency measurement range: 1MHz~10000 MHz, input impedance: 50, Power measurement range: 1nW~1mW, Working power supply: 7-12VDC, Working current: Less than 50mA, Working temperature: -10~55, Storage temperature: -20~70, Humidity 85%: R.H. non-condensing, Unit description: dbm; Button Description: Fun: function key; mode: configuration interface; sel: auto-increase key or auto-decrease key; Measurement data display Show source interface: The first line "RF-POW -51.2dbm" The second line "610uv 7nw" Note: The signal dbm value, input voltage value and input power are displayed separately. Set the RF power attenuation valueShow source interface: Line 1 "RF Attenuator" The second line "sub 000db" Key operation: Fun: function key; (by selecting positive and negative directions) display sub means subtraction, add means addition. (Long press fun to save the set db value) Sel: Automatic key plus or auto minus key; Note: Only by connecting different RF power attenuators and setting corresponding attenuation coefficients can the correct power parameters be read. Wiring P1 wiring definition: No. Symbol Meaning 1 positive module power supply (7v 12 12v) 2 module ground power P2 wiring definition: No. Symbol Meaning 1 unused FX 2 rf radio frequency input signal 3 GND Negative pole of power supply Colour:green Material:ABS Size:8 x 4.5 x 2.5cm Package Contents: 1 x HR363 RF Power Meter 1 x Chinese and English manual Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.