GX2BB2 RF power meter

1Overview Describe

GX2BBThe series RF power meter is a microwave power measurement instrument that can measure continuous wave digital power meters.GX2BBThe series RF power meter consists of a power indicator and a power sensor. The external dimensions of its indicator part are250mm×155mm×290mm（b×h×d），GX2BB series RFPower meterThe display section isLEDThe display screen and front panel buttons are made of conductive rubber technology, and their control methods are all based on button menu operation. The rear panel is equipped with power input sockets andUser selectionRS232Interface and Recorder Interface.To achieve transportation control or to form a measurement system together with other instruments,The power meter sensor is composed of a microwave diode and corresponding sensing circuit.

two、technical parameter

2．1 Frequency range:50MHz～12.4GHz

2．2 Power measurement range:1μW～100mW(Basic type)

0.1μw～1W（GX2BB1）

0.1μw～2W（GX2BB2）

0.1μw～3W（GX2BB3）

0.1μw～5W（GX2BB5）

0.1μw～10W（GX2BB10）

0.1μw～20W（GX2BB20）

0.1μw～25W（GX2BB25）

0.1μw～30W（GX2BB30）

0.1μw～50W（GX2BB50）

0.1μw～100W（GX2BB100）

0.1μw～150W（GX2BB150）

0.1μw～200W（GX2BB200）

0.1μw～300W（GX2BB300）

0.1μw～500W（GX2BB500）

0.1μw～700W（GX2BB700）

0.1μw～1000W（GX2BB1000）

2．3 Measurement accuracy: working error ±0.5dB(Full value) ±1One word

2．4 Voltage standing wave ratio:S≤1.5

2．5 The average acceptable power is:1Minute excess power test.

2．6 Power benchmark:50MHz 1.00mW±1.5%

2．7 Noise drift:Within any minute interval ±(0.1uW+1word)

2．8 Recorder output: 0～1VVoltage, output impedance1KΩ.

2．9 Display mode:W、mwMethod,dBmMethod anddBMethod.

2．10 Power supply: AC mains power~220V，50Hz，20W

2．11 Host dimensions:250mm(wide)×155mm(high)×290(deep)mm（b×h×d）.

2．12 Weight:3Kg.

three、Function of regulating control mechanism(See instruction manual)

4working principle(See instruction manual for details)

4.1 GX2BBRF power meterPrinciple Block Diagram

4.2 Principles of each unit circuit

aPower sensing circuit

The power meter sensing circuit is composed of a chopper and a linear correction circuit. The chopper is designed with high sensitivity and low noiseMOS—FETA series chopper composed of switching tubes. Its function is to modulate the DC signal input through the power probe into an equivalent AC signal, which is more convenient for the processing of the subsequent amplification circuit. The linear correction circuit is composed of a spreadsheet that stores sensor parameters and is passed throughCPUThe processing was carried out.

bPre amplifier

A preamplifier is a hybrid amplifier composed of high gain transistors and high impedance, low barrier operational amplifiers. The AC gain of this amplifier is approximately600It utilizes the low noise of transistors and the high gain of operational amplifiers.

c.Attenuation network and main amplifier

The attenuation network is composed of analog switches and resistors, and is controlled by a central processing unit. It determines the range conversion. The main amplifier is mainly composed of programmable gain amplifiers, which can be adjusted to the appropriate gain under the control of the central processing unit.

dAmplification network and analog-to-digital converter

The amplification network is composed of high impedance and low barrier operational amplifiers, respectivelyX1、X10andX100Amplify the network and generate signals of three different ranges. Three signals enter the multi-channel, high-speed analog-to-digital converter simultaneously, and the central processor reads the corresponding data according to different ranges.

eZero network adjustment

Zeroing network is composed of digital to analog converters and corresponding devices. When the instrument is performing a zero adjustment operation, the data read from the analog-to-digital converter by the central processing unit is analyzed accordingly and the digital to analog converter provides the opposite signal to cancel out the zero point error in the circuit and achieve the zero adjustment effect.

fChopper driver

Signal supply to chopper220HzSquare waves amplify current.

gRecorder output circuit and meter drive circuit

The output circuit of the recorder and the driving circuit of the electric meter are composed of digital to analog converters and corresponding operational amplifiers. The central processing unit drives this part of the circuit based on the results of each measurement.

h.Central Processing Unit

The central processing unit adopts high-performance technology8bitmicroprocessor. It manages the operation of the entire instrument.

i.Panel Circuit

The panel circuit is composed ofLEDComposed of a display window and a user keyboard. It is the main tool for human-machine dialogue during manual operation.

j. 50MHzReference source

provide50MHz,1mWThe power reference signal. When the sensor is connected to50MHzAfter the reference source, the instrument can be calibrated through the "calibration" operation1mWcorrecting.

Wuusage method(See instruction manual)

7GX2BBradio frequencyPower meterRS-232Serial communication method(choose）(See instruction manual for details)

GX2BB RFThe power meter is connected to the rear panel throughRS-232The serial interface (as shown in the figure) can provide remote control for users. Users use computers or other controllers toRS-232Using serial interfaceGX2BBPower meter. Below is the information about this instrumentRS-232Connection method and data input of serial interface/Provide a detailed explanation of the output format and usage methods.

GX2BB RFPower meterThe remote control method adoptsRS-232Serial interface asDTEDevices.RS-232use8Bit data1A starting position1The format includes a termination bit and no checksum, and the baud rate can be set through the front panel of the instrument300、600、1200、2400、4800、9600and19200One of them, the default baud rate set by the instrument is9600The output interface adoptsDtype9Pin socket,The connection method is to simplify the connection form. The socket'spin2byRx；pin3byTx；pin5byGND.

7.6Example of Communication Process

Here are some examples of communication.

① power measurement

The initial working mode of the instrument isWATTMethod demonstration.

surface3

② Number setting

Set the frequency of the instrument to2GHzThe attenuation amount is set to30.0dBThe current working mode of the instrument isWATTMethod.

surface4

(If you need a detailed technical manual for the product, please send it upon request)

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